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node-jscs

Build Status Coverage Status Dependency Status devDependency Status

JSCS — JavaScript Code Style.

jscs is a code style checker. You can configure jscs for your project in detail using over 60 validation rules, including presets from popular style guides like jQuery.

This is a documentation for the development version, please refer to the https://www.npmjs.org/package/jscs instead

Table of Contents

Presets

Friendly packages

Extensions

Installation

jscs can be installed using npm:

npm install jscs -g

To run jscs, you can use the following command from the project root:

jscs path[ path[...]]

You can also pipe input into jscs:

cat myfile.js | jscs

CLI

--config

Allows to define path to the config file.

jscs path[ path[...]] --config=./.config.json

If there is no --config option specified, jscs it will consequentially search for jscsConfig option in package.json file then for .jscsrc (which is a just JSON with comments) and .jscs.json files in the current working directory then in nearest ancestor until it hits the system root.

--preset

If defined will use predefined rules for specific code style.

jscs path[ path[...]] --preset=jquery

--reporter

jscs itself provides six reporters: checkstyle, console, inline, junit and text.

jscs path[ path[...]] --reporter=console

But you also can specify your own reporter, since this flag accepts relative or absolute paths too.

jscs path[ path[...]] --reporter=./some-dir/my-reporter.js

--esnext

Attempts to parse your code as ES6 using the harmony version of the esprima parser. Please note that this is currently experimental, and will improve over time.

--no-colors

Clean output without colors.

--max-errors

Set the maximum number of errors to report

--help

Outputs usage information.

--verbose

Prepends the name of the offending rule to all error messages.

--version

Outputs version of jscs.

Options

additionalRules

Path to load additional rules

Type: Array

Values: Array of file matching patterns

Example

"additionalRules": ["project-rules/*.js"]

preset

Extends defined rules with preset rules.

Type: String

Values: "airbnb", "crockford", "google", "jquery", "mdcs", "wikimedia", "yandex"

Example

"preset": "jquery"

If you want specifically disable preset rule assign it to null, like so:

{
    "preset": "jquery",
    "requireCurlyBraces": null
}

excludeFiles

Disables style checking for specified paths.

Type: Array

Values: Array of file matching patterns

Example

"excludeFiles": ["node_modules/**"]

fileExtensions

Changes the set of file extensions that will be processed.

Type: Array or String or "*"

Values: A single file extension or an Array of file extensions, beginning with a .. The matching is case insensitive. If "*" is provided, all files regardless of extension will match.

Example

"fileExtensions": [".js", ".jsx"]

Default

"fileExtensions": [".js"]

maxErrors

Set the maximum number of errors to report

Type: Number

Default: Infinity

Example

"maxErrors": 10

esnext

Attempts to parse your code as ES6 using the harmony version of the esprima parser.

Type: Boolean

Value: true

Example

"esnext": true

Error Suppression

Inline Comments

You can disable and reenable rules inline with two special comments: // jscs:disable and // jscs:enable. Spacing in these comments is fairly lenient. All of the following are equivalent:

/* jscs: enable */
// jscs: enable

You can use them to disable rules in several ways.

Disabling All Rules

Simply using // jscs:disable or // jscs:enable will disable all rules.

var a = b;
// jscs:disable
var c = d; // all errors on this line will be ignored
// jscs:enable
var e = f; // all errors on this line will be reported

Disabling Specific Rules

Including a comma separated list of rules to modify after // jscs:disable or // jscs:enable will modify only those rules.

// jscs:disable requireCurlyBraces
if (x) y(); // all errors from requireCurlyBraces on this line will be ignored
// jscs:enable requireCurlyBraces
if (z) a(); // all errors, including from requireCurlyBraces, on this line will be reported

You can enable all rules after disabling a specific rule, and that rule becomes reenabled as well.

// jscs:disable requireCurlyBraces
if (x) y(); // all errors from requireCurlyBraces on this line will be ignored
// jscs:enable
if (z) a(); // all errors, even from requireCurlyBraces, will be reported

You can disable multiple rules at once and progressively reeanble them.

// jscs:disable requireCurlyBraces, requireDotNotation
if (x['a']) y(); // all errors from requireCurlyBraces OR requireDotNotation on this line will be ignored
// jscs:enable requireCurlyBraces
if (z['a']) a(); // all errors from requireDotNotation, but not requireCurlyBraces, will be ignored
// jscs:enable requireDotNotation
if (z['a']) a(); // all errors will be reported

Versioning & Semver

We recommend installing JSCS via NPM using ^, or ~ if you want more stable releases.

Semver (http://semver.org/) dictates that breaking changes be major version bumps. In the context of a linting tool, a bug fix that causes more errors to be reported can be interpreted as a breaking change. However, that would require major version bumps to occur more often than can be desirable. Therefore, as a compromise, we will only release bug fixes that cause more errors to be reported in minor versions.

Below you fill find our versioning strategy, and what you can expect to come out of a new JSCS release.

  • Patch release:
    • A bug fix in a rule that causes JSCS to report less errors.
    • Docs, refactoring and other "invisible" changes for user;
  • Minor release:
    • Any preset changes.
    • A bug fix in a rule that causes JSCS to report more errors.
    • New rules or new options for existing rules that don't change existing behavior.
    • Modifying rules so they report less errors, and don't cause build failures.
  • Major release:
    • Purposefully modifying existing rules so that they report more errors or change the meaning of a rule.
    • Any architectural changes that could cause builds to fail.

Rules

requireCurlyBraces

Requires curly braces after statements.

Type: Array or Boolean

Values: Array of quoted keywords or true to require curly braces after the following keywords:

JSHint: curly

Example

"requireCurlyBraces": [
    "if",
    "else",
    "for",
    "while",
    "do",
    "try",
    "catch",
    "case",
    "default"
]
Valid
if (x) {
    x++;
}
Invalid
if (x) x++;

requireSpaceBeforeKeywords

Requires space before keyword.

Type: Array or Boolean

Values: Array of quoted keywords or true to require all possible keywords to have a preceding space.

Example

"requireSpaceBeforeKeywords": [
    "else",
    "while",
    "catch"
]
Valid
} else {
    x++;
}
Invalid
}else {
    x++;
}

requireSpaceAfterKeywords

Requires space after keyword.

Type: Array or Boolean

Values: Array of quoted keywords or true to require all of the keywords below to have a space afterward.

Example

"requireSpaceAfterKeywords": [
    "do",
    "for",
    "if",
    "else",
    "switch",
    "case",
    "try",
    "catch",
    "void",
    "while",
    "with",
    "return",
    "typeof",
    "function"
]
Valid
return true;
Invalid
if(x) {
    x++;
}

disallowSpaceAfterKeywords

Disallows space after keyword.

Type: Array or Boolean

Values: Array of quoted keywords or true to disallow spaces after all possible keywords.

Example

"disallowSpaceAfterKeywords": [
    "if",
    "else",
    "for",
    "while",
    "do",
    "switch",
    "try",
    "catch"
]
Valid
if(x > y) {
    y++;
}

disallowSpaceBeforeKeywords

Disallows space before keyword.

Type: Array or Boolean

Values: Array of quoted keywords or true to disallow spaces before all possible keywords.

Example

"disallowSpaceBeforeKeywords": [
    "else",
    "catch"
]
Valid
}else {
    y--;
}
Invalid
} else {
    y--;
}

requireSpaceBeforeBlockStatements

Requires space before block statements (for loops, control structures).

Type: Boolean

Values: true

Example

"requireSpaceBeforeBlockStatements": true
Valid
if (cond) {
  foo();
}

for (var e in elements) {
  bar(e);
}

while (cond) {
  foo();
}
Invalid
if (cond){
  foo();
}

for (var e in elements){
  bar(e);
}

while (cond){
  foo();
}

disallowSpaceBeforeBlockStatements

Disallows space before block statements (for loops, control structures).

Type: Boolean

Values: true

Example

"disallowSpaceBeforeBlockStatements": true
Valid
if (cond){
  foo();
}

for (var e in elements){
  bar(e);
}

while (cond){
  foo();
}
Invalid
if (cond) {
  foo();
}

for (var e in elements) {
  bar(e);
}

while (cond) {
  foo();
}

requireParenthesesAroundIIFE

Requires parentheses around immediately invoked function expressions.

Type: Boolean

Values: true

JSHint: immed

Example

"requireParenthesesAroundIIFE": true
Valid
var a = (function(){ return 1; })();
var b = (function(){ return 2; }());
var c = (function(){ return 3; }).call(this, arg1);
var d = (function(){ return 3; }.call(this, arg1));
var e = (function(){ return d; }).apply(this, args);
var f = (function(){ return d; }.apply(this, args));
Invalid
var a = function(){ return 1; }();
var c = function(){ return 3; }.call(this, arg1);
var d = function(){ return d; }.apply(this, args);

requireSpacesInConditionalExpression

Requires space before and/or after ? or : in conditional expressions.

Type: Object or Boolean

Values: "afterTest", "beforeConsequent", "afterConsequent", "beforeAlternate" as child properties, or true to set all properties to true. Child properties must be set to true.

Example

"requireSpacesInConditionalExpression": {
    "afterTest": true,
    "beforeConsequent": true,
    "afterConsequent": true,
    "beforeAlternate": true
}
Valid
var a = b ? c : d;
var a= b ? c : d;
Invalid
var a = b? c : d;
var a = b ?c : d;
var a = b ? c: d;
var a = b ? c :d;

disallowSpacesInConditionalExpression

Disallows space before and/or after ? or : in conditional expressions.

Type: Object or Boolean

Values: "afterTest", "beforeConsequent", "afterConsequent", "beforeAlternate" as child properties, or true to set all properties to true. Child properties must be set to true.

Example

"disallowSpacesInConditionalExpression": {
    "afterTest": true,
    "beforeConsequent": true,
    "afterConsequent": true,
    "beforeAlternate": true
}
Valid
var a = b?c:d;
var a= b?c:d;
Invalid
var a = b ?c:d;
var a = b? c:d;
var a = b?c :d;
var a = b?c: d;

requireSpacesInFunctionExpression

Requires space before () or {} in function expressions (both named and anonymous).

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"requireSpacesInFunctionExpression": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function () {}
function a () {}
Invalid
function() {}
function (){}

disallowSpacesInFunctionExpression

Disallows space before () or {} in function expressions (both named and anonymous).

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"disallowSpacesInFunctionExpression": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function(){}
function a(){}
Invalid
function () {}
function a (){}

requireSpacesInAnonymousFunctionExpression

Requires space before () or {} in anonymous function expressions.

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"requireSpacesInAnonymousFunctionExpression": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function () {}
Invalid
function() {}
function (){}

disallowSpacesInAnonymousFunctionExpression

Disallows space before () or {} in anonymous function expressions.

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"disallowSpacesInAnonymousFunctionExpression": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function(){}
Invalid
function () {}
function (){}

requireSpacesInNamedFunctionExpression

Requires space before () or {} in named function expressions.

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"requireSpacesInNamedFunctionExpression": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
var x = function a () {}
Invalid
var x = function a() {}
var x = function a(){}

disallowSpacesInNamedFunctionExpression

Disallows space before () or {} in named function expressions.

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"disallowSpacesInNamedFunctionExpression": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function a(){}
Invalid
function a () {}
function a (){}

requireSpacesInFunctionDeclaration

Requires space before () or {} in function declarations.

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"requireSpacesInFunctionDeclaration": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function a () {}
Invalid
function a() {}
function a (){}

disallowSpacesInFunctionDeclaration

Disallows space before () or {} in function declarations.

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"disallowSpacesInFunctionDeclaration": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function a(){}
Invalid
function a () {}
function a (){}

requireSpacesInFunction

Requires space before () or {} in function declarations and expressions.

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"requireSpacesInFunction": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function a () {}
Invalid
function a() {}
function a (){}

disallowSpacesInFunction

Disallows space before () or {} in function declarations and expressions.

Type: Object

Values: "beforeOpeningRoundBrace" and "beforeOpeningCurlyBrace" as child properties. Child properties must be set to true.

Example

"disallowSpacesInFunction": {
    "beforeOpeningRoundBrace": true,
    "beforeOpeningCurlyBrace": true
}
Valid
function a(){}
Invalid
function a () {}
function a (){}

requireSpacesInCallExpression

Requires space before () in call expressions.

Type: Boolean

Values: true

Example

"requireSpacesInCallExpression": true
Valid
var x = foobar ();
Invalid
var x = foobar();

disallowSpacesInCallExpression

Disallows space before () in call expressions.

Type: Boolean

Values: true

Example

"disallowSpacesInCallExpression": true
Valid
var x = foobar();
Invalid
var x = foobar ();

disallowMultipleVarDecl

Disallows multiple var declaration (except for-loop).

Type: Boolean or String

Values: true or 'strict' (to disallow multiple variable declarations within a for loop)

Example

"disallowMultipleVarDecl": true
Valid
var x = 1;
var y = 2;

for (var i = 0, j = arr.length; i < j; i++) {}
Invalid
var x = 1,
    y = 2;

requireMultipleVarDecl

Requires multiple var declaration.

Type: Boolean or String

Values: true or "onevar"

if requireMultipleVarDecl defined as a true value, it will report only consecutive vars, if, on the other hand, value equals to "onevar" string, requireMultipleVarDecl will allow only one var per function scope.

JSHint: onevar

Example

"requireMultipleVarDecl": true
Valid
var x = 1,
    y = 2;
Invalid
var x = 1;
var y = 2;

requireBlocksOnNewline

Requires blocks to begin and end with a newline

Type: Boolean or Integer

Values: true validates all non-empty blocks, Integer specifies a minimum number of statements in the block before validating.

Example

"requireBlocksOnNewline": true
Valid for mode true
if (true) {
    doSomething();
}
var abc = function() {};
Invalid
if (true) {doSomething();}
Valid for mode 1
if (true) {
    doSomething();
    doSomethingElse();
}
if (true) { doSomething(); }
var abc = function() {};
Invalid
if (true) { doSomething(); doSomethingElse(); }

requirePaddingNewlinesInBlocks

Requires blocks to begin and end with 2 newlines

Type: Boolean or Integer

Values: true validates all non-empty blocks, Integer specifies a minimum number of statements in the block before validating.

Example

"requirePaddingNewlinesInBlocks": true
Valid for mode true
if (true) {

    doSomething();

}
var abc = function() {};
Invalid
if (true) {doSomething();}
if (true) {
    doSomething();
}
Valid for mode 1
if (true) {

    doSomething();
    doSomethingElse();

}
if (true) {
    doSomething();
}
if (true) { doSomething(); }
var abc = function() {};
Invalid
if (true) { doSomething(); doSomethingElse(); }
if (true) {
    doSomething();
    doSomethingElse();
}

disallowPaddingNewlinesInBlocks

Disallows blocks from beginning and ending with 2 newlines.

Type: Boolean

Values: true validates all non-empty blocks.

Example

"disallowPaddingNewlinesInBlocks": true
Valid
if (true) {
    doSomething();
}
if (true) {doSomething();}
var abc = function() {};
Invalid
if (true) {

    doSomething();

}

requirePaddingNewLinesInObjects

Requires newline inside curly braces of all objects.

Type: Boolean

Values: true

Example

"requirePaddingNewLinesInObjects": true
Valid
var x = {
    a: 1
};
foo({
    a: {
        b: 1
    }
});
Invalid
var x = { a: 1 };
foo({a:{b:1}});

disallowPaddingNewLinesInObjects

Disallows newline inside curly braces of all objects.

Type: Boolean

Values: true

Example

"disallowPaddingNewLinesInObjects": true
Valid
var x = { a: 1 };
foo({a: {b: 1}});
Invalid
var x = {
    a: 1
};
foo({
    a: {
        b: 1
    }
});

disallowEmptyBlocks

Disallows empty blocks (except for catch blocks).

Type: Boolean

Values: true

JSHint: noempty

Example

"disallowEmptyBlocks": true
Valid
if ( a == b ) { c = d; }
try { a = b; } catch( e ){}
Invalid
if ( a == b ) { } else { c = d; }

disallowSpacesInsideObjectBrackets

Disallows space after opening object curly brace and before closing.

Type: Boolean or String

Values: "all" or true for strict mode, "nested" ignores closing brackets in a row.

Example

"disallowSpacesInsideObjectBrackets": "all"
Valid for mode "all"
var x = {a: {b: 1}};
Valid for mode "nested"
var x = { a: {b: 1} };
Invalid
var x = { a: { b: 1 } };

disallowSpacesInsideArrayBrackets

Disallows space after opening array square bracket and before closing.

Type: Boolean or String

Values: "all" or true for strict mode, "nested" ignores closing brackets in a row.

Example

"disallowSpacesInsideArrayBrackets": "all"
Valid for mode "all"
var x = [[1]];
Valid for mode "nested"
var x = [ [1] ];
Invalid
var x = [ [ 1 ] ];

disallowSpacesInsideParentheses

Disallows space after opening round bracket and before closing.

Type: Object or Boolean

Values: true or Object with either "only" with array of tokens or "all" with true value

Example

"disallowSpacesInsideParentheses": true
Valid for true value
var x = (1 + 2) * 3;
Valid for only value
"disallowSpacesInsideParentheses": { "only": [ "{", "}" ] }
var x = ( 1 + 2 );
var x = foo({});
Invalid
var x = foo( {} );

requireSpacesInsideObjectBrackets

Requires space after opening object curly brace and before closing.

Type: String

Values: "all" for strict mode, "allButNested" ignores closing brackets in a row.

Example

"requireSpacesInsideObjectBrackets": "all"
Valid for mode "all"
var x = { a: { b: 1 } };
Valid for mode "allButNested"
var x = { a: { b: 1 }};
Invalid
var x = {a: 1};

requireSpacesInsideArrayBrackets

Requires space after opening array square bracket and before closing.

Type: String

Values: "all" for strict mode, "allButNested" ignores closing brackets in a row.

Example

"requireSpacesInsideArrayBrackets": "all"
Valid for mode "all"
var x = [ 1 ];
Valid for mode "allButNested"
var x = [[ 1 ], [ 2 ]];
Invalid
var x = [1];

requireSpacesInsideParentheses

Requires space after opening round bracket and before closing.

Type: Object or String

Values: "all" for strict mode, "allButNested" (deprecated use "except": ['(', ')']) ignores nested brackets in a row, you could also specify token exceptions.

Example

"requireSpacesInsideParentheses": {
    "all": true,
    "except": [ "{", "}" ]
}
Valid for mode "all"
var x = Math.pow( ( 1 + 2 ), ( 3 + 4 ) );
Valid for mode "allButNested"
var x = Math.pow(( 1 + 2 ), ( 3 + 4 ));
Valid for mode "all" with except
var x = Math.pow( foo({ test: 1 }) );
Invalid
var x = Math.pow(1 + 2, 3 + 4);

disallowQuotedKeysInObjects

Disallows quoted keys in object if possible.

Type: String or Boolean

Values:

  • true for strict mode
  • "allButReserved" allows ES3+ reserved words to remain quoted which is helpful when using this option with JSHint's es3 flag.

Example

"disallowQuotedKeysInObjects": true
Valid for mode true
var x = { a: { default: 1 } };
Valid for mode "allButReserved"
var x = {a: 1, 'default': 2};
Invalid
var x = {'a': 1};

disallowDanglingUnderscores

Disallows identifiers that start or end in _, except for some popular exceptions:

  • _ (underscore.js)
  • __filename (node.js global)
  • __dirname (node.js global)
  • super_ (node.js, used by util.inherits)

Type: Boolean

Values: true

JSHint: nomen

Example

"disallowDanglingUnderscores": true
Valid
var x = 1;
var y = _.extend;
var z = __dirname;
var w = __filename;
var x_y = 1;
Invalid
var _x = 1;
var x_ = 1;
var x_y_ = 1;

disallowSpaceAfterObjectKeys

Disallows space after object keys.

Type: Boolean

Values: true

Example

"disallowSpaceAfterObjectKeys": true
Valid
var x = {a: 1};
Invalid
var x = {a : 1};

requireSpaceAfterObjectKeys

Requires space after object keys.

Type: Boolean

Values: true

Example

"requireSpaceAfterObjectKeys": true
Valid
var x = {a : 1};
Invalid
var x = {a: 1};

disallowSpaceBeforeObjectValues

Disallows space after object keys.

Type: Boolean

Values: true

Example

"disallowSpaceBeforeObjectValues": true
Valid
var x = {a:1};
Invalid
var x = {a: 1};

requireSpaceBeforeObjectValues

Requires space after object keys.

Type: Boolean

Values: true

Example

"requireSpaceBeforeObjectValues": true
Valid
var x = {a: 1};
Invalid
var x = {a:1};

disallowCommaBeforeLineBreak

Disallows commas as last token on a line in lists.

Type: Boolean

Values: true

JSHint: laxcomma

Example

"disallowCommaBeforeLineBreak": true
Valid
var x = {
    one: 1
    , two: 2
};
var y = { three: 3, four: 4};
Invalid
var x = {
    one: 1,
    two: 2
};

requireCommaBeforeLineBreak

Requires commas as last token on a line in lists.

Type: Boolean

Values: true

JSHint: laxcomma

Example

"requireCommaBeforeLineBreak": true
Valid
var x = {
    one: 1,
    two: 2
};
var y = { three: 3, four: 4};
Invalid
var x = {
    one: 1
    , two: 2
};

requireAlignedObjectValues

Requires proper alignment in object literals.

Type: String

Values:

  • "all" for strict mode,
  • "ignoreFunction" ignores objects if one of the property values is a function expression,
  • "ignoreLineBreak" ignores objects if there are line breaks between properties

Example

"requireAlignedObjectValues": "all"
Valid
var x = {
    a   : 1,
    bcd : 2,
    ef  : 'str'
};
Invalid
var x = {
    a : 1,
    bcd : 2,
    ef : 'str'
};

requireOperatorBeforeLineBreak

Requires operators to appear before line breaks and not after.

Type: Array or Boolean

Values: Array of quoted operators or true to require all possible binary operators to appear before line breaks

JSHint: laxbreak

Example

"requireOperatorBeforeLineBreak": [
    "?",
    "=",
    "+",
    "-",
    "/",
    "*",
    "==",
    "===",
    "!=",
    "!==",
    ">",
    ">=",
    "<",
    "<="
]
Valid
x = y ? 1 : 2;
x = y ?
    1 : 2;
Invalid
x = y
    ? 1 : 2;

disallowSpaceAfterPrefixUnaryOperators

Requires sticking unary operators to the right.

Type: Array or Boolean

Values: Array of quoted operators or true to disallow space after prefix for all unary operators

Example

"disallowSpaceAfterPrefixUnaryOperators": ["++", "--", "+", "-", "~", "!"]
Valid
x = !y; y = ++z;
Invalid
x = ! y; y = ++ z;

requireSpaceAfterPrefixUnaryOperators

Disallows sticking unary operators to the right.

Type: Array or Boolean

Values: Array of quoted operators or true to require space after prefix for all unary operators

Example

"requireSpaceAfterPrefixUnaryOperators": ["++", "--", "+", "-", "~", "!"]
Valid
x = ! y; y = ++ z;
Invalid
x = !y; y = ++z;

disallowSpaceBeforePostfixUnaryOperators

Requires sticking unary operators to the left.

Type: Array or Boolean

Values: Array of quoted operators or true to disallow space before postfix for all unary operators (i.e. increment/decrement operators)

Example

"disallowSpaceBeforePostfixUnaryOperators": ["++", "--"]
Valid
x = y++; y = z--;
Invalid
x = y ++; y = z --;

requireSpaceBeforePostfixUnaryOperators

Disallows sticking unary operators to the left.

Type: Array or Boolean

Values: Array of quoted operators or true to require space before postfix for all unary operators (i.e. increment/decrement operators)

Example

"requireSpaceBeforePostfixUnaryOperators": ["++", "--"]
Valid
x = y ++; y = z --;
Invalid
x = y++; y = z--;

disallowSpaceBeforeBinaryOperators

Requires sticking binary operators to the left.

Type: Array or Boolean

Values: Array of quoted operators or true to disallow space before all possible binary operators

Example

"disallowSpaceBeforeBinaryOperators": [
    "=",
    ",",
    "+",
    "-",
    "/",
    "*",
    "==",
    "===",
    "!=",
    "!=="
    // etc
]
Valid
x+ y;
Invalid
x + y;

requireSpaceBeforeBinaryOperators

Disallows sticking binary operators to the left.

Type: Array or Boolean

Values: Array of quoted operators or true to require space before all possible binary operators without comma operator, since it's rarely used with this rule

Example

"requireSpaceBeforeBinaryOperators": [
    "=",
    ",",
    "+",
    "-",
    "/",
    "*",
    "==",
    "===",
    "!=",
    "!=="
    // etc
]
Valid
x !== y;
Invalid
x!== y;

disallowSpaceAfterBinaryOperators

Requires sticking binary operators to the right.

Type: Array or Boolean

Values: Array of quoted operators or true to disallow space after all possible binary operators

Example

"disallowSpaceAfterBinaryOperators": [
    "=",
    ",",
    "+",
    "-",
    "/",
    "*",
    "==",
    "===",
    "!=",
    "!=="
    // etc
]
Valid
x +y;
Invalid
x+ y;

requireSpaceAfterBinaryOperators

Disallows sticking binary operators to the right.

Type: Array or Boolean

Values: Array of quoted operators or true to require space after all possible binary operators

Example

"requireSpaceAfterBinaryOperators": [
    "=",
    ",",
    "+",
    "-",
    "/",
    "*",
    "==",
    "===",
    "!=",
    "!=="
    // etc
]
Valid
x + y;
Invalid
x +y;

disallowImplicitTypeConversion

Disallows implicit type conversion.

Type: Array

Values: Array of quoted types

Example

"disallowImplicitTypeConversion": ["numeric", "boolean", "binary", "string"]
Valid
x = Boolean(y);
x = Number(y);
x = String(y);
x = s.indexOf('.') !== -1;
Invalid
x = !!y;
x = +y;
x = '' + y;
x = ~s.indexOf('.');

requireCamelCaseOrUpperCaseIdentifiers

Requires identifiers to be camelCased or UPPERCASE_WITH_UNDERSCORES

Type: Boolean or String

Values: true or "ignoreProperties"

JSHint: camelcase

Example

"requireCamelCaseOrUpperCaseIdentifiers": true
Valid for mode true
var camelCase = 0;
var CamelCase = 1;
var _camelCase = 2;
var camelCase_ = 3;
var UPPER_CASE = 4;
Invalid for mode true
var lower_case = 1;
var Mixed_case = 2;
var mixed_Case = 3;
Valid for mode ignoreProperties
var camelCase = 0;
var CamelCase = 1;
var _camelCase = 2;
var camelCase_ = 3;
var UPPER_CASE = 4;
var obj.snake_case = 5;
var camelCase = { snake_case: 6 };
Invalid for mode ignoreProperties
var lower_case = 1;
var Mixed_case = 2;
var mixed_Case = 3;
var snake_case = { snake_case: 6 };

disallowKeywords

Disallows usage of specified keywords.

Type: Array

Values: Array of quoted keywords

Example

"disallowKeywords": ["with"]
Invalid
with (x) {
    prop++;
}

disallowMultipleLineStrings

Disallows strings that span multiple lines without using concatenation.

Type: Boolean

Values: true

JSHint: multistr

Example

"disallowMultipleLineStrings": true
Valid
var x = "multi" +
        "line";
var y = "single line";
Invalid
var x = "multi \
        line";

disallowMultipleLineBreaks

Disallows multiple blank lines in a row.

Type: Boolean

Values: true

Example

"disallowMultipleLineBreaks": true
Valid
var x = 1;

x++;
Invalid
var x = 1;


x++;

disallowMixedSpacesAndTabs

Requires lines to not contain both spaces and tabs consecutively, or spaces after tabs only for alignment if "smart"

Type: Boolean or String

Values: true or "smart"

JSHint: smarttabs

Example

"disallowMixedSpacesAndTabs": true
Valid example for mode true
\tvar foo = "blah blah";
\s\s\s\svar foo = "blah blah";
\t/**
\t\s*
\t\s*/ //a single space to align the star in a multi-line comment is allowed
Invalid example for mode true
\t\svar foo = "blah blah";
\s\tsvar foo = "blah blah";
Valid example for mode "smart"
\tvar foo = "blah blah";
\t\svar foo = "blah blah";
\s\s\s\svar foo = "blah blah";
\t/**
\t\s*
\t\s*/ //a single space to align the star in a multi-line comment is allowed
Invalid example for mode "smart"
\s\tsvar foo = "blah blah";

disallowTrailingWhitespace

Requires all lines to end on a non-whitespace character

Type: Boolean

Values: true

JSHint: trailing

Example

"disallowTrailingWhitespace": true
Valid
var foo = "blah blah";
Invalid
var foo = "blah blah"; //<-- whitespace character here

disallowTrailingComma

Disallows an extra comma following the final element of an array or object literal.

Type: Boolean

Values: true

JSHint: es3

Example

"disallowTrailingComma": true
Valid
var foo = [1, 2, 3];
var bar = {a: "a", b: "b"}
Invalid
var foo = [1, 2, 3, ];
var bar = {a: "a", b: "b", }

requireTrailingComma

Requires an extra comma following the final element of an array or object literal.

Type: Boolean or Object

Values:

  • true: validates all arrays and objects
  • Object:
    • ignoreSingleValue: allows single property objects and single element arrays to not require a trailing comma

Example

"requireTrailingComma": true
Valid
var foo = [1, 2, 3,];
var bar = {a: "a", b: "b",}
Valid with ignoreSingleValue
var car = [1];
var dar = {a: "a"};
Invalid
var foo = [1, 2, 3];
var bar = {a: "a", b: "b"}

disallowKeywordsOnNewLine

Disallows placing keywords on a new line.

Type: Array

Values: Array of quoted keywords

Example

"disallowKeywordsOnNewLine": ["else"]
Valid
if (x < 0) {
    x++;
} else {
    x--;
}
Invalid
if (x < 0) {
    x++;
}
else {
    x--;
}

requireKeywordsOnNewLine

Requires placing keywords on a new line.

Type: Array

Values: Array of quoted keywords

Example

"requireKeywordsOnNewLine": ["else"]
Valid
if (x < 0) {
    x++;
}
else {
    x--;
}
Invalid
if (x < 0) {
    x++;
} else {
    x--;
}

requireLineFeedAtFileEnd

Requires placing line feed at file end.

Type: Boolean

Values: true

Example

"requireLineFeedAtFileEnd": true

maximumLineLength

Requires all lines to be at most the number of characters specified

Type: Integer or Object

Values:

  • Integer: lines should be at most the number of characters specified
  • Object:
    • value: (required) lines should be at most the number of characters specified
    • tabSize: (default: 1) considered the tab character as number of specified spaces
    • allowComments: (default: false) allows comments to break the rule
    • allowUrlComments: (default: false) allows comments with long urls to break the rule
    • allowRegex: (default: false) allows regular expression literals to break the rule

JSHint: maxlen

Example

"maximumLineLength": 40
Valid
var aLineOf40Chars = 123456789012345678;
Invalid
var aLineOf41Chars = 1234567890123456789;

requireCapitalizedConstructors

Requires constructors to be capitalized (except for this)

Type: Boolean

Values: true

JSHint: newcap

Example

"requireCapitalizedConstructors": true
Valid
var a = new B();
var c = new this();
Invalid
var d = new e();

requireDotNotation

Requires member expressions to use dot notation when possible

Type: Boolean

Values: true

JSHint: sub

Example

"requireDotNotation": true
Valid
var a = b[c];
var a = b.c;
var a = b[c.d];
var a = b[1];
var a = b['while']; //reserved word
Invalid
var a = b['c'];

requireYodaConditions

Requires the variable to be the right hand operator when doing a boolean comparison

Type: Boolean

Values: true

Example

"requireYodaConditions": true
Valid
if (1 == a) {
  return
}
Invalid
if (a == 1) {
  return
}

disallowYodaConditions

Requires the variable to be the left hand operator when doing a boolean comparison

Type: Boolean

Values: true

Example

"disallowYodaConditions": true
Valid
if (a == 1) {
  return
}
Invalid
if (1 == a) {
  return
}

requireSpaceAfterLineComment

Requires that a line comment (//) be followed by a space.

Type: Boolean or Object or String

Values:

  • true
  • "allowSlash" (deprecated use "except": ["/"]) allows /// format
  • Object:
    • allExcept: array of allowed strings before space //(here)

Example

"requireSpaceAfterLineComment": { "allExcept": ["#", "="] }
Valid
// A comment
/*A comment*/
//# sourceURL=filename.js
//= require something
Invalid
//A comment

disallowSpaceAfterLineComment

Requires that a line comment (//) not be followed by a space.

Type: Boolean

Values: true

Example

"disallowSpaceAfterLineComment": true
Valid
//A comment
/* A comment*/
Invalid
// A comment

disallowAnonymousFunctions

Requires that a function expression be named.

Type: Boolean

Values: true

Example

"disallowAnonymousFunctions": true
Valid
var a = function foo(){

};

$('#foo').click(function bar(){

};)
Invalid
var a = function(){

};

$('#foo').click(function(){

};)

requireAnonymousFunctions

Requires that a function expression be anonymous.

Type: Boolean

Values: true

Example

"requireAnonymousFunctions": true
Valid
var a = function(){

};

$('#foo').click(function(){

};)
Invalid
var a = function foo(){

};

$('#foo').click(function bar(){

};)

disallowFunctionDeclarations

Disallows function declarations.

Type: Boolean

Values: true

Example

"disallowFunctionDeclarations": true
Valid
var expressed = function() {

};

var expressed = function deeply() {

};

$('#foo').click(function bar() {

};)
Invalid
function stated() {

}

requireFunctionDeclarations

Requires function declarations by disallowing assignment of functions expressions to variables. Function expressions are allowed in all other contexts, including when passed as function arguments or immediately invoked.

Assignment of function expressions to object members is also permitted, since these can't be declared.

Type: Boolean

Values: true

Example

"requireFunctionDeclarations": true
Valid
function declared() {

};

(function iife() {
    void 0;
})();

var obj = {
    a: function () {}
};

obj.b = function () { };

$('#foo').click(function bar() {

};)
Invalid
var expressed = function() {

};

var expressed = function deeply() {

};

disallowNewlineBeforeBlockStatements

Disallows newline before opening curly brace of all block statements.

Type: Boolean

Values: true

Example

"disallowNewlineBeforeBlockStatements": true
Valid
function good(){
    var obj = {
        val: true
    };

    return {
        data: obj
    };
}

if (cond){
    foo();
}

for (var e in elements){
    bar(e);
}

while (cond){
    foo();
}
Invalid
function bad()
{
    var obj =
    {
        val: true
    };

    return {
        data: obj
    };
}

if (cond)
{
    foo();
}

for (var e in elements)
{
    bar(e);
}

while (cond)
{
    foo();
}

requireNewlineBeforeBlockStatements

Requires newline before opening curly brace of all block statements.

Type: Boolean

Values: true

Example

"requireNewlineBeforeBlockStatements": true
Valid
function good()
{
    var obj =
    {
        val: true
    };

    return {
        data: obj
    };
}

if (cond)
{
    foo();
}

for (var e in elements)
{
    bar(e);
}

while (cond)
{
    foo();
}
Invalid
function bad(){
    var obj = {
        val: true
    };

    return {
        data: obj
    };
}

if (cond){
    foo();
}

for (var e in elements){
    bar(e);
}

while (cond){
    foo();
}

validateLineBreaks

Option to check line break characters

Type: String

Values: "CR", "LF", "CRLF"

Example

"validateLineBreaks": "LF"
Valid
var x = 1;<LF>
x++;
Invalid
var x = 1;<CRLF>
x++;

validateQuoteMarks

Requires all quote marks to be either the supplied value, or consistent if true

Type: String or Object

Values:

  • "\"": all strings require double quotes
  • "'": all strings require single quotes
  • true: all strings require the quote mark first encountered in the source code
  • Object:
    • escape: allow the "other" quote mark to be used, but only to avoid having to escape
    • mark: the same effect as the non-object values

JSHint: quotmark

Example

"validateQuoteMarks": "\""
"validateQuoteMarks": { "mark": "\"", "escape": true }
Valid example for mode { "mark": "\"", "escape": true }
var x = "x";
var y = '"x"';
Invalid example for mode { "mark": "\"", "escape": true }
var x = "x";
var y = 'x';
Valid example for mode "\"" or mode true
var x = "x";
Valid example for mode "'" or mode true
var x = 'x';
Invalid example for mode true
var x = "x", y = 'y';

validateIndentation

Validates indentation for switch statements and block statements

Type: Integer or String

Values: A positive integer or "\t"

JSHint: indent

Example

"validateIndentation": "\t"
Valid example for mode 2
if (a) {
  b=c;
  function(d) {
    e=f;
  }
}
Invalid example for mode 2
if (a) {
   b=c;
function(d) {
       e=f;
}
}
Valid example for mode "\t"
if (a) {
    b=c;
    function(d) {
        e=f;
    }
}
Invalid example for mode "\t"
if (a) {
     b=c;
function(d) {
           e=f;
 }
}

validateParameterSeparator

Enable validation of separators between function parameters.

Type: String

Values:

  • ", ": function parameters are immediately followed by a comma then a space
  • " ,": function parameters are immediately followed by a space then a comma
  • " , ": function parameters are immediately followed by a space, a comma then a space

Example

"validateParameterSeparator": ", "
Valid
function a(b, c) {}
Invalid
function a(b , c) {}

requireCapitalizedComments

Requires the first alphabetical character of a comment to be uppercase

Type: Boolean

Value: true

Example

requireCapitalizedComments: true

Valid:

// Valid
//Valid

/*
  Valid
 */

/**
 * Valid
 */

// 123 or any non-alphabetical starting character

Invalid:

// invalid
//invalid
/** invalid */
/**
 * invalid
 */

disallowCapitalizedComments

Requires the first alphabetical character of a comment to be lowercase.

Type: String

Value: true

Example

disallowCapitalizedComments: true

Valid:

// valid
//valid

/*
  valid
 */

/**
 * valid
 */

// 123 or any non-alphabetical starting character

Invalid:

// Invalid
//Invalid
/** Invalid */
/**
 * Invalid
 */

validateJSDoc

Please use the JSCS-JSDoc plugin instead.

safeContextKeyword

Option to check var that = this expressions

Type: Array or String

Values: String value used for context local declaration

Example

"safeContextKeyword": ["that"]
Valid
var that = this;
Invalid
var _this = this;

Removed Rules

disallowLeftStickedOperators

Use the following rules instead:

  • requireSpaceBeforeBinaryOperators
  • requireSpaceBeforePostfixUnaryOperators
  • requireSpacesInConditionalExpression

disallowRightStickedOperators

Use the following rules instead:

  • requireSpaceAfterBinaryOperators
  • requireSpaceAfterPrefixUnaryOperators
  • requireSpacesInConditionalExpression

requireLeftStickedOperators

Use the following rules instead:

  • disallowSpaceBeforeBinaryOperators
  • disallowSpaceBeforePostfixUnaryOperators
  • disallowSpacesInConditionalExpression

requireRightStickedOperators

Use the following rules instead:

  • disallowSpaceAfterBinaryOperators
  • disallowSpaceAfterPrefixUnaryOperators
  • disallowSpacesInConditionalExpression

Browser Usage

The npm package contains a file named jscs-browser.js (since version 1.5.7), which is a browser compatible version of jscs.

If you'd like to generate this file yourself, run npm run browserify after cloning this repo.

Use jscs-browser.js on your page as follows:

<script src="jscs-browser.js"></script>
<script>
    var checker = new JscsStringChecker();
    checker.registerDefaultRules();
    checker.configure({disallowMultipleVarDecl: true});
    var errors = checker.checkString('var x, y = 1;');
    errors.getErrorList().forEach(function(error) {
        console.log(errors.explainError(error));
    });
</script>

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JavaScript Code Style checker

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