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SiteOne Crawler

SiteOne Crawler is a very useful and easy-to-use website analyzer & cloner/exporter you'll ♥ as a Dev/DevOps, SEO specialist, QA engineer, website owner or consultant. Works on all popular platforms - Windows, macOS and Linux (x64 and arm64 too).

The main capability of the crawler is to generate a detailed HTML report with lots of useful information about your website (see sample nextjs.org report) and at the same time it can clone/export the website offline (see browsable nextjs.org clone).

It will crawl your entire website in depth, analyze and report problems, show useful statistics and reports, generate an offline version of the website, generate sitemaps or send reports via email. Watch a detailed video with a sample report for the astro.build website.

This crawler can be used as a command-line tool (see releases and video), or you can use a multi-platform desktop application with graphical interface (see video about app).

I also recommend looking at the project website crawler.siteone.io with detailed documentation.

GIF animation of the crawler in action (also available as a video):

SiteOne Crawler

Table of contents

Features

In short, the main benefits can be summarized in these points:

  • Crawler - very powerful crawler of the entire website reporting useful information about each URL (status code, response time, size, custom headers, titles, etc.)
  • Dev/DevOps assistant - offers a set of very useful and often necessary features for developers and devops (stress test, warm up cache, localhost testing, etc.)
  • Analyzer - analyzes all webpages and reports strange or error behaviour and useful statistics (404, redirects, bad practices, SEO and security issues, heading structures, etc.)
  • Reporter - sends a HTML report to your email addresses with all the information about the crawled website
  • Offline website generator - allows you to export the entire website to offline form, where it is possible to browse the site through local HTML files (without HTTP server) including all images, styles, scripts, fonts, etc.
  • Sitemap generator - allows you to generate sitemap.xml and sitemap.txt files with a list of all pages on your website

The following features are summarized in greater detail:

Crawler

  • all major platforms supported without complicated installation or dependencies (Linux, Windows, macOS, arm64)
  • has incredible C++ performance (thanks to Swoole's coroutines)
  • provide simulation of different device types (desktop/mobile/tablet) thanks to predefined User-Agents
  • will crawl all files, styles, scripts, fonts, images, documents, etc. on your website
  • will respect the robots.txt file and will not crawl the pages that are not allowed
  • has a beautiful interactive and colourful output
  • it will clearly warn you of any wrong use of the tool (e.g. input parameters validation or wrong permissions)
  • captures CTRL+C and ends with the statistics for at least the current processed URLs
  • as --url parameter, you can specify also a sitemap.xml file (or sitemap index), which will be processed as a list of URLs. Note: gzip pre-compressed sitemaps *.xml.gz are not supported.

Dev/DevOps assistant

  • allows testing public and local projects on specific ports (e.g. http://localhost:3000/)
  • will perform a stress test and allow you to test the protection of the infrastructure against DoS attacks
  • will help you warm up the application cache or the cache on the reverse proxy of the entire website

Analyzer

  • will find the weak points or strange behavior of your website
  • allows you to implement your own analyzers by simply adding an analyzer class that implements the Crawler\Analyzer interface.

Reporter

  • will provide you with data for SEO analysis, just add the Title, Keywords and Description
  • will send you a nice HTML report to your email addresses
  • will export the output to JSON, HTML or text for your integrations will provide useful summaries and statistics at the end of the processing

Offline website generator

  • will help you export the entire website to offline form, where it is possible to browse the site through local HTML files (without HTTP server) including all document, images, styles, scripts, fonts, etc.
  • you can limit what assets you want to download and export (see --disable-* directives) .. for some types of websites the best result is with the --disable-javascript option.
  • you can specify by --allowed-domain-for-external-files (short -adf) from which external domains it is possible to **download ** assets (JS, CSS, fonts, images, documents) including * option for all domains.
  • you can specify by --allowed-domain-for-crawling (short -adc) which other domains should be included in the crawling if there are any links pointing to them. You can enable e.g. mysite.* to export all language mutations that have a different TLD or *.mysite.tld to export all subdomains.
  • you can try ---disable-styles and ---disable-fonts and see how well you handle accessibility and semantics
  • you can use --single-page to export only one page to which the URL is given (and its assets), but do not follow other pages.
  • you can use --single-foreign-page to export only one page from another domain (if allowed by --allowed-domain-for-crawling), but do not follow other pages.
  • you can use --replace-content to replace content in HTML/JS/CSS with foo -> bar or regexp in PREG format, e.g. /card[0-9]/i -> card. Can be specified multiple times.
  • you can use --replace-query-string to replace chars in query string in the filename.
  • you can use --max-depth to set the maximum crawling depth (for pages, not assets). 1 means /about or /about/, 2 means /about/contacts etc.
  • you can use it to export your website to a static form and host it on GitHub Pages, Netlify, Vercel, etc. as a static backup and part of your disaster recovery plan or archival/legal needs
  • works great with older conventional websites but also modern ones, built on frameworks like Next.js, Nuxt.js, SvelteKit, Astro, Gatsby, etc. When a JS framework is detected, the export also performs some framework-specific code modifications for optimal results. For example, most frameworks can't handle the relative location of a project and linking assets from root /, which doesn't work with file:// mode.
  • try it for your website, and you will be very pleasantly surprised :-)
  • roadmap: we are also planning to release a version of the export compatible with Nginx that will preserve all original URLs for your website and allow you to host it on your own infrastructure.

Sitemap generator

  • will help you create a sitemap.xml and sitemap.xml for your website
  • you can set the priority of individual pages based on the number of slashes in the URL

Don't hesitate and try it. You will love it as we do! ♥

For active contributors

  • the crawler code provides some useful functionality that facilitates further development and extensibility of the project

Installation

Ready-to-use releases

You can download ready-to-use releases from GitHub releases for all major platforms (Linux, Windows, macOS, arm64).

Unpack the downloaded archive, and you will find the crawler or crawler.bat (Windows) executable binary and run crawler by ./crawler --url=https://my.domain.tld.

Note for Windows users: use Cygwin-based release *-win-x64.zip only if you can't use WSL (Ubuntu/Debian), what is recommended. If you really have to use the Cygwin version, set --workers=1 for higher stability.

Note for macOS users: In case that Mac refuses to start the crawler from your Download folder, move the entire folder with the Crawler via the terminal to another location, for example to the homefolder ~.

Linux (x64)

Most easily installation is on most Linux (x64) distributions.

git clone https://github.com/janreges/siteone-crawler.git
cd siteone-crawler

# run crawler with basic options
./crawler --url=https://my.domain.tld

Windows (x64)

If using Windows, the best choice is to use Ubuntu or Debian in WSL.

Otherwise, you can download swoole-cli-v4.8.13-cygwin-x64.zip from Swoole releases and use precompiled Cygwin-based bin/swoole-cli.exe.

A really functional and tested Windows command looks like this (modify path to your swoole-cli.exe and src\crawler.php):

c:\Tools\swoole-cli-v4.8.13-cygwin-x64\bin\swoole-cli.exe C:\Tools\siteone-crawler\src\crawler.php --url=https://www.siteone.io/

NOTICE: Cygwin does not support STDERR with rewritable lines in the console. Therefore, the output is not as beautiful as on Linux or macOS.

macOS (arm64, x64)

If using macOS with latest arm64 M1/M2 CPU, download arm64 version swoole-cli-v4.8.13-macos-arm64.tar.xz, unpack and use its precompiled swoole-cli.

If using macOS with Intel CPU (x64), download x64 version swoole-cli-v4.8.13-macos-x64.tar.xz, unpack and use its precompiled swoole-cli.

Linux (arm64)

If using arm64 Linux, you can download swoole-cli-v4.8.13-linux-arm64.tar.xz and use its precompiled swoole-cli.

Usage

To run the crawler, execute the crawler executable file from the command line and provide the required arguments:

Basic example

./crawler --url=https://mydomain.tld/ --device=mobile

Fully-featured example

./crawler --url=https://mydomain.tld/ \
  --output=text \
  --workers=2 \
  --memory-limit=1024M \
  --resolve='mydomain.tld:443:127.0.0.1' \
  --timeout=5 \
  --proxy=proxy.mydomain.tld:8080 \
  --http-auth=myuser:secretPassword123 \
  --user-agent="My User-Agent String" \
  --extra-columns="DOM,X-Cache(10),Title(40),Keywords(50),Description(50>)" \
  --accept-encoding="gzip, deflate" \
  --url-column-size=100 \
  --max-queue-length=3000 \
  --max-visited-urls=10000 \
  --max-url-length=5000 \
  --include-regex="/^.*\/technologies.*/" \
  --include-regex="/^.*\/fashion.*/" \
  --ignore-regex="/^.*\/downloads\/.*\.pdf$/i" \
  --analyzer-filter-regex="/^.*$/i" \
  --remove-query-params \
  --add-random-query-params \
  --show-scheme-and-host \
  --do-not-truncate-url \
  --output-html-report=tmp/myreport.html \
  --output-json-file=/dir/report.json \
  --output-text-file=/dir/report.txt \
  --add-timestamp-to-output-file \
  --add-host-to-output-file \
  --offline-export-dir=tmp/mydomain.tld \
  --replace-content='/<foo[^>]+>/ -> <bar>' \
  --ignore-store-file-error \
  --sitemap-xml-file==/dir/sitemap.xml \
  --sitemap-txt-file==/dir/sitemap.txt \
  --sitemap-base-priority=0.5 \
  --sitemap-priority-increase=0.1 \
  [email protected] \
  [email protected] \
  [email protected] \
  --mail-from-name="SiteOne Crawler" \
  --mail-subject-template="Crawler Report for %domain% (%date%)" \
  --mail-smtp-host=smtp.my-mail.tld \
  --mail-smtp-port=25 \
  --mail-smtp-user=smtp.user \
  --mail-smtp-pass=secretPassword123

Arguments

For a clearer list, I recommend going to the documentation: https://crawler.siteone.io/configuration/command-line-options/

Basic settings

  • --url=<url> Required. HTTP or HTTPS URL address of the website or sitemap xml to be crawled. Use quotation marks if the URL contains query parameters.
  • --single-page Load only one page to which the URL is given (and its assets), but do not follow other pages.
  • --max-depth=<int> Maximum crawling depth (for pages, not assets). Default is 0 (no limit). 1 means /about or /about/, 2 means /about/contacts etc.
  • --device=<val> Device type for choosing a predefined User-Agent. Ignored when --user-agent is defined. Supported values: desktop, mobile, tablet. Defaults is desktop.
  • --user-agent=<val> Custom User-Agent header. Use quotation marks. If specified, it takes precedence over the device parameter. If you add ! at the end, the siteone-crawler/version will not be added as a signature at the end of the final user-agent.
  • --timeout=<int> Request timeout in seconds. Default is 3.
  • --proxy=<host:port> HTTP proxy to use in host:port format. Host can be hostname, IPv4 or IPv6.
  • --http-auth=<user:pass> Basic HTTP authentication in username:password format.

Output settings

  • --output=<val> Output type. Supported values: text, json. Default is text.
  • --extra-columns=<values> Comma delimited list of extra columns added to output table. It is possible to specify HTTP header names (e.g. X-Cache) or predefined Title, Keywords, Description or DOM for the number of DOM elements found in the HTML. You can set the expected length of the column in parentheses and > for do-not-truncate - e.g. DOM(6),X-Cache(10),Title(40>),Description(50>).
  • --url-column-size=<num> Basic URL column width. By default, it is calculated from the size of your terminal window.
  • --rows-limit=<num> Max. number of rows to display in tables with analysis results (protection against very long and slow report). Default is 200.
  • --do-not-truncate-url In the text output, long URLs are truncated by default to --url-column-size so the table does not wrap due to long URLs. With this option, you can turn off the truncation.
  • --show-scheme-and-host On text output, show scheme and host also for origin domain URLs.
  • --hide-progress-bar Hide progress bar visible in text and JSON output for more compact view.
  • --no-color Disable colored output.

Resource filtering:

In the default setting, the crawler crawls and downloads all the content it comes across - HTML pages, images, documents, javascripts, stylesheets, fonts, just absolutely everything it sees. These options allow you to disable (and remove from the HTML) individual types of assets and all related content.

For example, it is very useful to disable JavaScript on modern websites, e.g. on React with NextJS, which have SSR, so they work fine without JavaScript from the point of view of content browsing and navigation.

It is particularly useful to disable JavaScript in the case of exporting websites built e.g. on React to offline form (without HTTP server), where it is almost impossible to get the website to work from any location on the disk only through the file:// protocol.

  • --disable-all-assets Disables crawling of all assets and files and only crawls pages in href attributes. Shortcut for calling all other --disable-* flags.
  • --disable-javascript Disables JavaScript downloading and removes all JavaScript code from HTML, including onclick and other on* handlers.
  • --disable-styles Disables CSS file downloading and at the same time removes all style definitions by <style> tag or inline by style attributes.
  • --disable-fonts Disables font downloading and also removes all font/font-face definitions from CSS.
  • --disable-images Disables downloading of all images and replaces found images in HTML with placeholder image only.
  • --disable-files Disables downloading of any files (typically downloadable documents) to which various links point.
  • --remove-all-anchor-listeners On all links on the page remove any event listeners. Useful on some types of sites with modern JS frameworks that would like to compose content dynamically (React, Svelte, Vue, Angular, etc.).

Advanced crawler settings

  • --workers=<int> Maximum number of concurrent workers (threads). Crawler will not make more simultaneous requests to the server than this number. Use carefully! A high number of workers can cause a DoS attack. Default is 3.

  • --memory-limit=<size> Memory limit in units M (Megabytes) or G (Gigabytes). Default is 512M.

  • --resolve=<host:port:ip> Custom DNS resolution in domain:port:ip format. Same as curl --resolve. Can be specified multiple times for multiple domain:port pairs. Example: --resolve='mydomain.tld:443:127.0.0.1

  • --allowed-domain-for-external-files=<domain> Primarily, the crawler crawls only the URL within the domain for initial URL. This allows you to enable loading of file content from another domain as well (e.g. if you want to load assets from a CDN). Can be specified multiple times. Use can use domains with wildcard *.

  • --allowed-domain-for-crawling=<domain> This option will allow you to crawl all content from other listed domains - typically in the case of language mutations on other domains. Can be specified multiple times. Use can use domains with wildcard * including e.g. *.siteone.*.

  • --single-foreign-page If crawling of other domains is allowed (using --allowed-domain-for-crawling), it ensures that when another domain is not on same second-level domain, only that linked page and its assets are crawled from that foreign domain.

  • --include-regex=<regex> Regular expression compatible with PHP preg_match() for URLs that should be included. Argument can be specified multiple times. Example: --include-regex='/^\/public\//'

  • --ignore-regex=<regex> Regular expression compatible with PHP preg_match() for URLs that should be ignored. Argument can be specified multiple times. Example: --ignore-regex='/^.*\/downloads\/.*\.pdf$/i'

  • --regex-filtering-only-for-pages Set if you want filtering by *-regex rules apply only to page URLs, but static assets (JS, CSS, images, fonts, documents) have to be loaded regardless of filtering. Useful where you want to filter only /sub-pages/ by --include-regex='/\/sub-pages\//', but assets have to be loaded from any URLs.

  • --analyzer-filter-regex Regular expression compatible with PHP preg_match() applied to Analyzer class names for analyzers filtering. Example: /(content|accessibility)/i or /^(?:(?!best|access).)*$/i for all analyzers except BestPracticesAnalyzer and AccessibilityAnalyzer.

  • --accept-encoding=<val> Custom Accept-Encoding request header. Default is gzip, deflate, br.

  • --remove-query-params Remove query parameters from found URLs. Useful on websites where a lot of links are made to the same pages, only with different irrelevant query parameters.

  • --add-random-query-params Adds several random query parameters to each URL. With this, it is possible to bypass certain forms of server and CDN caches.

  • --ignore-robots-txt Should robots.txt content be ignored? Useful for crawling an otherwise internal/private/unindexed site.

  • --http-cache-dir=<dir> Cache dir for HTTP responses. You can disable cache by --http-cache-dir='off'. Default is tmp/http-client-cache.

  • --http-cache-compression Enable compression for HTTP cache storage. Saves disk space, but uses more CPU.

  • --max-queue-length=<num> The maximum length of the waiting URL queue. Increase in case of large websites, but expect higher memory requirements. Default is 9000.

  • --max-visited-urls=<num> The maximum number of the visited URLs. Increase in case of large websites, but expect higher memory requirements. Default is 10000.

  • --max-skipped-urls=<num> The maximum number of the skipped URLs. Increase in case of large websites, but expect higher memory requirements. Default is 10000.

  • --max-url-length=<num> The maximum supported URL length in chars. Increase in case of very long URLs, but expect higher memory requirements. Default is 2083.

File export settings

  • --output-html-report=<file> Save HTML report into that file. Set to empty '' to disable HTML report. By default saved into tmp/%domain%.report.%datetime%.html.
  • --output-json-file=<file> File path for JSON output. Set to empty '' to disable JSON file. By default saved into tmp/%domain%.output.%datetime%.json.
  • --output-text-file=<file> File path for TXT output. Set to empty '' to disable TXT file. By default saved into tmp/%domain%.output.%datetime%.txt.

Mailer options

  • --mail-to=<email> Recipients of HTML e-mail reports. Optional but required for mailer activation. You can specify multiple emails separated by comma.
  • --mail-from=<email> E-mail sender address. Default values is [email protected].
  • --mail-from-name=<val> E-mail sender name. Default values is SiteOne Crawler.
  • --mail-subject-template=<val> E-mail subject template. You can use dynamic variables %domain%, %date% and %datetime%. Default values is Crawler Report for %domain% (%date%).
  • --mail-smtp-host=<host> SMTP host for sending emails. Default is localhost.
  • --mail-smtp-port=<port> SMTP port for sending emails. Default is 25.
  • --mail-smtp-user=<user> SMTP user, if your SMTP server requires authentication.
  • --mail-smtp-pass=<pass> SMTP password, if your SMTP server requires authentication.

NOTICE: For now, only SMTP without encryption is supported, typically running on port 25. If you are interested in this tool, we can also implement secure SMTP support, or simply send me a pull request with lightweight implementation.

Upload options

  • --upload Enable HTML report upload to --upload-to.
  • --upload-to=<url> URL of the endpoint where to send the HTML report. Default value is https://crawler.siteone.io/up.
  • --upload-retention=<val> How long should the HTML report be kept in the online version? Values: 1h / 4h / 12h / 24h / 3d / 7d / 30d / 365d / forever. Default value is 30d.
  • --upload-password=<val> Optional password, which must be entered (the user will be 'crawler') to display the online HTML report.
  • --upload-timeout=<int> Upload timeout in seconds. Default value is 3600.

If necessary, you can also use your own endpoint --upload-to for saving the HTML report.

How to implement own endpoint: Your own endpoint need to accept a POST request, where in htmlBody is the gzipped HTML body of the report, retention is the retention value, and password is an optional password to encrypt access to the HTML. The response must be JSON with url key with the URL where the report is available.

Offline exporter options

  • --offline-export-dir=<dir> Path to directory where to save the offline version of the website. If target directory does not exist, crawler will try to create it (requires sufficient rights).
  • --offline-export-store-only-url-regex=<regex> For debug - when filled it will activate debug mode and store only URLs which match one of these PCRE regexes. Can be specified multiple times.
  • --replace-content=<val> Replace content in HTML/JS/CSS with foo -> bar or regexp in PREG format, e.g. /card[0-9]/i -> card. Can be specified multiple times.
  • --replace-query-string=<val> Instead of using a short hash instead of a query string in the filename, just replace some characters. You can use simple format foo -> bar or regexp in PREG format, e.g. /([a-z]+)=([^&]*)(&|$)/i -> $1__$2. Can be specified multiple times. Use with caution! Query string may contain special characters and your OS/filesystem may not support them. The / is automatically replaced by ~. See issue #30 for more info.
  • --ignore-store-file-error Enable this option to ignore any file storing errors. The export process will continue.

Sitemap options

  • --sitemap-xml-file=<file> File path where generated XML Sitemap will be saved. Extension .xml is automatically added if not specified.
  • --sitemap-txt-file=<file> File path where generated TXT Sitemap will be saved. Extension .txt is automatically added if not specified.
  • --sitemap-base-priority=<num> Base priority for XML sitemap. Default values is 0.5.
  • --sitemap-priority-increase=<num> Priority increase value based on slashes count in the URL. Default values is 0.1.

Expert options

  • --debug Activate debug mode.
  • --debug-log-file=<file> Log file where to save debug messages. When --debug is not set and --debug-log-file is set, logging will be active without visible output.
  • --debug-url-regex=<regex> Regex for URL(s) to debug. When crawled URL is matched, parsing, URL replacing, and other actions are printed to output. Can be specified multiple times.
  • --result-storage=<val> Result storage type for content and headers. Values: memory or file. Use file for large websites. Default values is memory.
  • --result-storage-dir=<dir> Directory for --result-storage=file. Default values is tmp/result-storage.
  • --result-storage-compression Enable compression for results storage. Saves disk space, but uses more CPU.
  • --http-cache-dir=<dir> Cache dir for HTTP responses. You can disable cache by --http-cache-dir='off'. Default values is tmp/http-client-cache.
  • --http-cache-compression Enable compression for HTTP cache storage. Saves disk space, but uses more CPU.

Roadmap

  • Well tested Docker images for easy usage in CI/CD pipelines on hub.docker.com (for all platforms).
  • Better static assets processing - now are assets processed immediately, same as other URLs. This can cause problems with large websites. We will implement a better solution with a separate queue for static assets and separate visualization in the output.
  • Support for configurable thresholds for response times, status codes, etc. to exit with a non-zero code.
  • Support for secure SMTP.

If you have any suggestions or feature requests, please open an issue on GitHub. We'd love to hear from you!

Your contributions with realized improvements, bug fixes, and new features are welcome. Please open a pull request :-)

Motivation to create this tool

If you are interested in the author's motivation for creating this tool, read it on the project website.

Disclaimer

Please use responsibly and ensure that you have the necessary permissions when crawling websites. Some sites may have rules against automated access detailed in their robots.txt.

The author is not responsible for any consequences caused by inappropriate use or deliberate misuse of this tool.

License

This work is licensed under a License: MIT