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Spiderlint

Spiderlint crawls every page a site serves, collects facts about each request (HTML, headers, TLS, timings, sizes) and lints them against rulesets scoped by URL group, so a template missing a heading is one finding rather than one per page. Built on Node and Crawlee.

Features

• Accessibility checked from every side
• Client-rendered pages audited as visitors see them
• Every kind of page early, whatever the limit
• CSS checked as browsers read it
• The DNS behind every crawled host
• Feeds checked the way readers see them
• One finding per template, not per page
• Icons fetched and measured
• Image weight measured, not estimated
• The site measured as a whole
• Dead links, on the site and off it
• Mail authentication of every domain it crawls
• Each origin checked once, beyond its pages
• Structured data and markup checked on every page
• Speed problems found without a browser
• Privacy before consent
• Sites on any network, crawled politely
• Reports for people, pipelines and coding agents
• Page dependencies fetched once
• robots.txt read the way crawlers read it
• Over 500 rules, and new ones written as data
• Search visibility checked across the whole site
• Security headers judged, not just detected
• Scan server
• Crawl once, lint many times
• The footprint of every page view
• TLS configuration scanned in-house
• Transport checked per page, not per host
• What the CDN or host adds, kept apart
• The files a site publishes beside its pages

It also inherits the features of B19 / Ubuntu — see Features for the full list.

What this provides

• CI action damian-buho/spiderlint@0.143.1
• Container image ghcr.io/damian-buho/spiderlint:latest
• Container image damianbuho/spiderlint:latest
• npm package spiderlint — command spiderlint

Installation

Container image

Pull the published container image:

Pull from GHCR — linux/amd64

docker pull ghcr.io/damian-buho/spiderlint:latest
alias spiderlint='docker run --rm --user "$(id -u):$(id -g)" --group-add 0 --volume "$PWD:/app/ws" --workdir /app/ws ghcr.io/damian-buho/spiderlint:latest spiderlint'

Pull from DockerHub — linux/amd64

docker pull damianbuho/spiderlint:latest
alias spiderlint='docker run --rm --user "$(id -u):$(id -g)" --group-add 0 --volume "$PWD:/app/ws" --workdir /app/ws damianbuho/spiderlint:latest spiderlint'

Stable releases also publish X.Y.Z, X.Y and X tags — pull the precision you want to pin.

If the registries above are unreachable, pull from the origin instead:

Pull from Kiota — linux/amd64

docker pull kiota.ch/damian-buho/spiderlint:latest
alias spiderlint='docker run --rm --user "$(id -u):$(id -g)" --group-add 0 --volume "$PWD:/app/ws" --workdir /app/ws kiota.ch/damian-buho/spiderlint:latest spiderlint'

Then run it as if it were installed — the alias runs every example as written against the current directory:

spiderlint --help

npm package

Install the command globally:

npm install --global spiderlint

Needs Node.js >=26.

Usage

Run it as a step in a GitHub Actions workflow:

- uses: damian-buho/spiderlint@0.143.1

The action takes these inputs:

Input	Default	Description
urls		Newline-separated seed URLs. Empty takes the targets from the config file.
config_file		Projectfile or plain YAML carrying the org.spiderlint subtree, relative to the workspace.
site		One org.spiderlint.sites name to audit; a config declaring several needs one step per site.
rules		Comma-separated rulesets replacing every group’s rules (e.g. recommended,axe).
args		More audit flags, one per line with its value after a space (e.g. --max-pages 200).
fail_on	error	Severity that fails the job: error | warning | info | never
upload_sarif	false	Upload the SARIF report to code scanning; needs the security-events: write permission.
cache	true	Keep the crawl store in the forge cache, so an unchanged site is re-audited with 304s.
version		Image tag to pull (e.g. latest, 1.2.3). Empty follows the action’s own version tag, else latest.
image		Full image reference. Takes precedence over version.

spiderlint

$ spiderlint --help
spiderlint
Site-wide linter for SEO tags, security headers, TLS and links
https://dbuho.me/project/spiderlint/

Usage: spiderlint <command> [domain…] [options]
A domain is example.com or a URL to start from; without a scheme, https:// is
assumed.

Check a site:
  audit [domain…]                 crawl a site, then lint it
  crawl [domain…]                 fetch pages into the store, lint nothing
  lint [domain…]                  lint the stored pages, with no network
  show-report [domain…]           print the stored report again, in any format

Inspect:
  show-facts <url>                fetch one page and print its facts
  export-facts [domain…]          print every stored page’s facts, no network
  list-groups [domain…]           count the pages in each URL group

Rules:
  list-rules [ruleset|id…]        list rules at the severity this config gives
  list-presets                    list the shipped rulesets and their groups
  explain-rule <rule>             show a rule’s facts, expectation and fix

Cache:
  show-cache [domain…]            show the entries, bytes and age of each bucket
  purge-cache [bucket] [domain…]  delete a site’s cached entries
  warm-cache [domain…]            fetch robots.txt and sitemaps without crawling

Commands:
  help [command]                  show a command’s options and examples

Options:
  --config <path>                 settings file
                                  (default: projectfile.yaml)
                                  (env: SPIDERLINT_CONFIG)
  --site <names>                  only these org.spiderlint.sites, repeatable
                                  (default: all)
  --[no-]color                    force or disable color
                                  (default: auto, env: NO_COLOR, FORCE_COLOR)
  --[no-]progress                 status line on an interactive stderr
                                  (default: auto)
  --log-level <level>             trace, debug, info, warn, error or silent
                                  (default: warn, env: SPIDERLINT_LOG_LEVEL)
  -V, --version                   show the version
  -h, --help                      show this screen, or a command’s

Run spiderlint <command> --help for a command’s options and examples.

Exit codes:
  0  clean
  1  findings at or above --fail-on
  2  usage or config error
  3  nothing fetched, or an --offline cache miss
  4  the run failed

Examples and every command’s help are in Usage.

Building

Clone the repository with its submodules:

git clone --recurse-submodules https://codeberg.org/damian-buho/spiderlint spiderlint && cd spiderlint

Build the container image locally:

make container-build

• Makefile reference

Run make with no arguments for the default target; run make help to list every target.

For the local dev loop, make dev-container brings up the dev-container.

Pipeline entry points:

• make analyzed — Run the heavy analysis sweep (mutation testing, benchmarks)
• make audited — Re-scan the pinned dependencies and published artifacts for new vulnerabilities
• make check-outdated — Report every pinned dependency that lags upstream
• make ready-to-publish — Run the pseudo-CI pipeline locally — build, test and scan, without publishing

Documentation

• Run spiderlint from a checkout

Policies

• How to contribute
• Security policy
• Getting support
• Code of Conduct
• AI and LLM Policy

Links

• Issues on GitHub
• Projectfile Specification

License

This project is licensed under AGPL-3.0-only — see the LICENSE file for details.