ERB Escape Audit - Rails XSS lint

Runs the same checker as our npm package on a Node.js runtime that pip installs for you (nodejs-wheel-binaries) - no system Node.js needed. Your files are checked locally.

15 rules that find every line in a Rails .erb view where output escaping was switched off or was the wrong escaping.

Install

erb-escape-audit file

Node 18+. The same 15 rules as the VS Code extension, from a terminal or CI.

Free

• Audit the .erb file you have open: every unescaped-output line with its line number, severity and the escaping helper that fixes it - no key, no cap, no watermark.
• --rules lists every rule

With a licence ($29 once)

• Sweep every .erb file in the workspace in one run and write a dated Markdown/CSV report you keep as the evidence artefact for a release note or a vulnerability-handling record.

erb-escape-audit --dir ./templates --report html --out report.html

A freelance Rails developer doing the same template review by hand bills $75-$150 an hour.

Use from an AI agent (MCP)

Claude Code · Cursor · Windsurf · any MCP client - add to your MCP config:

{ "mcpServers": { "erb-escape-audit": { "command": "erb-escape-audit", "args": ["--mcp"] } } }

Tools: check_text and check_file (free) · check_dir (licence). The agent gets every finding with the line number.

Use in CI

- name: ERB Escape Audit - Rails XSS lint
  run: pip install rulestamp-erb-escape-audit && erb-escape-audit --dir . --ci

The folder sweep, reports and CI mode need one licence — one payment, no subscription. Set READYSTACK_LICENSE=<key> or run --license <key> once.

Get a licence

Install (PyPI)

pip install rulestamp-erb-escape-audit
erb-escape-audit --help