How to Build a Secure AI PR Reviewer with Claude, GitHub Actions, and JavaScript

A step-by-step guide to building a secure AI-powered pull request reviewer using JavaScript, Claude (Anthropic), GitHub Actions, Zod, and Octokit. The tutorial covers the full pipeline: fetching PR diffs, redacting secrets, trimming input for cost control, sending sanitized diffs to Claude with a hardened system prompt to

#javascript

#github-actions

#claude

#prompt-injection

#zod

Apr 10•19m read time•From freecodecamp.org

Table of contents

Table of Contents Prerequisites Understanding What a Pull Request Really Is What We Are Going to Build The Two Biggest Problems in AI PR Review Architecture Overview Set Up the Project Create the Reviewer Logic Define the JSON Schema for Claude Output Read Diff Input from the CLI Redact Secrets and Trim Large Diffs Validate Claude Output with Zod Test the Reviewer Locally Connect the Same Logic to GitHub Actions Post PR Comments with Octokit Create the GitHub Actions Workflow Run the Full Flow on GitHub Why This Matters Recap Try it Yourself Final Words

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