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Resources Reverse-Engineer Any API Using REA AI

Reverse-Engineer Any API Using REA AI

One prompt in Cursor with Claude Code, 11 follow-ups and a 14-page guide for documenting an app's main API calls with REA and Claude in Chrome. For educational purposes only.

What it does

Shows you how to set up Cursor, Claude Code, Claude in Chrome and REA, then document an app's main API calls with one small first prompt, fix and grow the notes with follow-ups, and turn them into an OpenAPI file, docs, a mock server and tests. Includes a worked example on a made-up bakery app.

Who it's for

Developers, freelancers and AI learners who need to document or connect to an app's API that they own or are allowed to study.

What you need

A Claude paid plan (Pro or higher), Cursor with the Claude Code extension, Google Chrome with the Claude in Chrome extension, the Claude desktop app, and an app you are allowed to study with a test account. REA is installed by your agent from its GitHub page.

What's included

  • 14-page step-by-step guide
  • One-shot first prompt for the main API calls
  • 11 follow-up prompts as plain text
  • Worked example on a made-up app
  • Sharing checklist, 7-day plan and fix-it table

How to use it

Follow the guide from set-up to the first prompt, then use the follow-ups. This page offers a free 6-page sample of the guide. The full guide with the prompts is a paid download. Use it only on apps you own or have permission to study.

Learn more

Read the Claude AI Guide

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