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OpenAPI Breaking Change Detector

Detect breaking API changes in pull requests before clients break.

Intermediate14h1–2 people17/20 fit
TL;DR

Build OpenAPI Breaking Change Detector for api teams in ~14h with 1–2 people. Stack: OpenAPI + Node.js + GitHub Actions.

Why it wins: Clear, testable devtool.

Build flow

01 · Problem
API changes silently break mobile apps and partners.
02 · Solution
Diff two OpenAPI specs, classify changes as breaking or safe and post a summary with affected endpoints on the PR.
03 · Build
  1. 1Load specs
  2. 2Diff paths and schemas
  3. 3Classify
  4. 4Comment on PR
04 · Demo
Remove a required field and see the PR flagged.

MVP checklist

  • Spec diff
  • Breaking rules
  • PR summary
  • Changelog

Tech stack

TechRole
OpenAPIAPI specification
Node.jsBackend runtime
GitHub ActionsRepo + PR data

Reference repos

Open-source projects you can build on. Links checked 2026-10-31.

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