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api-diff
Catch API contract drift before your users do
Backend changes a field. Frontend breaks silently. TypeScript types go stale. Nobody notices until users complain. api-diff intercepts every fetch call and deep-diffs the actual response against a schema you define once. When something drifts, you know immediately. Supports wildcard routes, strict mode, granular ignore patterns, and an onDrift callback for Sentry or analytics. Zero dependencies. Full TypeScript support.
Hey Product Hunt! 👋
I'm Nakshatra, a Frontend Lead working in fintech
for 2.5 years. This bug kept hitting us repeatedly
— backend quietly renames a field, frontend breaks
silently, TypeScript types are stale, nobody notices
until users file a support ticket.
Existing solutions felt too heavy. OpenAPI needs
backend cooperation. Zod requires actively maintained
schemas. I wanted something I could drop in with
5 lines and zero backend changes.
So I built api-diff.
It wraps globalThis.fetch, clones every matched
response, and deep-diffs it against a schema you
define once. Your app gets the original response
untouched — the clone is what gets checked.
643 downloads in 2 weeks with zero paid promotion.
Would love feedback on:
→ The API design — does it feel natural?
→ What framework integrations would help most?
→ What's missing for your use case?
Thanks for checking it out 🙏
About api-diff on Product Hunt
“Catch API contract drift before your users do”
api-diff was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #7 on the daily leaderboard. Backend changes a field. Frontend breaks silently. TypeScript types go stale. Nobody notices until users complain. api-diff intercepts every fetch call and deep-diffs the actual response against a schema you define once. When something drifts, you know immediately. Supports wildcard routes, strict mode, granular ignore patterns, and an onDrift callback for Sentry or analytics. Zero dependencies. Full TypeScript support.
On the analytics side, api-diff competes within API, Open Source, Developer Tools and GitHub — topics that collectively have 727.6k followers on Product Hunt. The dashboard above tracks how api-diff performed against the three products that launched closest to it on the same day.
Who hunted api-diff?
api-diff was hunted by Nakshatra Garg. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Nakshatra Garg