api-diff

What it does

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.

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  API Diff2022 · api-diff.io · ▲161

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  Diffly2025 · diffly.dev · ▲6

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• IR
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  Sharing an internal tool that accelerated my development work 10-fold, especially with API debugging. Thought fellow developers here might find it useful. As a developer, I often have trouble reproducing errors at the client end. https://intercept.rest lets me debug and monitor API requests and responses. It is similar to the Network tab in Chrome Developer Tools but works for any API: mobile apps, webhooks, frontend etc. After I shared it with a close circle of friends, they found it incredibly useful and even found new use cases, I never imagined. Been a long time lurker here and…

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