API testing, JSON/DB/Git utilities, DevOps generators, AI dev tools and more — free, no signup for the basics.
Build and send HTTP requests, inspect responses, save history.
Decode and inspect JWT header/payload, verify signatures.
Get a unique inbox URL and inspect incoming webhook requests live.
Run queries against any GraphQL endpoint and browse its schema.
Compare two API responses and see a structured diff.
Design REST endpoint specs and generate docs/mocks from them.
Continuously monitor an endpoint for uptime/latency via cron.
Spin up a public mock endpoint that returns configured responses.
Burst-test an endpoint to find its effective rate limit.
Walk through an OAuth2 Authorization Code flow and inspect tokens.
Design and export CSS gradients.
Validate, pretty-print, and minify JSON.
Generate App Store/Play Store metadata.
Generate app store release notes.
Generate passwords, API keys, AES keys, UUIDs, and RSA/SSH key pairs — all client-side.
Generate strong random passwords.
Generate v4/v7 UUIDs in bulk.