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.
Searchable reference of common git commands.
Visualize and help resolve merge conflicts.
Generate a changelog from commit history.
Validate, pretty-print, and minify JSON.
Diff two JSON documents.
Search and tail uploaded log files.
Summarize error rates/patterns in logs.
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.