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Free

API Tester

Build and send HTTP requests, inspect responses, save history.

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JWT Decoder

Decode and inspect JWT header/payload, verify signatures.

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Webhook Tester

Get a unique inbox URL and inspect incoming webhook requests live.

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GraphQL Explorer

Run queries against any GraphQL endpoint and browse its schema.

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API Response Diff Checker

Compare two API responses and see a structured diff.

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REST API Builder

Design REST endpoint specs and generate docs/mocks from them.

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Webhook Monitor

Continuously monitor an endpoint for uptime/latency via cron.

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API Mock Server

Spin up a public mock endpoint that returns configured responses.

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API Rate Limit Tester

Burst-test an endpoint to find its effective rate limit.

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OAuth Playground

Walk through an OAuth2 Authorization Code flow and inspect tokens.

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CSS Gradient Generator

Design and export CSS gradients.

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JSON Formatter & Validator

Validate, pretty-print, and minify JSON.

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App Store Metadata Generator

Generate App Store/Play Store metadata.

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App Release Notes Generator

Generate app store release notes.

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Free

Random Key Generator

Generate passwords, API keys, AES keys, UUIDs, and RSA/SSH key pairs — all client-side.

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Free

Password Generator

Generate strong random passwords.

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Free

UUID Generator

Generate v4/v7 UUIDs in bulk.

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