Postman now pushes everyone into an account and a cloud workspace. These free developer tools test APIs right in the browser without signing up.
Open-source API client for REST, GraphQL and WebSocket requests.
Hoppscotch is an open-source API development tool that runs in the browser. You can send REST requests, test GraphQL queries, and connect to WebSocket, SSE, Socket.IO and MQTT endpoints.
Get a URL that captures incoming HTTP requests.
Webhook.site instantly gives you a unique URL and email address. Any HTTP request or email sent to it shows up on the page in real time, with headers, query string, body and timing.
Decode and debug JSON Web Tokens.
jwt.io lets you decode, verify and generate JSON Web Tokens. Paste a token and it splits it into header, payload and signature, showing the claims in readable JSON.
Visualize API responses as an interactive graph.
JSON Crack turns JSON data into an interactive graph, so you can see the structure of a large or deeply nested document at a glance. Each object becomes a node and you can zoom, pan, collapse and search.
Encoders, hashes, UUIDs and other API helpers.
IT Tools is an open-source collection of more than 80 handy utilities for developers and IT people. It includes UUID and ULID generators, hash and HMAC tools, Base64 and URL encoders, a JWT parser, a cron helper, color converters, and network calculators.
Hoppscotch is our top pick. Open-source API client for REST, GraphQL and WebSocket requests.
Yes. Every tool on this list has a free version you can use without paying. Some offer paid upgrades, but the core features listed here are free.
No. We only list tools that work without signing up.