All developer tools
Updated Free mock REST & WebSocket APIs
Mock servers
- Mock APIHost a fake REST API from JSON in seconds. CRUD, filters, pagination, custom routes.
- AI mock API generatorDescribe your API in plain English; get endpoints and realistic data.
- Webhook testerA URL that captures every request so you can inspect headers and payloads.
- WebSocket testerConnect to any ws:// or wss:// server, send messages, watch the log.
- Fake REST APIFree JSONPlaceholder-style endpoints: users, posts, todos, products, orders.
- WebSocket mock serverScripted wss:// endpoint: welcome messages, timed pushes, pattern replies.
Testing
JSON & data
Encoding & crypto
- JWT DecoderRead a JWT's header and claims, with expiry shown as a date.
- Base64 Encode & DecodeUTF-8 text to Base64 and back, URL-safe mode, files to data URIs.
- URL Encode & DecodePercent-encode or decode text and parse query strings into a table.
- Hash Generator (MD5, SHA-256 & more)MD5, SHA-1, SHA-256/384/512 and HMAC of text or files.