Browser-based HTTP client — test APIs without installing tools

The DevBench API Tester lets you send HTTP requests (GET, POST, PUT, PATCH, DELETE) directly from your browser without installing Postman, Insomnia, or any other client. Add headers, set a request body, configure authentication, and inspect formatted JSON or text responses — all in one workspace. Requests go through our secure server-side proxy, bypassing CORS restrictions so any public API works out of the box.

Features

• GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS methods
• Collections to save and organise requests (stored locally)
• Environment variables with {{variable}} substitution
• Multiple request tabs — open several requests at once
• Bearer, Basic, API Key, and custom Authorization headers
• JSON (with syntax highlighting), Form Data, XML, and raw request bodies
• Response headers, timing, raw body, and code snippet export
• WebSocket and Socket.IO connection testing
• GraphQL over HTTP and gRPC-Gateway / JSON transcoding
• Import from HAR, cURL, OpenAPI, and Postman collections

Also useful: cURL → Fetch converter, URL Parser, JSON Formatter.