REST Client & API Tester
Send HTTP requests and inspect responses directly in your browser. Test GET, POST, PUT, DELETE and more with custom headers and request bodies.
⚠ Best for public APIs and APIs that allow browser requests. Some private or server-only APIs may block requests due to CORS.
⚡ All HTTP methods
Send GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS requests with full control over headers and body.
📋 Custom headers
Add Authorization tokens, Content-Type, API keys, and any other headers your endpoint requires.
📝 Request body
Send JSON, form data, or plain text as your request body. Perfect for testing POST and PUT endpoints.
🔍 Response inspector
See the status code, response time, and full formatted response body with syntax highlighting.
🌐 CORS aware
Requests are sent directly from your browser. Works with any public API and most APIs that allow browser requests.
🔒 No proxy needed
Requests go directly from your browser to the target API. DevCrate does not proxy or inspect your request payloads, headers, or tokens.
How to use the REST Client
Testing a GET request
Select GET from the method dropdown, paste your API endpoint URL into the address bar, and click Send. The response body, status code, and response time appear instantly. No setup, no authentication required for public APIs. Try it with a public endpoint like https://jsonplaceholder.typicode.com/posts/1 to see a live JSON response.
Testing a POST request with a JSON body
Select POST, add a Content-Type header with value application/json, and paste your JSON payload into the body field. The REST Client sends the exact payload to your endpoint and displays the full response. This is the most common way to test API endpoints that create or update data.
Adding authentication headers
Most production APIs require authentication. Add an Authorization header with your token — for Bearer tokens use the format Bearer your-token-here. For API key authentication add the key as a custom header using the name your API provider specifies. Your headers and tokens stay entirely in your browser — they are never sent to any DevCrate server.
Understanding HTTP status codes
Every API response includes a status code that tells you whether the request succeeded. The most common ones are: 200 OK (success), 201 Created (resource created), 400 Bad Request (invalid input), 401 Unauthorized (missing or invalid auth), 403 Forbidden (valid auth but not enough permissions), 404 Not Found (endpoint doesn't exist), and 500 Internal Server Error (something went wrong on the server).
REST Client vs Postman — when to use which
Postman is a full-featured API platform with collections, environments, team sharing, and automated testing. DevCrate's REST Client is for quick, one-off API tests directly in your browser — no installation, no account, no setup. If you need to quickly check what an endpoint returns or verify a token is working, the DevCrate REST Client is faster. If you're managing a large API workflow with hundreds of saved requests, Postman is the right tool.
Common use cases
Developers use the REST Client to verify that a new API endpoint is returning the expected response, test authentication flows without writing code, debug webhook payloads, check if a third-party API is responding correctly, and quickly prototype API calls before implementing them in code. It is particularly useful during development when you need to test a single endpoint without switching to a dedicated API client.