About

API Tools

REST API Tester

Test REST APIs online with a free REST API testing and debugging tool. Send GET, POST, PUT, PATCH and DELETE requests and inspect API responses instantly.

Features

  • GET, POST, PUT, PATCH, and DELETE requests
  • Headers and request body testing
  • Response inspection for API debugging

How to use it

  1. Enter the REST endpoint URL.
  2. Choose an HTTP method and add headers or a body.
  3. Send the request and inspect the status, headers, and response.

Example and use cases

Send a GET request to a JSON REST service and format the response with the JSON Formatter.

Useful for developers and students learning REST, checking endpoints, testing JSON services, and debugging API integrations.

API & Backend

REST API Tester

Test REST APIs directly from your browser. Build requests, configure headers and authentication, inspect responses, and generate code for multiple programming languages.

Query Parameters

Parameters are appended to the URL.

No query parameters.

01

Build request

Choose an HTTP method and enter the API endpoint.

02

Configure

Add query parameters, authentication, headers and request body.

03

Send

The browser sends the HTTP request using Fetch API.

04

Inspect

View status, timing, headers, cookies and response body.

Example

GEThttps://jsonplaceholder.typicode.com/users

Try a public REST endpoint to inspect JSON responses, HTTP status codes and response headers.

FAQ

What is a REST API tester?
A REST API tester lets developers create HTTP requests and inspect API responses without building a frontend application.
Why am I getting Unexpected token '<'?
This usually happens when an application expects JSON but the server returns HTML, often because the URL is incorrect, the endpoint does not exist, a proxy redirects the request, or the server returned an HTML error page. This tool safely checks the response content type before parsing JSON.
Does this tool support authentication?
Yes. Bearer Token, Basic Authentication and API Key authentication are supported.
Can I send JSON requests?
Yes. Select POST, PUT or PATCH, open Body, choose JSON and enter a valid JSON payload.
Why does my API request fail with a CORS error?
Browsers enforce Cross-Origin Resource Sharing. If the target API does not allow your website origin, a browser-only API tester cannot bypass that restriction. A server-side proxy is required for those APIs.
Are request history and variables stored on a server?
No. This implementation stores history and local variables in your browser's localStorage.

Frequently asked questions

What is a REST API tester?

It is an API testing tool that sends HTTP requests and displays the response so you can inspect a REST service without writing a separate client.

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