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API Tester

Comprehensive API testing tool for making HTTP requests and analyzing responses. Test GET, POST, PUT, PATCH, DELETE, and other HTTP methods with full header and body customization. Perfect for API development, debugging endpoints, testing authentication, and exploring third-party APIs. Features include all HTTP methods support, custom headers editor with autocomplete, request body editor supporting JSON, XML, form data, and raw text, query parameter builder, authentication helpers (Bearer token, Basic auth, API key), response viewer with formatted JSON/XML, status code and headers display, response time measurement, and request history. The tool provides syntax highlighting for requests and responses, supports file uploads for multipart requests, handles cookies and redirects, tests CORS headers, validates JSON payloads, and allows saving requests as collections. Essential for backend developers testing APIs, frontend developers integrating services, QA engineers verifying endpoints, DevOps debugging integrations, and learning API consumption. Includes cURL import/export, environment variables for different endpoints, and test assertion capabilities.

100% Secure
Lightning Fast
100% Free
Client-Side Processing

Request

Headers

💡 How to Use

  • •Select the HTTP method (GET, POST, PUT, DELETE, etc.)
  • •Enter the API endpoint URL
  • •Add query parameters, headers, and request body as needed
  • •Click "Send" to make the request and view the response
  • •Response includes status code, headers, body, time, and size

How to Use API Tester

1

Enter URL

Specify API endpoint

2

Select Method

Choose GET, POST, etc.

3

Set Headers/Body

Configure request details

4

Send & Analyze

View formatted response

Features

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Before/After Compare

View side-by-side comparison

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Privacy First

All processing happens in your browser

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Instant Download

Download processed images immediately

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Mobile Friendly

Works on all devices

Frequently Asked Questions

Q:Can I test authenticated APIs?

A:Yes, add Bearer tokens, API keys, or Basic auth credentials in the headers or using built-in auth helpers.

Q:Does it support file uploads?

A:Yes, use multipart/form-data for file uploads including images, documents, and other binary files.

Q:Can I save my requests?

A:Yes, save requests to history or create collections for repeated testing.

Q:What about CORS errors?

A:CORS is browser-enforced. The tool helps diagnose CORS issues by showing response headers. For testing, the API must allow your origin.

Popular Tool Combinations

Maximize your workflow efficiency by combining API Tester with these complementary tools.

1

Complete Image Editing

Enhance your images with a full editing workflow using API Tester and more.

🔌 API Tester📋 HTTP Header Parser💻 JSON Formatter

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Why Choose Our API Tester?

Our tool is completely free, requires no registration, and processes everything in your browser for maximum privacy and speed. No file size limits, no watermarks, just pure functionality.

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