REST API Tester

About This Tool

This REST API tester lets you send HTTP requests to any API endpoint and see the real response. Unlike AI chatbots that hallucinate API responses, this tool makes actual HTTP requests and shows you the real response status, headers, and body.

Why AI Cannot Test APIs

AI language models like ChatGPT, Claude, and Gemini cannot make real HTTP requests. They can only describe what an API might return based on training data. When you need to know the actual response status, headers, timing, or body of an API endpoint, you need a real HTTP client. AI:

• Cannot send requests - AI has no network access to make HTTP calls
• Hallucinates responses - AI invents status codes, headers, and response bodies
• Cannot measure timing - Response time, latency, and performance metrics require real requests
• Cannot handle auth - Real API testing needs actual authentication headers and tokens
• Gives inconsistent results - AI gives different API responses to the same query

How to Use

1. Select method - Choose GET, POST, PUT, PATCH, DELETE, HEAD, or OPTIONS
2. Enter URL - Type or paste the full API endpoint URL
3. Add headers - Set Content-Type, Authorization, or any custom headers
4. Add body - For POST/PUT/PATCH, enter the request body (JSON, XML, text)
5. Send - Click Send to make the real HTTP request
6. View response - See real status code, timing, headers, and response body

Features

• 7 HTTP methods - GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS
• Custom headers - Add any number of request headers
• Request body - Send JSON, XML, form data, or plain text
• Response timing - See exact response time in milliseconds
• Status codes - Color-coded status badges (2xx green, 4xx red, etc.)
• Response headers - View all response headers
• JSON formatting - Auto-formatted JSON response body
• Copy as cURL - Generate a cURL command from your request
• Sample templates - Quick-load test requests for common scenarios
• 30s timeout - Requests automatically timeout after 30 seconds
• 500KB limit - Large responses are safely truncated
• 100% private - Requests go through our proxy, responses not stored

Frequently Asked Questions

What is a REST API tester?

A REST API tester is an HTTP client that lets you send requests to API endpoints and inspect the real responses, including status codes, headers, and body content. It's essential for developing and debugging web APIs.

Why can't AI test my API?

AI models have no network access and cannot make real HTTP requests. They can only generate fictional responses based on patterns in training data. These hallucinated responses may look realistic but are often wrong. Only a real HTTP client can show you the actual API response.

Is my data private?

Yes. All requests are proxied through our Cloudflare function to avoid CORS restrictions. We do not log, store, or cache any request data or responses. Your API keys and request data are never saved on our servers.

What are the limitations?

Requests timeout after 30 seconds. Response bodies over 500KB are truncated. Private/internal IPs (localhost, 10.x.x.x, 192.168.x.x) are blocked for security. A limited set of dangerous ports (SSH, MySQL, etc.) are also blocked.

Can I test authenticated APIs?

Yes. Add an Authorization header using the headers editor. Bearer tokens, Basic auth, API keys in headers or query parameters all work. Your authentication credentials are not stored or logged.

What HTTP methods are supported?

All common HTTP methods are supported: GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. The request body field is automatically shown for methods that typically include a body.

Can I generate cURL commands?

Yes. After sending a request, click "Copy as cURL" to generate an equivalent cURL command with all the headers, method, URL, and body included. Perfect for sharing requests or running them in your terminal.

Is this a replacement for Postman?

This tool is a lightweight, no-install alternative for quick API testing. It's ideal for testing a single endpoint, checking response formats, or debugging API issues. For complex workflows with multiple requests and environments, dedicated tools like Postman or Insomnia are more suited.