API Request Tester

API Request Tester - Test REST APIs Online

A powerful online API request tester for testing REST APIs directly from your browser. Send HTTP requests with any method (GET, POST, PUT, DELETE, PATCH), customize headers, add request body, and view detailed response information including status codes, headers, body, and timing.

What is an API Request Tester?

An API Request Tester is a tool that allows you to send HTTP requests to APIs and view their responses. It's essential for:

- Testing API endpoints during development
- Debugging API issues
- Exploring third-party APIs
- Verifying authentication and authorization
- Testing different HTTP methods
- Checking API response formats

It acts as a client that can communicate with any REST API, similar to tools like Postman or Insomnia.

How do I test an API?

Testing an API is simple:

1. Enter the API endpoint URL
2. Select the HTTP method (GET, POST, PUT, DELETE, PATCH)
3. (Optional) Add custom headers in JSON format
4. (Optional) Add request body for POST/PUT/PATCH requests
5. Click 'Send Request'
6. View the response status, headers, body, and timing

Example GET request:
URL: https://jsonplaceholder.typicode.com/users/1
Method: GET

Example POST request:
URL: https://jsonplaceholder.typicode.com/posts
Method: POST
Body: {"title": "Test", "body": "Content", "userId": 1}

What HTTP methods are supported?

This tool supports all standard HTTP methods:

- GET: Retrieve data from the server
- POST: Send data to create new resources
- PUT: Update existing resources completely
- PATCH: Partially update existing resources
- DELETE: Remove resources
- HEAD: Get headers only (no body)
- OPTIONS: Check supported methods

Most APIs use GET (read), POST (create), PUT/PATCH (update), and DELETE operations.

How do I add custom headers?

Headers must be added in valid JSON format:

{
"Content-Type": "application/json",
"Authorization": "Bearer your-token-here",
"X-Custom-Header": "value"
}

Common headers:
- Content-Type: Specifies request body format (application/json, text/xml)
- Authorization: Authentication tokens (Bearer, Basic, API keys)
- Accept: Expected response format
- User-Agent: Client identification
- X-API-Key: API key authentication

Headers are key-value pairs that provide metadata about the request.

What about CORS errors?

CORS (Cross-Origin Resource Sharing) is a browser security feature that may block API requests from this tool:

- Many APIs don't allow requests from browsers
- This is normal security behavior
- Public APIs often have CORS enabled
- Private APIs may block browser requests

Solutions:
- Use APIs that support CORS
- Test with browser extensions that disable CORS (for testing only)
- Use backend tools for production testing
- Contact API providers to enable CORS

For serious API testing, consider using dedicated tools like Postman, Insomnia, or backend testing frameworks.

Is my data safe?

Privacy considerations:

- Requests go directly from your browser to the API
- No data passes through our servers
- We don't log or store any request/response data
- Be cautious with sensitive data (passwords, tokens)
- Avoid testing with production credentials
- Consider using test/sandbox API endpoints

Security tips:
- Don't share API keys publicly
- Use environment-specific credentials
- Test with dummy data when possible
- Revoke test tokens after use

Key Features

• Test any REST API endpoint
• Support all HTTP methods (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS)
• Add custom request headers
• Send request body (JSON, XML, text)
• View response status codes
• Display response headers
• Show formatted response body
• Measure response time
• Calculate response size
• Syntax highlighting for JSON responses
• Copy response data to clipboard
• Dark mode support
• 100% client-side - requests go directly to APIs
• No data logging or storage
• Mobile-friendly responsive design