API Tester
Test REST APIs with all HTTP methods, headers, and body
What is API Tester?
The API Tester is a free online tool that lets you send HTTP requests to any API endpoint directly from your browser and inspect the response, without needing to install Postman, curl, or any other software. Testing APIs is a daily task for developers building integrations, debugging backend services, verifying authentication, and exploring third-party APIs. This tool supports all standard HTTP methods including GET, POST, PUT, PATCH, and DELETE, lets you add custom headers like Authorization and Content-Type, and accepts JSON or form-encoded request bodies. The response panel shows the status code, response headers, and formatted response body so you can immediately see whether your API call succeeded and what data was returned. It is the fastest way to test an API endpoint without writing any code.
Why Use DevBench API Tester?
DevBench tools are built with one principle: everything runs in your browser. Unlike most online tools that upload your data to remote servers, DevBench processes everything locally using client-side JavaScript. This means your files, code, and sensitive data never leave your device. There are no accounts to create, no usage limits, no watermarks, and no paywalls. Every tool on DevBench is completely free to use as many times as you need. Whether you are a professional developer, a student learning to code, or someone who occasionally needs a quick utility, DevBench gives you instant access to powerful tools without friction.
How to Use API Tester
Using the API Tester is straightforward and requires no installation or sign-up. Follow these steps to get started:
- Enter API endpoint URL
- Select HTTP method (GET, POST, PUT, DELETE)
- Add headers and request body if needed
- Click "Send Request" to test API
- View response status, headers, and body
All processing happens directly in your browser, so your data stays private and results are instant.
Examples
Here are some common examples of how the API Tester is used in real-world scenarios:
- Test GET request to fetch data
- Send POST request with JSON payload
- Test API authentication with headers
- Send PUT request to update data
- Test DELETE request to remove data
Use Cases
The API Tester is used by developers, designers, and professionals across many industries. Common use cases include:
- Testing REST API endpoints
- Debugging API responses
- Testing API authentication
- Sending test API requests
- Debugging API errors
- Testing API headers
- Sending JSON payloads
- Testing API rate limits
- Debugging CORS issues
- Testing API integrations
Whether you are a beginner learning the basics or an experienced developer working on complex projects, this tool is designed to fit seamlessly into your workflow.
Frequently Asked Questions
Here are answers to the most common questions about the API Tester:
What HTTP methods are supported?
Supports GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS methods.
Can I add custom headers?
Yes, add any custom headers including Authorization, Content-Type, and API keys.
Does it support authentication?
Yes, add Authorization header with Bearer token, API key, or Basic auth credentials.
Can I test GraphQL APIs?
Yes, use POST method with GraphQL query in request body and Content-Type: application/json.
Are requests logged?
No, all requests are made from your browser. No data is logged or stored on servers.