HTTP Request Builder & API Tester
Build and test HTTP API requests visually. Send requests with custom headers, body, and see responses instantly.
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🔒 All requests are sent directly from your browser to the API. No data passes through our servers.
Request Configuration
No headers added. Click "+ Add Header" to add custom headers.
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How to Use the HTTP Request Builder
This HTTP request builder makes API testing simple and visual. Start by entering the API endpoint URL in the URL field. Select the HTTP method (GET, POST, PUT, DELETE, etc.) based on what you want to do - GET to fetch data, POST to create new resources, PUT to update existing ones, or DELETE to remove resources.
Add custom headers if your API requires them. Common headers include Authorization for authentication tokens, Content-Type to specify the data format, Accept to tell the server what response format you want, and custom API-key headers required by some services. Each header is a key-value pair that provides metadata about your request.
For POST, PUT, and PATCH requests, you can include a request body with the data you're sending. This is typically JSON for modern REST APIs. Make sure your JSON is properly formatted - the tool will help validate it. The response appears in real-time, showing the status code, headers, and body. Status codes in the 200s mean success, 400s indicate client errors, and 500s mean server errors.
Use this tool to test APIs during development, debug integration issues, explore third-party APIs, or learn how HTTP requests work. It's perfect for quick API tests without needing to write code or install desktop applications. Remember that CORS (Cross-Origin Resource Sharing) restrictions may prevent some requests from browsers - this is a security feature enforced by the browser, not a limitation of the tool.
Frequently Asked Questions
What is an HTTP request builder?
An HTTP request builder is a tool that lets you construct and send HTTP requests to APIs without writing code. You can specify the URL, method (GET, POST, PUT, DELETE), headers, and request body using a visual interface, then send the request and view the response. It's essential for API testing and development.
What HTTP methods are supported?
This tool supports all common HTTP methods: GET (retrieve data), POST (create new data), PUT (update existing data), PATCH (partially update data), DELETE (remove data), HEAD (get headers only), and OPTIONS (check available methods). Each method serves a specific purpose in RESTful APIs.
How do I test APIs that require authentication?
Add authentication through custom headers. For Bearer token auth, add an 'Authorization' header with value 'Bearer YOUR_TOKEN'. For Basic auth, add 'Authorization: Basic BASE64_CREDENTIALS'. For API keys, follow the API's documentation - they're often sent as headers like 'X-API-Key' or query parameters.
Can I send JSON data in the request body?
Yes! Select POST, PUT, or PATCH as the method, then enter your JSON in the request body field. The tool automatically sets the Content-Type header to application/json. Make sure your JSON is valid - use the JSON formatter tool if needed to validate syntax before sending.
Why does my request fail with CORS error?
CORS (Cross-Origin Resource Sharing) errors occur when the API server doesn't allow requests from web browsers on different domains. This is a browser security feature. If you encounter CORS errors, the API needs to be configured to allow browser requests, or you'll need to use a server-side proxy or tools like curl instead.
Is this tool secure for testing production APIs?
This tool runs entirely in your browser - requests are sent directly from your browser to the API, and no data passes through our servers. However, be cautious with sensitive data: don't test with real user credentials, payment info, or API keys that grant dangerous permissions. Use test/sandbox environments when available.