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Ready to send
Configure your request above and click Send// build and send http requests visually
Build and send HTTP requests visually. Set headers, query params, and body — inspect status, timing, and response. Free, browser-based, no sign-up.
Ready to send
Configure your request above and click SendType the API endpoint URL and select the HTTP method (GET, POST, PUT, etc.) from the dropdown.
Add query params, custom headers, authentication, or a request body using the tabs below the URL bar.
Click Send and inspect the response — status code, headers, body, and timing all displayed instantly.
API Request Builder is a free browser-based GUI HTTP client. You can construct and fire HTTP requests to any public API endpoint and inspect the full response — status code, response headers, body content, and round-trip timing — all from your browser with no installation.
This tool proxies requests server-side to avoid CORS restrictions you would encounter in a pure client-side tool.
Yes, completely free. No sign-up, no account, no limits. The tool is browser-based and processes requests through a server-side proxy to handle CORS restrictions.
Browsers enforce CORS policies that prevent direct cross-origin requests from client-side JavaScript. By routing through a server-side proxy, this tool can reach any public API endpoint without CORS issues.
All standard HTTP methods: GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. You can select the method from the dropdown next to the URL input.
Yes. Switch to the Body tab, select JSON mode, paste or type your JSON payload. The tool sends it as-is with the appropriate content handling.
Yes. The Auth tab supports Bearer Token authentication (adds an Authorization: Bearer header) and Basic Auth (username + password, base64 encoded automatically).
No. For security, requests to private IP ranges (10.x, 192.168.x, 127.x) and localhost are blocked. Use a local tool like Postman or curl for internal APIs.
Go to the Headers tab and click "+ Add Header" to add as many key-value pairs as needed. Use the preset chips for common headers like Content-Type and Authorization.
Yes. Use the "Copy Response" button to copy the full response body to your clipboard, or "Download" to save it as a .txt or .json file locally.
An API Request Builder is a graphical interface that lets developers construct and send HTTP requests to web APIs without writing any code. Instead of opening a terminal and composing a curl command, or bootstrapping a small script just to hit an endpoint, you fill in a form: choose the HTTP method, paste the URL, add headers and parameters, and press Send. The response — status code, headers, and body — appears immediately in a structured viewer.
This tool is designed for developers who need to explore, test, or debug REST APIs during development. Whether you're checking that a third-party integration is returning the right data shape, verifying that your new backend route behaves correctly, or just inspecting what an API returns before you write a client, an API request builder dramatically accelerates that feedback loop.
Every time your browser loads a page or a JavaScript app fetches data, it's sending an HTTP request. HTTP (HyperText Transfer Protocol) is the foundation of data communication on the web. A request consists of:
GET to read data, POST to create, PUT/PATCH to update, DELETE to remove. HEAD retrieves headers without a body; OPTIONS checks what methods a server supports (important for CORS preflight).?page=2&limit=10).The server processes the request and returns a response with a status code (200 OK, 404 Not Found, 500 Internal Server Error, etc.), response headers, and a response body.
Status codes are grouped into five classes, each indicating a different category of outcome:
200 OK is the standard success response; 201 Created indicates a resource was created; 204 No Content means success but no response body.301 Moved Permanently and 302 Found redirect to a new URL.400 Bad Request means invalid syntax; 401 Unauthorized means authentication is required; 403 Forbidden means you're authenticated but lack permission; 404 Not Found is the classic missing resource error.500 Internal Server Error is a generic server failure; 502 Bad Gateway indicates an upstream issue; 503 Service Unavailable usually means the server is temporarily overloaded.REST (Representational State Transfer) is the architectural style used by the vast majority of modern web APIs. RESTful APIs use standard HTTP methods to perform CRUD (Create, Read, Update, Delete) operations on resources, identified by URLs. For example, a typical user resource might have these endpoints:
GET /users — List all usersGET /users/42 — Get user with ID 42POST /users — Create a new user (JSON body required)PUT /users/42 — Replace user 42 entirelyPATCH /users/42 — Partially update user 42DELETE /users/42 — Delete user 42With this API Request Builder, you can test all of these operations interactively before or alongside writing your client code.
HTTP headers carry metadata. Common request headers include Content-Type (tells the server what format the body is in), Accept (tells the server what format you want back), and Authorization (carries credentials).
Most production APIs require authentication. The two most common mechanisms are:
Authorization: Bearer <token> on subsequent requests. Our Auth tab automates this.Authorization: Basic <encoded>. Again, the Auth tab handles the encoding for you.API keys are another common method — these are usually just custom headers (like X-API-Key: your-key) which you can add manually in the Headers tab.
curl is the standard command-line HTTP tool, and it's excellent — but composing complex requests with multiple headers, authentication, and JSON bodies can get verbose. Postman is the industry-leading GUI API client with many advanced features, but it requires a desktop installation and an account for most useful functionality.
This API Request Builder gives you a fast, lightweight alternative for quick testing, accessible entirely from your browser with zero setup. It's ideal for checking public APIs, verifying webhook payloads, or a quick sanity check while developing — without the overhead of opening and configuring a full application.
X-RateLimit-Remaining, X-Request-ID, or cache control directives.