API Request Builder

Set a method, URL, headers, and body to send a real HTTP request from your browser and inspect the status, headers, and response body, like a lightweight Postman.

Headers

Requests are sent directly from your browser to the target server. Many APIs block cross-origin browser requests (CORS) unless they explicitly allow it, that's a server-side restriction, not something this tool can bypass.

Example input

GET https://api.example.com/users

Example output

200 OK, { "users": [...] }

What is a API Request Builder?

The API Request Builder is a lightweight HTTP client that runs in your browser. Choose a method, enter a URL, add headers and a body, send the request and inspect the status code, response headers and body, with no install and no account.

When to use it

Use it to quickly check an endpoint, reproduce a bug, test a webhook target or try a public API while reading its docs. For one-off checks it is faster than opening a full API client.

How it works

The tool uses the browser's fetch API to send your request. The response status, headers and body are then displayed, with JSON formatted for reading. Because the request comes from your browser, the target server must allow cross-origin requests (CORS). If it does not, you will see a network error even though the API itself is fine.

Frequently asked questions

Why do I get a CORS or network error?

Browsers block cross-origin requests unless the server allows them. This is a server-side rule, not a problem with your request. Public APIs that support CORS will work. For others, use a tool like curl.

Are my requests stored?

No. Requests go directly from your browser to the target. This site does not proxy or log them.

Which HTTP methods are supported?

The common ones: GET, POST, PUT, PATCH and DELETE, among others the browser allows.

Should I paste real API keys here?

The data is not sent to this site, but as a habit, use test keys when you can and avoid sharing your screen with secrets visible.