Send POST Request Online (Instant, Free, No Login) | REST Client

Test any API in your browser—no signup or install. Just send.

Need to send a POST request or test an API online? Use this free online request sender and online rest client—no curl, no Postman, no install. You can send a POST request online right in your browser with Send Web Request. If you're looking for a Postman test online alternative, just enter your URL, set the method to POST, add your body, and hit Send.

When to use POST

POST is used to create new resources or submit data to a server. When you sign up, add an item to a cart, or create a new record in an API, that's usually a POST request. Unlike GET, POST sends data in the request body, so it can include large payloads and sensitive information without putting it in the URL.

Sending JSON in a POST request

Most modern APIs expect JSON. Set the Content-Type header to application/json and put your JSON object in the body. For example, to create a new user:

POST https://api.example.com/users
Content-Type: application/json

{
  "name": "Jane Doe",
  "email": "jane@example.com",
  "password": "secure123"
}

Sending form data

Sometimes you need to send form-encoded data instead of JSON. Use Content-Type: application/x-www-form-urlencoded and format the body as key=value pairs:

POST https://api.example.com/form
Content-Type: application/x-www-form-urlencoded

username=jane&email=jane@example.com&action=subscribe

Authorization headers

APIs often require authentication. Add an Authorization header with your token. For Bearer tokens: Authorization: Bearer YOUR_TOKEN. For Basic auth: Authorization: Basic base64(username:password). Send Web Request lets you add any header you need.

Common POST request errors

If your POST request fails, the status code tells you why. 400 Bad Request usually means the body is missing, malformed, or doesn't match what the API expects—check your Content-Type and that the body is valid JSON or form-encoded. 401 Unauthorized means the server requires authentication: add an Authorization header (e.g. Bearer token). 415 Unsupported Media Type means the server didn't accept the body format—set Content-Type to application/json (or the format the API expects) and ensure the body matches. See our status code guide (/docs/status-codes) for more.

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