Testing a single API request and documenting an entire API for other developers to consume are different jobs, but both are often reached for at the same point in a project — right after an endpoint starts working and before anyone else needs to use it.
Trying a request without installing a client
Not every API test needs a full desktop client with saved collections and environments — sometimes it's one request, checked once, right now. REST API Tester / cURL Generator sends the request directly from the browser and can also generate the equivalent cURL command for reuse in a script or terminal.
Turning a working API into documented API
Once endpoints are stable, the next problem is usually explaining them to whoever needs to consume the API — a teammate, a client, or future you. Swagger / OpenAPI Generator produces a standard OpenAPI specification that documentation tools, client generators and API gateways can all read.
Both run directly in the browser — the API tester talks straight to whatever endpoint you point it at, and nothing about the request or response passes through a third-party server first.
