From an API description
to an interactive interface.

Load an OpenAPI description and let Gramlot turn supported operations into forms. Fill in the parameters, preview a request and inspect the response—all in the browser.

An experiment for developers who want to explore and test APIs through a generated interface, in the spirit of Swagger UI.

See how it works Current availability

Gramlot API Explorer v2: operations on the left, generated product filters above a successful 200 OK response, with results in a table and JSON. — A real request to the prototype’s demo API. Browse products returns three products, shown as a table and as JSON. Select the image to view it at full size.

OpenAPI → Gramlot → live request

The schema becomes the starting point.

Instead of hand-writing a form for every operation, the explorer reads the API description and builds the interface with Gramlot.

01 / DISCOVER

Choose an operation.

Load an OpenAPI 3 JSON URL. Browse operations grouped by tag and select the endpoint you want to explore.

02 / PREPARE

Complete the generated form.

Enter path, query and header parameters or a JSON request body. Supported schema rules validate the values, with explicit controls for omission and null.

03 / INSPECT

Send it. Read the result.

Review the request before pressing Execute. Inspect the HTTP status, duration, headers and response body, with a table view for array results.

Working local prototype · Explorer v2

What is available today?

This page presents the current local prototype. A hosted interactive demo is not available yet. The screenshot shows its product catalogue example; the demo also includes reading a product by ID and calculating a quotation.

The current implementation supports internal schema references, common field types and JSON bodies. Nested objects and arrays use JSON editors rather than nested visual forms.

OpenAPI coverage is partial: external references, composed schemas, file uploads and generated OAuth flows are not supported. Requests run directly in the browser, so the target API must permit browser access through CORS.

Gramlot is pre-alpha. The first usable Gramlot release is planned for late 2026. This experiment has no separate release date.