Yaak Studio

The open-source desktop API client for REST, GraphQL, WebSocket, gRPC, with a real HTTP sender in-browser.

Yaak Studio — the open-source desktop API client for REST, GraphQL, WebSocket, gRPC, with a real HTTP sender in-browser.

How to use Yaak Studio

Pick an HTTP method and enter a URL with ${[ var ]} variables and :id path placeholders, then press Send
Switch environments between dev, staging and prod and watch the resolved URL update live
Add headers and URL parameters, choose a body type, and attach Basic, Bearer or API key auth
Inspect the response status, time, headers and body, and filter JSON with a JSONPath expression
Paste a cURL command on the Import tab to turn it into a real request, or copy the current request as cURL
Run template functions like uuid.v4, timestamp.unix and hash.sha256, then export the collection as JSON

Built on the real mountain-loop/yaak repo (MIT, 19,378 stars) with its exact methods, body types and settings
Real HTTP sender in the browser: GET, PUT, POST, PATCH, DELETE, OPTIONS, HEAD and QUERY with live responses
All 9 auth plugins covered: Basic, Bearer and API key send for real, OAuth 2.0 grant types shown exactly
All 7 importer plugins listed, with a working cURL importer and cURL exporter mirroring the repo copy plugin
All 15 template-function plugins listed, with live uuid, timestamp, random, hash, base64 and JSON generators
Environments with ${[ var ]} substitution across URL, headers and body, plus :id path placeholders and query params
Response viewer with status, timing, headers and a JSONPath filter, plus a 20-entry send history
Honest scope: gRPC, WebSocket, SSE, OAuth flows and keychain secrets need the Tauri desktop app

Yes, unlimited.