Resonance

Overview

Resonance is an API client, available on Windows and Linux.

Features described in its Flathub listing, in its GitHub repository and in its Winget manifest: offline use, Markdown support and keyboard shortcuts.

Services and protocols mentioned: MQTT.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

At a glance

All of Resonance is free: no feature is locked behind a paid plan, and its code is open.

Its licence (MIT) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

About

Resonance is a local-first, zero-account API client application designed to provide an excellent user experience for testing and interacting with web services. It offers a modern and intuitive interface for developers with powerful features for API development and testing. Key Features: REST/HTTP (HTTP/1.1 and HTTP/2) with all body modes, detailed timing breakdown and cookie display GraphQL with query and variables editors, schema introspection, an interactive query explorer and subscriptions over WebSocket gRPC with server reflection, local .proto files, all four RPC kinds and TLS/mTLS WebSocket, Server-Sent Events and MQTT connections with live status Import from OpenAPI 3.x, Swagger 2.0, Postman, Insomnia, HAR captures and cURL commands; export to OpenAPI Code generation in 9 languages and Markdown/HTML documentation generation Built-in mock server with response templating, custom bodies, status codes and delays Pre-request and test scripts in sandboxed JavaScript with a Postman-compatible pm API Collection runner with data files, request tags, run history and JSON/JUnit XML reports Response schema validation (JSON Schema drafts 4 to 2020-12) and JSONPath/XPath inspection Environments with variable templating and dynamic variables Bearer, Basic, API key, OAuth 2.0 with automatic refresh, Digest, NTLM and AWS Signature v4 authentication Client certificates (mTLS), keychain-backed secrets and HTTP/HTTPS/SOCKS proxy support Git-friendly collections stored as plain files, with the current branch shown in the sidebar Workspace tabs, request history with search and replay, and keyboard shortcuts for everything Light, dark and system themes with 9 accent colours Available in English, German, Spanish, French, Italian and Portuguese (BR)

Description from Flathub — AppStream (Flathub)