Insomnia

Insomnia helps developers build and troubleshoot APIs from a Windows desktop. They can compose calls to HTTP, REST, GraphQL, gRPC, and SOAP services, then review the returned data and headers. It also supports WebSocket connections and server-sent events. Teams can use it to explore endpoints, check expected behavior, and keep related requests in collections during development.

Keep API requests, checks, and specifications together while working with local files, Git, or shared storage.

Requests and tests can be grouped into collections and run with scripts before or after each call. OpenAPI documents can guide API design, while mock endpoints provide sample behavior before a service is ready. Work can be kept on the computer, tracked through Git, or synchronized online. The client also offers tools for examining MCP servers and connecting to Kong Konnect catalogs.

Features:

• Send requests across HTTP and GraphQL services
• Run collection checks with request scripts
• Create mock responses from API definitions
• Review WebSocket traffic and server-sent events
• Save projects locally or through Git
• Examine MCP server tools and prompts