Insomnia: The Open-Source API Client for GraphQL, REST, and More

Insomnia: The Open-Source API Client for GraphQL, REST, and More

Summary

Insomnia is a powerful open-source, cross-platform API client designed for GraphQL, REST, WebSockets, SSE, and gRPC. It offers robust features for debugging, designing, testing, and mocking APIs, supporting various storage options including local, Git, and cloud sync. This versatile tool helps developers streamline their API development workflows efficiently.

Repository Info

Updated on April 21, 2026
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Tags

API ClientGraphQLREST APIWebSocketsgRPCTypeScriptAPI DevelopmentDeveloper Tools

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Introduction

Insomnia is a comprehensive, open-source, and cross-platform API client that supports a wide range of protocols, including GraphQL, REST, WebSockets, Server-Sent Events (SSE), and gRPC. Developed by Kong, Insomnia provides a robust environment for the entire API lifecycle, from debugging and designing to testing and mocking. It offers flexible storage solutions, allowing users to keep their projects locally, sync with Git repositories, or collaborate via cloud sync, with optional end-to-end encryption.

Installation

Getting started with Insomnia is straightforward. The application is available for Mac, Windows, and Linux. You can download the latest version directly from the official website:

https://insomnia.rest

Examples

Insomnia empowers developers to perform a wide array of API-related tasks, streamlining their workflow:

  • Debug APIs: Send requests and inspect responses for various protocols.
  • Design APIs: Utilize the native OpenAPI editor with visual previews to craft API specifications.
  • Test APIs: Create and run native test suites and collection runners to ensure API functionality.
  • Mock APIs: Set up cloud or self-hosted mocking servers for development and testing without a live backend.
  • Build CI/CD pipelines: Integrate with the native Insomnia CLI for linting and testing within automated pipelines.
  • Collaborate with others: Leverage built-in features for team collaboration on API projects.
  • Extend functionality: Utilize a rich ecosystem of third-party plugins to customize and enhance the client.

Why Use Insomnia?

Insomnia stands out as a preferred API client for several reasons:

  • Versatile Protocol Support: It handles modern API protocols like GraphQL, gRPC, and WebSockets alongside traditional REST and SSE, making it a one-stop solution.
  • Comprehensive API Lifecycle Management: From initial design and debugging to testing and mocking, Insomnia covers all stages of API development.
  • Flexible Storage Options: Users can choose between 100% local storage (Local Vault), Git-based synchronization (Git Sync), or cloud collaboration (Cloud Sync), providing control over data residency and security.
  • Open-Source and Cross-Platform: Being open-source, it benefits from community contributions, and its availability across major operating systems ensures broad accessibility.
  • Developer-Friendly Features: Features like the OpenAPI editor, test suites, CLI integration, and a plugin ecosystem enhance developer productivity and customization.
  • Collaboration Capabilities: Facilitates team work with features designed for sharing and managing API projects effectively.

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