Insomnia is a free, open-source REST API client used to design and test REST, GraphQL, and SOAP APIs


Insomnia helps users design, debug, and test RESTful APIs and GraphQL APIs. Its clean and intuitive interface, combined with robust features, makes it a popular choice among developers who require a reliable tool for API automation. Insomnia supports various authentication methods, environment variables, and advanced request configurations, providing a comprehensive solution for API testing needs.


Insomnia offers a wide range of features that make it a formidable tool for API automation and testing:

  1. Support for REST and GraphQL APIs: Insomnia supports both RESTful and GraphQL APIs, enabling users to test and debug a variety of endpoints and services.
  2. Environment Variables: Users can define and manage environment variables to easily switch between different environments (e.g., development, staging, production), streamlining the testing process.
  3. Authentication Methods: Insomnia supports multiple authentication methods, including Basic Auth, Bearer Token, OAuth 1.0a, OAuth 2.0, and API Keys, ensuring secure access to APIs.
  4. Request Chaining: Users can chain requests together, allowing the response from one request to be used as input for subsequent requests. This feature is particularly useful for complex testing scenarios.
  5. Customizable Headers and Parameters: Insomnia allows users to add custom headers and query parameters to their requests, providing greater control over the request configuration.
  6. GraphQL Query Support: With built-in GraphQL support, users can write and test GraphQL queries and mutations, viewing responses in a structured format.
  7. Plugins and Extensions: Insomnia supports plugins, allowing users to extend its functionality with custom scripts and integrations. This makes it highly adaptable to specific needs.
  8. Response Visualization and Formatting: The tool provides detailed visualizations of API responses, including support for JSON, XML, and HTML, making it easier to interpret and analyze data.
  9. Request History and Collections: Insomnia keeps a history of all requests and allows users to organize them into collections, facilitating better organization and repeatability.
  10. Collaboration Features: With Insomnia’s cloud synchronization, teams can collaborate on API tests by sharing collections and environments, ensuring consistency across different team members.


Insomnia offers several advantages that make it a preferred choice for many developers:

  1. User-Friendly Interface: Its clean and intuitive interface makes it easy to use, even for those new to API testing, reducing the learning curve significantly.
  2. Open Source and Free: As an open-source tool, Insomnia is free to use, which makes it accessible to a wide range of users, from individual developers to large organizations.
  3. Flexibility and Customization: The ability to use plugins and extensions allows users to customize Insomnia according to their specific needs, enhancing its flexibility.
  4. Extensive Authentication Support: With support for multiple authentication methods, Insomnia ensures that users can securely access and test various APIs.
  5. Environment Management: The tool’s environment variable management simplifies the process of switching between different testing environments, enhancing productivity.
  6. GraphQL Support: Built-in GraphQL support makes it easier for developers working with GraphQL APIs to write and test queries and mutations.
  7. Collaborative Capabilities: Cloud synchronization and sharing features promote collaboration among team members, ensuring that everyone is on the same page.


Despite its strengths, Insomnia has some limitations:

  1. Limited Advanced Features: While Insomnia covers the basics well, it lacks some advanced features found in more comprehensive tools like Postman, such as extensive automation and scripting capabilities.
  2. Performance with Large Data Sets: Insomnia can struggle with performance issues when handling very large responses or datasets, which can be a drawback for some use cases.
  3. Fewer Built-In Integrations: Compared to other tools, Insomnia has fewer built-in integrations with CI/CD pipelines and other development tools, which may require additional setup for automation.
  4. Limited Load Testing Capabilities: Insomnia does not support load testing, which could be a drawback for users needing to evaluate the performance of their APIs under stress conditions.
  5. Dependency on External Plugins: While plugins add to its flexibility, Insomnia’s reliance on external plugins for extended functionality can sometimes lead to stability issues or compatibility problems.

Using Insomnia for API testing is straightforward. Here’s a simple example of how to use Insomnia to test a REST API:

Creating a Request:

  1. Open Insomnia and click on the "New Request" button.
  2. Enter the request name and select the request type (e.g., GET).
  3. Enter the URL of the API endpoint (e.g.,
  4. Click on the “Send” button to execute the request.

Adding Headers and Parameters:

  1. To add headers, click on the “Headers” tab and enter the key-value pairs for the headers.
  2. To add query parameters, click on the “Query” tab and enter the key-value pairs for the parameters.

Using Environment Variables:

  1. Define environment variables by clicking on the gear icon in the top right corner and selecting “Manage Environments.”
  2. Create a new environment and add variables (e.g., baseUrl with value
  3. Use the variables in your request URL (e.g., {{ baseUrl }}/posts).

Example Request with Authentication:

  1. Choose the authentication method from the “Auth” tab (e.g., Bearer Token).
  2. Enter the required authentication details (e.g., token).
  3. Send the request and view the authenticated response.



Insomnia offers different pricing tiers to accommodate various needs:

  1. Free Version: The open-source version of Insomnia is free to use, providing access to core features suitable for individual developers and small teams.
  2. Insomnia Plus: Priced at $5 per user per month, Insomnia Plus includes additional features such as cloud synchronization and sharing capabilities, making it suitable for teams that need collaborative functionalities.
  3. Insomnia Teams: Designed for larger teams, this plan is priced at $8 per user per month and includes all features of Insomnia Plus, along with advanced team management and enhanced security features.

Insomnia is recommended for:

  1. Individual Developers: Its simplicity and ease of use make it ideal for individual developers looking for a quick and efficient way to test APIs without the need for extensive setup.
  2. Small to Medium-Sized Teams: Small and medium-sized teams can benefit from Insomnia’s collaborative features and environment management capabilities, enhancing productivity and consistency.
  3. Developers Working with GraphQL: Insomnia’s built-in support for GraphQL makes it an excellent choice for developers working with GraphQL APIs, providing tools to write and test queries and mutations effectively.
  4. Open-Source Enthusiasts: Developers who prefer open-source solutions will appreciate Insomnia’s transparency, community-driven development, and the ability to contribute to its growth.
  5. Projects with Basic to Intermediate Testing Needs: For projects that do not require advanced automation, extensive scripting, or load testing, Insomnia provides a robust and efficient solution.


Insomnia stands out as a versatile and efficient tool for API testing and automation. Its user-friendly interface, combined with a robust set of features, makes it a valuable asset for developers and QA professionals. While it may not offer all the advanced capabilities of more comprehensive tools like Postman, its focus on simplicity, speed, and accessibility makes it an excellent choice for many use cases.

Whether you are an individual developer, part of a small team, or an open-source enthusiast, Insomnia provides the tools you need to interact with APIs effectively and efficiently.

About the author
Irfan Ahmad

Irfan Ahmad

Software Quality Leader | Helping software teams to deliver with speed, security and scale.

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