Head-to-Head: Polly.JS vs Mirage Analysis


v6.0.6(2 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 9Monthly npm downloads

@pollyjs/core is a JavaScript testing library that helps developers record, replay, and stub HTTP interactions. It can be integrated with any testing framework and provides a powerful API for testing network requests. With Polly.js, you can simulate scenarios like slow networks and server errors to ensure your application handles them gracefully. It also supports parallel testing and can be used in different environments, including browser testing and command-line tools. Its comprehensive documentation and plugin system make it easy to customize and extend its functionality.

Alternatives: nock, miragejs, msw

Tags: javascripttestinghttpnetwork-requestsmocking


v0.1.47(9 months ago)

This package is actively maintained.Types definitions are bundled with the npm packageNumber of direct dependencies: 26Monthly npm downloads

MirageJS is a client-side API mocking library used for testing and development. It provides an intuitive API for defining mock HTTP endpoints, request fixtures, and response data. MirageJS is popular among developers as it eliminates the need for backend integration for testing purposes. It also allows you to simulate failures, test edge cases, and test your application's behavior under different network conditions.

Alternatives: jest, cypress, nock

Tags: javascripttestingdevelopmentmockingapi



MirageJS is a popular package that has gained significant popularity in the JavaScript community due to its powerful mocking and API testing capabilities. It has a growing user base and an active community. On the other hand, @pollyjs/core, although less popular, is also widely used for browser automation testing, API recording, and mocking.

Features and Functionality

Both @pollyjs/core and MirageJS provide similar functionality in terms of mock server creation, API recording, and playback. However, MirageJS offers more extensive mocking and testing capabilities out-of-the-box, including data seeding, factory support, and GraphQL support. @pollyjs/core, on the other hand, focuses more on browser automation testing and provides additional features like request interception, request modification, and response manipulation.


Both packages can be easily integrated into different JavaScript frameworks and libraries. MirageJS is primarily designed for use with front-end frameworks like React, Ember, and Angular, while @pollyjs/core is more agnostic and can be used with any JavaScript application or test framework.

Developer Experience

MirageJS provides a comprehensive and intuitive API that makes it easy to set up and manage server mocks and API testing. It has good documentation and a helpful community. @pollyjs/core also offers a solid developer experience with a clear API and good documentation but may require a bit more configuration and setup for certain use cases.

Community Support and Maintenance

MirageJS has a strong and active community, which means you can find plenty of resources, tutorials, and community support. It is actively maintained and receives regular updates. @pollyjs/core also has an active community and is maintained by a dedicated team, ensuring its stability and reliability.