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@mswjs/interceptors

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@mswjs/interceptors

Low-level HTTP/HTTPS/XHR/fetch request interception library.

  • 0.37.1
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What is @mswjs/interceptors?

The @mswjs/interceptors package is a library for intercepting and mutating outgoing HTTP/HTTPS requests and WebSocket connections. It is primarily used for testing purposes, allowing developers to create mock servers and intercept network requests to return custom responses without having to alter the actual network infrastructure.

What are @mswjs/interceptors's main functionalities?

Intercepting HTTP/HTTPS requests

This feature allows you to intercept outgoing HTTP/HTTPS requests and return custom responses. The code sample demonstrates how to set up an interceptor for HTTP requests and provide a custom response with a mocked JSON body.

const { createInterceptor } = require('@mswjs/interceptors');
const { interceptClientRequest } = createInterceptor({
  modules: [require('@mswjs/interceptors/lib/interceptors/http')],
  resolver(request) {
    return {
      status: 200,
      body: JSON.stringify({ mocked: true }),
    };
  },
});
interceptClientRequest();

Intercepting WebSocket connections

This feature enables the interception of WebSocket connections, allowing you to monitor or mock WebSocket events. The code sample shows how to set up an interceptor for WebSocket connections and log the intercepted events.

const { createInterceptor } = require('@mswjs/interceptors');
const { interceptClientRequest } = createInterceptor({
  modules: [require('@mswjs/interceptors/lib/interceptors/ws')],
  resolver(event) {
    console.log('Intercepted WebSocket:', event);
  },
});
interceptClientRequest();

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Package last updated on 18 Nov 2024

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