How to Configure Axios to Automatically Include Cookies in Requests to an Express.js Server?

Configuring Axios for Automatic Cookie Inclusion

Problem Statement:

When making HTTP requests from a client to an Express.js server using Axios, cookies set on the client are not automatically sent in requests. As a result, the server-side code cannot access those cookies for authentication or other purposes.

Solution: withCredentials Property

To resolve this issue, the Axios library provides the withCredentials property. Setting it to true enables cross-site request forwarding (CORS) credentials, allowing Axios to include cookies in its requests.

axios.get(`some api url`, { withCredentials: true });

This property can be applied to individual Axios requests or set as a default for all requests:

// Force credentials for all Axios requests
axios.defaults.withCredentials = true;

// Use credentials for a specific Axios request instance
const instance = axios.create({
  withCredentials: true,
  baseURL: BASE_URL
});
instance.get('/todos');

By setting withCredentials to true, CORS credentials are enabled, ensuring that cookies are automatically sent in Axios requests to the configured domain. This allows server-side code to access and utilize those cookies for session management, authentication, or any other necessary purpose.

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