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While working with Vue 3 and Laravel APIs, a common issue you might encounter is the “CSRF Token Mismatch” error. This problem arises when Axios, a popular HTTP client for making requests, fails to send the necessary X-XSRF-TOKEN in the request header. This article explains how to resolve this issue by intercepting requests and adding the required token.

Understanding the Problem

The Cross-Site Request Forgery (CSRF) Token Mismatch error typically occurs when a request is made from a local domain to a Laravel API. Laravel expects a CSRF token as a part of the request for security purposes. However, when Axios does not include this token in the header, Laravel rejects the request, leading to an error.

The Solution: Intercepting Requests with Axios

The solution lies in modifying the request before it’s sent. By using Axios’ request interceptors, you can ensure that the X-XSRF-TOKEN is included in every request header. Below is a step-by-step guide on how to implement this.

1. Setting Up Axios Instance

First, create an Axios instance with the necessary configurations:

import axios from 'axios';
import Cookies from 'js-cookie';

const httpApi = axios.create({
  baseURL: process.env.VUE_APP_API_URL,
  withCredentials: true,
  headers: {
    "X-Requested-With": "XMLHttpRequest",
  },
});

Here, withCredentials: true is crucial for sending cookies in cross-origin requests.

2. Adding a Request Interceptor

Next, add a request interceptor to Axios:

httpApi.interceptors.request.use(function (config) {
  const token = Cookies.get('XSRF-TOKEN');
  if (token) {
    config.headers['X-XSRF-TOKEN'] = token;
  }
  return config;
}, function (error) {
  return Promise.reject(error);
});

This interceptor function runs before each request is sent. It retrieves the CSRF token from the cookies using js-cookie and adds it to the request headers.

3. Exporting the Configured Axios Instance

Finally, export the configured Axios instance for use in your Vue components:

export { httpApi };

Conclusion

By intercepting requests and adding the X-XSRF-TOKEN header, you can smoothly integrate Vue 3 with a Laravel API without encountering CSRF Token Mismatch errors. This approach enhances the security of your application while ensuring seamless communication between the client and server.