Why Axios interceptors in Vue? - Purpose & Use Cases

The Big Idea

What if you never had to repeat your API setup code again?

The Scenario

Imagine you have to add a token to every API request and handle errors manually in every single call across your Vue app.

The Problem

Manually adding headers and error handling everywhere is repetitive, easy to forget, and makes your code messy and hard to maintain.

The Solution

Axios interceptors let you automatically modify requests and responses in one place, so you don't repeat code and can handle errors globally.

Before vs After

✗ Before

axios.get('/data', { headers: { Authorization: 'token' } }).catch(err => handleError(err));

✓ After

axios.interceptors.request.use(config => { config.headers.Authorization = 'token'; return config; });

What It Enables

You can centralize request and response logic, making your app cleaner, more reliable, and easier to update.

Real Life Example

In a Vue app, you can refresh expired tokens automatically before requests and show a global error message if the server is down.

Key Takeaways

Manually adding headers and error handling everywhere is tedious and error-prone.

Axios interceptors let you handle these tasks in one place.

This leads to cleaner, more maintainable Vue applications.