Axios is not defined

I know this might seem obvious but make sure there is a reference at the top of your file to the correct axios or install it https://www.npmjs.com/package/axios

<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

i think first u have to install npm install axios --save then import it in app.js file

import axios from "axios";

I forgot to import axios. I added to the top of my script:

import axios from 'axios';

I also forgot to install axios. I installed axios via npm using:

npm i axios --global 
// --global flags will save you the stress of insstalling axios again.

That solved my error.