How to get an access_token from AWS Cognito using Axios

get_access_token.js

// Get AWS Congito access token using node-fetch and axios
const axios = require('axios');
const fetch = require('node-fetch');
const url = 'https://REPLACE_ME.auth.ap-southeast-2.amazoncognito.com/oauth2/token';
const clientId = 'REPLACE_ME';
const clientSecret = 'REPLACE_ME';
const body = `client_id=${clientId}&client_secret=${clientSecret}&grant_type=client_credentials`

// with node-fetch

fetch(
    url,
    {
        method: 'post',
        body:    body,
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'Authorization': 'Basic ' + Buffer.from(clientId + ":" + clientSecret).toString('base64')
        },
    }
).then(
    res => res.json()
).then(
    json => console.log(json)
);

// with axios

axios.post(
    url,
    body,
    {
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'Authorization': 'Basic ' + Buffer.from(clientId + ":" + clientSecret).toString('base64')
        },
    })
    .then(function (response) {
        console.log(response.data.access_token);
    })
    .catch(function (error) {
        console.log(error);
    });