TYPESCRIPT

node fetch image to base64

import fetch from 'node-fetch'
const res = await fetch(image)

const imgBody = `data:${res.headers.get('content-type')};base64,${(await res.arrayBuffer()).toString('base64')}`

nodejs read image as base64

const fs = require('fs');
const contents = fs.readFileSync('/path/to/file.jpg', {encoding: 'base64'});

nodejs read image as base64

const fs = require('fs').promises;
const contents = await fs.readFile('/path/to/file.jpg', {encoding: 'base64'});