base64 encode a file with node.js and auto-detect the mimetype.

node-base64-encode.js

// to run: node node-base64-encode.js file
const mime = require('mime'); // npm install mime
const path = require('path');
const fs = require('fs');

// path to the file we passed in
const filepath = path.resolve(process.argv[2]);

// get the mimetype
const filemime = mime.getType(filepath);

fs.readFile(filepath, {encoding: 'base64'}, (err, data) => {
  if (err) {
    throw err;
  }
  console.log(`data:${filemime};base64,${data}`);
});

Thank you for the example.
As today, mime. lookup() function is renamed to getType()

@wenbolovesnz thanks for the heads up. Will update

Does it decodes the mimeType of Base64 string?