linenotify_with_image.js

var fs = require('fs');
var request = require('request');

var formData = {
  message: 'test message',
  imageFile: fs.createReadStream('/file/path.jpeg'),
};
var options = {
  method: 'POST',
  url: 'https://notify-api.line.me/api/notify',
  headers: {
    'Authorization': 'Bearer ===YOURTOKEN==='
  },
  formData: formData
};

function callback(error, response, body) {
  if (!error && response.statusCode == 200) {
    var info = JSON.parse(body);
    console.log('Upload successful!  Server responded with:', info);
  } else {
    return console.error('upload failed:', error);
  }
}

request(options, callback);