example sync file api in node/express

index.js

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

var app = express();
var port = process.env.PORT || 8080;

app.get('/api', function(req, res) {
  var contents = fs.readFileSync('DATA.txt', 'utf8');
  res.send("test info: " + contents);
});

app.listen(port);
console.log('Server started! At http://localhost:' + port);