index.js

const express = require('express');
const path = require('path');
const logger = require('morgan');
const cookieParser = require('cookie-parser');
const bodyParser = require('body-parser');
const helmet = require('helmet');
const app = express();
const http = require('http');

const transaction = require('./routes/transaction');
const address = require('./routes/address');
const block = require('./routes/block');
const core = require('./src/core');
core.start();

app.use(helmet());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
  extended: false
}));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use(function (req, res, next) {
  next();
});

app.use('/' + 'transaction', transaction);
app.use('/' + 'address', address);
app.use('/' + 'block', block);

// error handler
app.use(function (err, req, res, next) {

  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.json({
    status: 500,
    message: err.message
  });
});

app.set('port', 3000);


let server = http.createServer(app);

server.listen(3000);
server.on('error', onError);
server.on('listening', onListening);

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  let bind = typeof port === 'string' ?
    'Pipe ' + port :
    'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

function onListening() {
  let addr = server.address();
  let bind = typeof addr === 'string' ?
    'pipe ' + addr :
    'port ' + addr.port;
  //debug('Listening on ' + bind);
}