几行代码搭建一个二维码服务

[manxingxing]

const express = require('express');
const app = express();
var QRCode = require('qrcode');

app.get('/', function (req, res) {
  let {data, w} = req.query;
  let width = 150;
  if (!data) {
    res.status(400).end();
    return
  }

  if (w) {
    width = parseInt(w, 10);
  }
  QRCode.toFileStream(res, data, { width: width, margin: 2 })
});

app.listen(4000, () => {
  console.log('listening on port 4000');
});