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Nodejs implements a super simple method to generate QR codes

May 29, 2018 pm 04:37 PM

nodejs Generate QR code

This article mainly introduces the method of nodejs to achieve super simple generation of QR codes, and analyzes the related operation skills of nodejs based on the qr-image plug-in to generate QR codes in the form of examples. Friends in need can refer to it

The example in this article describes how nodejs implements a super simple method of generating QR codes. Share it with everyone for your reference, the details are as follows:

Use node-qrcode (https://github.com/soldair/node-qrcode) at the beginning, but you need to install it during the installation. python, and does not support python3.0 or above. When installing python2.0, you need to install other environments, so I gave up.

Finally chose a niche plug-inqr-image（https://github.com/alexeyten/qr-image）

The front page is as follows

views/index.ejs

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
  &lt;title&gt;&lt;%= title %&gt;&lt;/title&gt;
  &lt;link rel=&#39;stylesheet&#39; href=&#39;/stylesheets/style.css&#39;/&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;h1&gt;&lt;%= title %&gt;&lt;/h1&gt;
&lt;img src=&quot;/create_qrcode?text=http://blog.csdn.net/fo11ower&quot;/&gt;
&lt;/body&gt;
&lt;/html&gt;

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Backend code:

routes/index.js

var qr = require(&#39;qr-image&#39;)
router.get(&#39;/&#39;, function (req, res, next) {
  res.render(&#39;index&#39;, {title: &#39;Express&#39;});
});
router.get(&#39;/create_qrcode&#39;, function (req, res, next) {
  var text = req.query.text;
  try {
    var img = qr.image(text,{size :10});
    res.writeHead(200, {&#39;Content-Type&#39;: &#39;image/png&#39;});
    img.pipe(res);
  } catch (e) {
    res.writeHead(414, {&#39;Content-Type&#39;: &#39;text/html&#39;});
    res.end(&#39;&lt;h1&gt;414 Request-URI Too Large&lt;/h1&gt;&#39;);
  }
})

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Finally Effect

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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