const qr_image = require("qr-image");
app.get("/qrcode/txt", async (req, res, next) => {
const temp_qrcode = qr_image.image(req.query.text);
res.type("png");
temp_qrcode.pipe(res);
});
<img id="codeimg" src="http://localhost/qrcode/txt?text=http://www.baidu.com" width="160" height="160" />
原文：https://www.cnblogs.com/MrLee/p/9588976.html