![]() How to encode Node.js response from scratch This project takes advantage of the learnings I shared in my previous posts, so I won't be covering those topics here: ![]() The full source code is available at the end of this post, so if you know what you're doing you can dive straight to it, if you're also learning enjoy the read. To further explore Node modules, visit their documentation page.LinkedIn logo for sharing a link Twitter logo for sharing a link Reddit logo for sharing a linkĪlright, for this one I'll be honest, it was not easy, because everywhere I looked there were solutions with third-party libraries or just partial theory information, and as you might already know, I'm learning Node.js and web technologies from scratch to know what's going on under the hood. Finally, we created a Node.js server for authenticating our user with a JWT token by signing it using the QR code secret coming from the frontend. We also learned how to encode data in different forms in a QR code, such as an SVG file. Whether we need to encode data for a web or mobile app, it can easily be achieved using the Node runtime environment. In this tutorial, we learned how to store and share information in a convenient and efficient way by using QR codes. Now that we have tested our server’s liveness, we can send requests to the login route from the frontend we built and authenticate our users. Open your terminal and run the following command: curl -I The output should look like this: We can test it in many ways, such as with Postman or Thunder Client, but I will use a curl request. Let’s test our server by hitting the test route that we previously configured. To run the server, first add the following code in the scripts objects located in package.json: "start": "nodemon index.js", QRCode.toFile('/output-file-path/file.png', 'Encode this text in QR code'. ![]() Here is an example of how to use the toFile method to generate a QR code image file: // _ Importing qrcode _ \\ This method takes a file path, the text to encode in the QR code, and an options object as arguments, and generates a QR code image file at the specified file path. To generate a QR code image, you can use the toFile method from the qrcode module. Open a terminal window and run the following command: npm install qrcode Generating QR code images Once you have Node.js and npm installed, you can install the qrcode library and its dependencies using npm. If you do not have these tools installed, you can download and install them from the Node.js website. ![]() To install the qrcode library, you will need to have Node.js and npm (the Node.js package manager) installed on your system. The qrcode library provides a simple API for writing QR codes.
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