Authentication Made Simple: Exploring QR Auto Login in Flutter
Tags: flutter, appdevelopment, crossplatform
Published: 2024-05-02 08:05:35


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Technology is evolving daily. The more technology advances, the more people rely on QR codes. Very few businesses are left that still need to implement QR. General users also rely on QR codes, finding them a secure and easy payment gateway.

QR codes are widely recognized because of the automation process, verified and easy authentication on different platforms, and for storing URLs, text, emails, contact numbers, or other necessary forms of data. Many businesses also want to [hire flutter developer](https://flutteragency.com/hire-flutter-developer/) to implement this process in their businesses for their users. QR codes have made the auto-scanning and login processes easier than ever.

## What Is The Working Process Of the QR Code?

Almost 90 people out of 100 have watched QR codes at some point in their lives. But do you know how it works? A QR code looks like a square grid with black dots and squares on a white background. Each QR code is different and processed with Reed-Solomon error correction. Open your mobile camera and place it all in the QR Code. As a result, it automatically translates it and shows the required content. There are different format storing options available in QR; for example - numeric, alphanumeric, byte, binary, and kanji.

QR codes help in different business projects. Businesses get help in product tracking, time tracking, product identification, document identification, and linking the same document with specific products. A scanned QR code also helps with access control during file entries. QR codes have become a major solution for businesses' contactless project handling. 

## QR Code Common Applications

QR codes are extremely beneficial for business purposes. From conveying business messages to sharing information with clients, the application field of QR is broad. Hire Flutter developers for the most authentic ways of real-time QR application. 

**Directing Consumers To Your Business Landing Page:** When you start using QR codes for business, it becomes easier than ever for your business to guide consumers to the landing page just by scanning a code. It is considered an effective marketing technique.

**Location Adding:** Adding locations of shops, offices, homes, or any business place to a QR Code gives the most simple navigation to the users. 

**Works As an Access Controller:** Users can easily attach a QR code at any entry point after scanning the code and get access to enter by generating and sending OTP.  

**What Are Some Key Features of QR Codes?**
The QR justifies its name: Quick Response. In the modern tech world, QR has been used in almost every field, and individuals and businesses are getting a huge advantage from this QR code. 

**QR Codes Are Safe** 
Business communications with consumers are a basic need for continuation. QR codes are highly effective for businesses and have been used in different sectors to provide consumer data and information. Consumers can also fill out all the confidential information securely. 

**QR Codes Are Quick**
QR is a great option for streamlining business operations and the user experience. It also ensures consumers get the necessary data access quickly and efficiently. Additionally, consumers can directly check in on the landing page without asking for any support.

**QR Works As a Data Holder** 
QR has a significant place to store consumer data. It holds much-encrypted information that converts into URLs, connects to different offers and landing pages, and shares remarkable market information. 

**How a QR Code Works in Flutter?**
QR Codes allow businesses to easily integrate their website or business application. Businesses often hire flutter developer to execute these tasks well. 

At first, a simple project in Flutter gets created.  
In the pubspec. yml file. Put the Flutter QR code package
Then, the pre-generated code gets removed in the main. dart file.
Then there is a file generated in_qr_code. dart file.
Then, create and add the qr_image. dart file.

As a next step, it gets imported to the Flutter QR Code package in the form of qr_image.dart file
Then, the generated QR code is ready to use once scanned. Businesses can test this with a real device by scanning the generated QR code. This takes you to the link you pasted before creating the QR code.

## Steps by Step Processes for QR Auto Login In Flutter
Have you considered how easy and interesting it is to log in from different devices without using any messages, passwords, PINs or email? Different business apps use QR codes to log in from one logged-in device to another. It can easily be done with Flutter too. Yes, you can easily set up your project with Flutter or hire Flutter developer for a business venture. 

**Platform Set Up** 
Whenever a platform gets support from Flutter, it needs a particular set of parameters. You must create Firebase Messaging, including Web..., which contains numerous small setups such as this "firebase-messaging-sw.js" file. 

It is necessary to follow all the steps, and then you can see the Firebase (flutter-fire) CLI installation. It is called "firebase_options.dart". It gets generated automatically, and users can use it. It allows the quick deployment of Firebase inside the Flutter App. 

**Push Notifications**
There are a few different approaches to checking. Below, we are mentioning a particular one. You'll see a "Constants.authKey" variable. Remember, you have to collect yours from the Firebase Console. It is known as the Server key.

The QR Code is generated using the Token data, and you can check it from the logged device. Then, a Push Notification will be sent to the device on which the users are waiting to be logged.  You can also check here [Flutter firebase user authentication](https://flutteragency.com/flutter-firebase-user-authentication-using-phone-number/) using phone number.

**Take a look :**
Waiting for the Push Notification, the device generates a QR code and then waits.

The device gets logged, the QR Code reading is done, the token is generated, and a notification is sent with the custom token.  

Once users have the device token to determine sending the Push Notification, the custom token gets logged in automatically without credentials. Thus, the process is done. 

Once the scanning of the QR Code is done, this screen disappears, and the push notification is sent. This can be added to any QR login by using the Flutter app. 

## Conclusion
The QR code of Flutter and auto-login have made business tasks easier. But, QR code generation is challenging for individuals. If you are a non-technical person, it would be better to hire Flutter developer because they know how to generate code in the most simplified way and efficiently. For more updates and details, visit us [https://flutteragency.com/](https://flutteragency.com/).