Course Overview

What is NFC? An Introduction to NFC Tags, Cards, and Readers

Introduction

Tag Counter Game App

Set up a React Native NFC iOS and Android App

An Introduction to the React Native NFC Module Library

How to Build an iOS NFC Tag Scanner App With React Native

How to Build an Android NFC Tag Scanner App With React Native

App1 Conclusion

Tag-Counter Game App

Tap-And-Go App

How to Code an NDEF Message With the NFC Tools App

A Deep Dive Into NDEF and NdefRecord to Share Data via NFC

Tap-And-Go Project Setup With React Native and NFC Manager

How to Read NFC Tags and Write NDEF Data With NfcManager

How to Build a Website NFC Tag And Use Deep Linking With NFC

App2 Conclusion

Tap-And-Go  App

NFC Pokemon App

The User Flow of an NFC Tag Reader and Writer App

Intro to Type 2 NFC Tags: Read and Write NFC Tags With React

How to Sign and Verify NFC Data With React Native and elliptic

How to Add Memory Protection to NFC Tags For Copy Protection

App3 Conclusion

NfcPokemon  App

react

react-native

react-native-elements

react-native-nfc-manager

react-native-paper

## What we will cover in this course

First, I will provide an overview of NFC technology, so you can understand basic concepts and terms. After that, we will build three apps throughout this course.

### App 1: Tag Counter

![image](https://user-images.githubusercontent.com/10307875/148626752-38646752-bb16-4db2-8324-9fc19efdef04.png)

App 1 is a game app to count how much time a user needs to scan five NFC tags. You will learn:
- how to properly set up an NFC project 
- how to trigger NFC scanning
- the difference from iOS and Android regarding NFC feature

### App 2: Tap-and-Go

![image](https://user-images.githubusercontent.com/10307875/148627270-2dc43df8-8d5c-479d-8dd6-041b236d7009.png)

App 2 is about NFC Data Exchange Format (NDEF), which is the standard NFC data format supported by both iOS and Android. NDEF can be used for almost any NFC tag. We will build an NDEF reader-writer app, and you will learn:
- how to write specific NDEF URI into NFC tags 
- how to read NDEF URI and trigger corresponding actions, for example, opening an URL, making a phone call, or sending a message. 
- how to use deep linking with NFC tags.

### App 3: NFC Pokemon

![image](https://user-images.githubusercontent.com/10307875/148627203-562e742d-973e-406c-8e9e-a871ccdaf6d9.png)

App 3 dives into low-level NFC programming, which directly manipulates the NFC tag’s internal memory and uses proprietary NFC commands. 
The app we'll build is called "NFC Pokemon," which is a digital identity management platform. It can seal a specific Pokemon, for example, a Pikachu, into an NFC tag. 

When building this app, you will learn:
- how to use low-leve tag command to directly manipulate NFC tag's internal memory
- how to create digital signatures in React Native
- how to use proprietary password protection command for NXP NTAG 213 / 215

NFC technology is everywhere in our daily life, from transportation, access control, to payment system. However, understanding NFC is still a hard topic because of its wide technology landspace. 

So in this course, We will guide you from the simplest case like using common NDEF format, all the way to a complex digital identity management app which leverages some unique NFC features.

The newline Guide to NFCs with React Native

How to integrate NFC feature into your React Native app

How to handle the differences between Android and iOS regarding NFC feature

Understand NDEF and use it across iOS and Android

Understand low-level NFC programming and communicate with NFC tags directly

How to use asymmetric cryptography library with React Native

How to use password protection commands from NTAG 21x NFC tags

In this lesson, we're going to write our first NDEF message into NFC tags. The intention is to give you an idea of how the NDEF message is created and used.

We will:
1. write our first NDEF message using a third-party app
2. read it back and print the content out using our previous TagCounter app
3. write a test case to decode the NDEF message inside it

The app we will use is "NFC Tools". You can easily find it in the App Store or Google Play Store.

Come back to the previous screen and press 

Before we print it out using our own app, we try to scan this NFC tag without launching any app.

As you can see, the operating system itself automatically discovers this tag, and it also understands the content in our tag is actually a web link to "reactnative.dev".

Click it. It successfully launches the React Native website.

This little experiment tells us that our operating system understands NDEF and can even take actions depending on the content inside the NDEF.

Then, go back to our previous TagCounterGame project. In the event listener of our 

React.useEffect(() => {
    let count = 5;
    NfcManager.setEventListener(NfcEvents.DiscoverTag, (tag) => {
      console.warn(JSON.stringify(tag)); // <--- Add this line!
      count--;

      ...
    });

    return () => {
      NfcManager.setEventListener(NfcEvents.DiscoverTag, null);
    };
  }, [start]);

As we have seen before, this tag object contains a "NdefMessage" property.

 variable, and the value will be the data we just printed out.

---
title: How to Code an NDEF Message With the NFC Tools App
isPublicLesson: false
privateVideoUrl: https://fullstack.wistia.com/medias/ivfisifbdg
---

In this lesson, we're going to write our first NDEF message into NFC tags. The intention is to give you an idea of how the NDEF message is created and used.

We will:
1\. write our first NDEF message using a third-party app
2\. read it back and print the content out using our previous TagCounter app
3\. write a test case to decode the NDEF message inside it

## Writing NDEF using NFC tools

The app we will use is "NFC Tools". You can easily find it in the App Store or Google Play Store.

After installing the app, launch it, `press write > add a record > URL`, 

Let's write "<https://reactnative.dev>" into it.

Come back to the previous screen and press **write**.

Before we print it out using our own app, we try to scan this NFC tag without launching any app.

As you can see, the operating system itself automatically discovers this tag, and it also understands the content in our tag is actually a web link to "reactnative.dev".

Click it. It successfully launches the React Native website.

This little experiment tells us that our operating system understands NDEF and can even take actions depending on the content inside the NDEF.

## Print out the data

Then, go back to our previous TagCounterGame project. In the event listener of our `Game` component, print out the tag object.

```javascript
React.useEffect(() => {
    let count = 5;
    NfcManager.setEventListener(NfcEvents.DiscoverTag, (tag) => {
      console.warn(JSON.stringify(tag)); // <--- Add this line!
      count--;

      ...
    });

    return () => {
      NfcManager.setEventListener(NfcEvents.DiscoverTag, null);
    };
  }, [start]);
```

As we have seen before, this tag object contains a "NdefMessage" property.

## Write a test to parse the data

Still in our `TagCounterGame` project, create a `ndef.test.js` file in the `__tests__` directory.

Create a `testData` variable, and the value will be the data we just printed out.

Then, quickly write a test case. Our objective is to successfully decode our data into "<https://reactnative.dev">, so it should be the expected value.

Run the test case with watch mode, and it fails immediately. This is expected since we haven't written any actual parsing logic yet. 

Learn

The newline Guide to Building Your First GraphQL Server with Node and TypeScript

Teach

Amelia Wattenberger

Author of Fullstack D3

Community

The newline Guide to NFCs with React Native

Module 1: Introduction

Introduction:

Start Here

Lesson 1: (5:40)

Course Overview

Lesson 2: (10:37)

What is NFC? An Introduction to NFC Tags, Cards, and Readers

Module 2: Tag-Counter Game App

Lesson 1: (1:41)

Tag Counter Game App

Lesson 2: (11:10)

Set up a React Native NFC iOS and Android App

Lesson 3: (7:42)

An Introduction to the React Native NFC Module Library

Lesson 4: (10:03)

How to Build an iOS NFC Tag Scanner App With React Native

Lesson 5: (16:36)

How to Build an Android NFC Tag Scanner App With React Native

Lesson 6: (3:14)

App1 Conclusion

Module 3: Tap-And-Go App

Lesson 1: (1:40)

Tap-And-Go App

Lesson 2: (7:10)

How to Code an NDEF Message With the NFC Tools App

Lesson 3: (9:30)

A Deep Dive Into NDEF and NdefRecord to Share Data via NFC

Lesson 4: (11:46)

Tap-And-Go Project Setup With React Native and NFC Manager

Lesson 5: (18:19)

How to Read NFC Tags and Write NDEF Data With NfcManager

Lesson 6: (12:28)

How to Build a Website NFC Tag And Use Deep Linking With NFC

Lesson 7: (3:57)

App2 Conclusion

Module 4: NfcPokemon App

Lesson 1: (2:12)

NFC Pokemon App

Lesson 2: (6:51)

The User Flow of an NFC Tag Reader and Writer App

Lesson 3: (17:20)

Intro to Type 2 NFC Tags: Read and Write NFC Tags With React

Lesson 4: (17:29)

How to Sign and Verify NFC Data With React Native and elliptic

Lesson 5: (14:48)

How to Add Memory Protection to NFC Tags For Copy Protection

Lesson 6: (4:30)

App3 Conclusion

How to Code an NDEF Message With the NFC Tools App