├── .gitignore
├── README.md
├── backend
├── .gitignore
├── package-lock.json
├── package.json
└── src
│ └── index.js
├── demo.gif
└── mobile
├── .env.example
├── .gitignore
├── app.json
├── app
├── (app)
│ ├── (auth)
│ │ ├── _layout.tsx
│ │ └── index.tsx
│ ├── _layout.tsx
│ └── sign-in.tsx
├── +html.tsx
└── _layout.tsx
├── assets
└── images
│ ├── adaptive-icon.png
│ ├── favicon.png
│ ├── icon.png
│ └── splash.png
├── babel.config.js
├── components
├── Header.tsx
├── SIWEAppKit.tsx
├── SIWEThirdweb.tsx
└── SIWEViem.tsx
├── index.js
├── package-lock.json
├── package.json
├── tsconfig.json
└── utils
├── SessionContext.tsx
├── useStorageState.ts
└── walletConnect.ts
/.gitignore:
--------------------------------------------------------------------------------
1 | # macOS
2 | .DS_Store
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # web3-react-native-siwe
2 |
3 | This repository showcases how to configure Sign-In With Ethereum (SIWE) on a React Native app, while validating the SIWE message in a Node.js backend.
4 |
5 | The React Native project is built with [Expo](https://expo.dev/), [Wagmi](https://wagmi.sh/), [Viem](https://viem.sh/) and [WalletConnect AppKit](https://docs.walletconnect.com/appkit/overview). The app asks the backend to validate the SIWE message and navigates to an authenticated route using Expo Router.
6 |
7 | Backend nonce generation and SIWE validation is also done using Viem.
8 |
9 | Two implementations are available to test:
10 |
11 | - Automatically through WalletConnect AppKit: after connecting the wallet, a WalletConnect modal will appear asking to sign in. This uses the configuration in `/mobile/utils/siweConfig.ts`
12 | - Manually through Viem: if the WalletConnect modal is dismissed, a green button appears to Sign In With Ethereum manually. This uses Viem manually, in `/mobile/app/index.tsx`
13 |
14 | 
15 |
16 | ## Requirements
17 |
18 | - [Expo environment setup](https://docs.expo.dev/get-started/installation/#requirements) (Node.js, Git, Watchman)
19 | - A [Wallet Connect Cloud](https://cloud.walletconnect.com/sign-in) project ID
20 | - Expo Go app installed in your smartphone
21 | - One or more web3 wallets installed in your smartphone (e.g. MetaMask, Rainbow Wallet, Trust Wallet, etc)
22 |
23 | ## Running the application
24 |
25 | Run `npm start` on both the `/backend` and `/mobile` directories.
26 |
27 | ### Backend
28 |
29 | - `cd backend`
30 | - `npm install`
31 | - `npm start`
32 |
33 | ### Mobile
34 |
35 | - `cd mobile`
36 | - Rename `.env.example` to `.env` and fill in your Wallet Connect Cloud project ID, and your computer's local IP
37 | - `npm install`
38 | - `npm start`
39 | - Open Expo Go app in your smartphone
40 | - If your smartphone is in the same network as your computer, the local dev server should appear as the first option. If it doesn't, use the app to scan the QR Code presented in the terminal
41 |
--------------------------------------------------------------------------------
/backend/.gitignore:
--------------------------------------------------------------------------------
1 | .DS_Store
2 | node_modules
3 |
--------------------------------------------------------------------------------
/backend/package-lock.json:
--------------------------------------------------------------------------------
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799 | "engines": {
800 | "node": ">= 0.8"
801 | }
802 | },
803 | "node_modules/toidentifier": {
804 | "version": "1.0.1",
805 | "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
806 | "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
807 | "engines": {
808 | "node": ">=0.6"
809 | }
810 | },
811 | "node_modules/type-is": {
812 | "version": "1.6.18",
813 | "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
814 | "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
815 | "dependencies": {
816 | "media-typer": "0.3.0",
817 | "mime-types": "~2.1.24"
818 | },
819 | "engines": {
820 | "node": ">= 0.6"
821 | }
822 | },
823 | "node_modules/uid-safe": {
824 | "version": "2.1.5",
825 | "resolved": "https://registry.npmjs.org/uid-safe/-/uid-safe-2.1.5.tgz",
826 | "integrity": "sha512-KPHm4VL5dDXKz01UuEd88Df+KzynaohSL9fBh096KWAxSKZQDI2uBrVqtvRM4rwrIrRRKsdLNML/lnaaVSRioA==",
827 | "dependencies": {
828 | "random-bytes": "~1.0.0"
829 | },
830 | "engines": {
831 | "node": ">= 0.8"
832 | }
833 | },
834 | "node_modules/unpipe": {
835 | "version": "1.0.0",
836 | "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
837 | "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
838 | "engines": {
839 | "node": ">= 0.8"
840 | }
841 | },
842 | "node_modules/utils-merge": {
843 | "version": "1.0.1",
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846 | "engines": {
847 | "node": ">= 0.4.0"
848 | }
849 | },
850 | "node_modules/vary": {
851 | "version": "1.1.2",
852 | "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
853 | "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
854 | "engines": {
855 | "node": ">= 0.8"
856 | }
857 | },
858 | "node_modules/viem": {
859 | "version": "2.16.3",
860 | "resolved": "https://registry.npmjs.org/viem/-/viem-2.16.3.tgz",
861 | "integrity": "sha512-6ExbIpi77C1HzGSjx6W+fn39Cz1ULlVV74XHxi1kYpOAqY7/iAoynK5X2aQp2LvxstTqS1GIKEdpCAZ8dKi2Ag==",
862 | "funding": [
863 | {
864 | "type": "github",
865 | "url": "https://github.com/sponsors/wevm"
866 | }
867 | ],
868 | "dependencies": {
869 | "@adraffy/ens-normalize": "1.10.0",
870 | "@noble/curves": "1.2.0",
871 | "@noble/hashes": "1.3.2",
872 | "@scure/bip32": "1.3.2",
873 | "@scure/bip39": "1.2.1",
874 | "abitype": "1.0.4",
875 | "isows": "1.0.4",
876 | "ws": "8.17.1"
877 | },
878 | "peerDependencies": {
879 | "typescript": ">=5.0.4"
880 | },
881 | "peerDependenciesMeta": {
882 | "typescript": {
883 | "optional": true
884 | }
885 | }
886 | },
887 | "node_modules/viem/node_modules/@adraffy/ens-normalize": {
888 | "version": "1.10.0",
889 | "resolved": "https://registry.npmjs.org/@adraffy/ens-normalize/-/ens-normalize-1.10.0.tgz",
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891 | },
892 | "node_modules/ws": {
893 | "version": "8.17.1",
894 | "resolved": "https://registry.npmjs.org/ws/-/ws-8.17.1.tgz",
895 | "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
896 | "engines": {
897 | "node": ">=10.0.0"
898 | },
899 | "peerDependencies": {
900 | "bufferutil": "^4.0.1",
901 | "utf-8-validate": ">=5.0.2"
902 | },
903 | "peerDependenciesMeta": {
904 | "bufferutil": {
905 | "optional": true
906 | },
907 | "utf-8-validate": {
908 | "optional": true
909 | }
910 | }
911 | }
912 | }
913 | }
914 |
--------------------------------------------------------------------------------
/backend/package.json:
--------------------------------------------------------------------------------
1 | {
2 | "name": "backend",
3 | "version": "1.0.0",
4 | "main": "index.js",
5 | "type": "module",
6 | "license": "MIT",
7 | "scripts": {
8 | "start": "node src/index.js"
9 | },
10 | "dependencies": {
11 | "cors": "^2.8.5",
12 | "express": "^4.18.2",
13 | "express-session": "^1.18.0",
14 | "viem": "^2.16.3"
15 | }
16 | }
17 |
--------------------------------------------------------------------------------
/backend/src/index.js:
--------------------------------------------------------------------------------
1 | import cors from "cors";
2 | import express from "express";
3 | import Session from "express-session";
4 | import { createPublicClient, http } from "viem";
5 | import { mainnet } from "viem/chains";
6 | import { generateSiweNonce, parseSiweMessage } from "viem/siwe";
7 |
8 | const app = express();
9 | app.use(express.json());
10 | app.use(cors({ credentials: true }));
11 | app.use(
12 | Session({
13 | name: "siwe-quickstart",
14 | secret: "siwe-quickstart-secret",
15 | resave: true,
16 | saveUninitialized: true,
17 | cookie: { secure: false, sameSite: true },
18 | })
19 | );
20 |
21 | app.get("/nonce", function (req, res) {
22 | res.setHeader("Content-Type", "text/plain");
23 |
24 | // Generate nonce
25 | const nonce = generateSiweNonce();
26 | console.log("[BACKEND] Generated nonce:", nonce);
27 |
28 | // Store nonce in session
29 | req.session.nonce = nonce;
30 |
31 | // Send back response
32 | res.status(200).send(nonce);
33 | });
34 |
35 | app.post("/verify", async function (req, res) {
36 | const { message, signature } = req.body;
37 |
38 | if (!message) {
39 | res.status(422).json({ message: "Expected SIWE message in body" });
40 | return;
41 | }
42 |
43 | // Create publicClient
44 | const publicClient = createPublicClient({
45 | chain: mainnet,
46 | transport: http(),
47 | });
48 |
49 | // Parse message
50 | const messageFields = parseSiweMessage(message);
51 |
52 | // Verify whether the signed message coming from the frontend is valid for the given address
53 | const valid = await publicClient.verifySiweMessage({
54 | message,
55 | signature,
56 | });
57 |
58 | console.log(`[BACKEND] SIWE Message valid: ${valid}`);
59 |
60 | if (valid) {
61 | // If the message is valid, store the message object in the session
62 | req.session.siwe = messageFields;
63 | req.session.cookie.expires = new Date(messageFields.expirationTime);
64 | } else {
65 | // If the message is not valid, clear the session
66 | req.session.siwe = null;
67 | req.session.nonce = null;
68 | req.session.save(() =>
69 | res.status(422).json({ message: "Invalid signature" })
70 | );
71 | return;
72 | }
73 |
74 | // Send back response
75 | res.status(200).send(valid);
76 | });
77 |
78 | app.get("/get_session", function (req, res) {
79 | if (!req.session.siwe) {
80 | res.status(401).json({ message: "You have to first sign_in" });
81 | return;
82 | }
83 |
84 | console.log("[BACKEND] User is authenticated!");
85 |
86 | res.setHeader("Content-Type", "text/plain");
87 |
88 | // Send back session data
89 | res.status(200).send({
90 | address: req.session.siwe.address,
91 | chainId: req.session.siwe.chainId,
92 | });
93 | });
94 |
95 | app.get("/sign_out", function (req, res) {
96 | // Clear session
97 | req.session.siwe = null;
98 | req.session.nonce = null;
99 | req.session.save(() => res.status(200).send(true));
100 | });
101 |
102 | app.listen(3000);
103 |
--------------------------------------------------------------------------------
/demo.gif:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/callstack/web3-react-native-siwe/414155201c0af811a18ca38e907dc4a442ae1506/demo.gif
--------------------------------------------------------------------------------
/mobile/.env.example:
--------------------------------------------------------------------------------
1 | EXPO_PUBLIC_WALLETCONNECT_CLOUD_PROJECT_ID="YOUR WALLET CONNECT CLOUD ID HERE"
2 | EXPO_PUBLIC_BACKEND_URL=http://your.ip.address.here:3000
3 |
--------------------------------------------------------------------------------
/mobile/.gitignore:
--------------------------------------------------------------------------------
1 | node_modules/
2 | .expo/
3 | dist/
4 | npm-debug.*
5 | *.jks
6 | *.p8
7 | *.p12
8 | *.key
9 | *.mobileprovision
10 | *.orig.*
11 | web-build/
12 |
13 | # macOS
14 | .DS_Store
15 |
16 | # env
17 | .env
18 |
19 | # @generated expo-cli sync-2b81b286409207a5da26e14c78851eb30d8ccbdb
20 | # The following patterns were generated by expo-cli
21 |
22 | expo-env.d.ts
23 | # @end expo-cli
--------------------------------------------------------------------------------
/mobile/app.json:
--------------------------------------------------------------------------------
1 | {
2 | "expo": {
3 | "name": "web3-react-native-siwe",
4 | "slug": "web3-react-native-siwe",
5 | "version": "1.0.0",
6 | "orientation": "portrait",
7 | "icon": "./assets/images/icon.png",
8 | "scheme": "myapp",
9 | "userInterfaceStyle": "automatic",
10 | "splash": {
11 | "image": "./assets/images/splash.png",
12 | "resizeMode": "contain",
13 | "backgroundColor": "#ffffff"
14 | },
15 | "ios": {
16 | "supportsTablet": true,
17 | "infoPlist": {
18 | "LSApplicationQueriesSchemes": [
19 | "metamask",
20 | "trust",
21 | "safe",
22 | "rainbow",
23 | "uniswap"
24 | ]
25 | }
26 | },
27 | "android": {
28 | "adaptiveIcon": {
29 | "foregroundImage": "./assets/images/adaptive-icon.png",
30 | "backgroundColor": "#ffffff"
31 | }
32 | },
33 | "web": {
34 | "bundler": "metro",
35 | "output": "static",
36 | "favicon": "./assets/images/favicon.png"
37 | },
38 | "plugins": [
39 | "expo-router",
40 | "expo-secure-store"
41 | ],
42 | "experiments": {
43 | "typedRoutes": true
44 | }
45 | }
46 | }
47 |
--------------------------------------------------------------------------------
/mobile/app/(app)/(auth)/_layout.tsx:
--------------------------------------------------------------------------------
1 | import React from "react";
2 | import { useSession } from "@/utils/SessionContext";
3 | import { Redirect, Slot } from "expo-router";
4 | import { Text } from "react-native";
5 |
6 | export default function AuthLayout() {
7 | const { session, isLoading } = useSession();
8 |
9 | if (isLoading) {
10 | return