Add Expo Secure Store

Add Expo Secure Store

Encrypted at-rest storage backed by iOS Keychain. Use for auth tokens, API keys, anything sensitive.

Install

npx expo install expo-secure-store

Usage

import * as SecureStore from 'expo-secure-store';

// Save
await SecureStore.setItemAsync('authToken', token);

// Read
const token = await SecureStore.getItemAsync('authToken');

// Delete
await SecureStore.deleteItemAsync('authToken');

// With biometric protection (Face ID / Touch ID required to unlock)
await SecureStore.setItemAsync('vaultKey', secret, {
  requireAuthentication: true,
  authenticationPrompt: 'Authenticate to access your vault',
});

ABSOLUTE NO

• Never store tokens in AsyncStorage or MMKV (no encryption at rest)
• Never store more than 2KB per item (Keychain limits — use expo-sqlite for larger)
• Never call from main thread in tight loops (it's async, use it that way)

Add Face ID permission

{
  "expo": {
    "ios": {
      "infoPlist": {
        "NSFaceIDUsageDescription": "Access your secure vault"
      }
    }
  }
}

Reference

references/01-expo-sdk-54.md

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: khadinakbarlabs
• Source: khadinakbarlabs/expo-mobile-app-builder
• License: MIT
• Homepage: https://khadinakbar.com

Install and usage instructions live in the source repository linked above.