Expo Examples skill

Expo Examples

expo/examples is Expo's official library of ~70 integration examples — directories named with-<library> (e.g. with-stripe, with-maps), each built around one library or service. These are not full apps: they're managed projects (no ios//android/ dirs — native setup is via config plugins), and the typical one is a single screen of ~100–200 lines. Mine them for the canonical integration pattern — the dependency set, app.json config plugins, and minimal wiring Expo maintains against the current SDK — and adapt that into the user's app. Don't expect to lift an application architecture from them.

Reach for an example before hand-rolling an integration. (Kinds — full-stack, showcases, starters — are noted in ./references/catalog.md.)

Two modes

1. Inspiration / adapt (most common) — the user already has a project. Find the matching example, read its key files, and apply the pattern to their code.
2. Scaffold — greenfield. Start a fresh project directly from the example.

Workflow

1. Find the right example

Map the user's need to an example name (e.g. payments → with-stripe, auth → with-clerk). ./references/catalog.md is a categorized snapshot for fast triage — but it drifts, so confirm against the live list:

# Live example names:
gh api repos/expo/examples/contents --jq '.[] | select(.type=="dir" and (.name|startswith(".")|not)) | .name'
# Aliases (renamed) + deprecated (dead/moved) examples — check before recommending:
gh api repos/expo/examples/contents/meta.json --jq '.content' | base64 -d

meta.json is the source of truth for what's renamed or dead (deprecated examples are removed from the repo tree but still listed here, each with a message). If an example is in its deprecated map, don't recommend it — follow the message to the modern path. If it's in aliases, use the destination.

2a. Inspiration mode — study without touching the user's project

The common case: the user already has an app and wants to see how Expo does something. Read the example as reference and apply the patterns by hand — never scaffold an example on top of their project.

First, list the whole example in one call. Integration code is often nested (e.g. Stripe's server routes live in app/api/), so a one-level listing misses the important files:

gh api 'repos/expo/examples/git/trees/master?recursive=1' \
  --jq '.tree[].path | select(startswith("with-stripe/"))'

Then read the high-signal files first: README.md (setup) → package.json (deps) → app.json (config plugins / permissions) → the integration code the manifest revealed → .env (required secrets). Per file:

gh api repos/expo/examples/contents/with-stripe/utils/stripe-server.ts --jq '.content' | base64 -d
# No gh? Raw URL (branch is master):
curl -s https://raw.githubusercontent.com/expo/examples/master/with-stripe/utils/stripe-server.ts

Reading more than a couple of files? Many integrations are spread across server routes, a client provider, and config (Stripe is). Skip the per-file calls — pull the whole example into a throwaway/gitignored dir (not the user's project) and read it freely with Grep/Read, then apply by hand:

npx degit expo/examples/with-stripe /tmp/expo-ref/with-stripe   # clean copy, no git history
# fallback without degit (sparse-checkout, no full ~64 MB clone):
git clone --depth 1 --filter=blob:none --sparse https://github.com/expo/examples.git /tmp/expo-ref/examples \
  && (cd /tmp/expo-ref/examples && git sparse-checkout set with-stripe)

Read from there with Grep/Read; delete the scratch dir when done.

2b. Scaffold mode — new project from an example

npx create-expo --example with-stripe   # short form:  npx create-expo -e with-stripe
bun create expo --example with-stripe    # with bun

3. Adapt into the user's app — non-destructively (critical)

When the user already has an app, add only what the example introduces; never overwrite their setup.

• Version-align — don't copy pinned versions. Examples track the latest SDK, so their package.json pins won't match an older project. Add only the missing deps with npx expo install <pkg> (it resolves SDK-correct versions) instead of copying exact versions.
• Merge config, don't replace it. Add only the app.json/app.config.* plugins and permissions the example introduces that the user lacks — keep their existing config block intact.
• Port the integration code.
• Recreate env vars from the example's .env shape — it holds placeholders, never working secrets.

Done when the integration code is ported and every dependency, config plugin, permission, and env var it needs is accounted for in the user's app — not when it merely looks wired up.

Gotchas

• Default branch is master, not main (matters for raw URLs and sparse checkout).
• Single-click deploy. Every example has a launch URL: https://launch.expo.dev/?github=https://github.com/expo/examples/tree/master/<example>.

Related skills

• Native UI components (@expo/ui package) → expo-ui
• Styling and native-feeling screens → expo-native-ui
• Navigation and routing → expo-router
• Authoring a native module → expo-module
• Upgrade the SDK before adopting a latest-SDK example → expo-upgrade

References

• ./references/catalog.md — categorized snapshot of the example library for fast triage.

Submitting Feedback

If you encounter errors, misleading or outdated information in this skill, report it so Expo can improve:

npx --yes @expo/agent-cli@latest feedback --category skills --subject "expo-examples" "<actionable feedback>"

Only submit when you have something specific and actionable to report. Include as much relevant context as possible. If an agent repeatedly fails at an Expo task or the user has to step in, submit a brief report of the task, expected result, and what went wrong using --category evals and the relevant Expo package or command as --subject.