expo-api-routes

Overview of expo-api-routes skill

What expo-api-routes is for

The expo-api-routes skill helps you create API route files for Expo Router apps deployed with EAS Hosting. Its real job is not just generating a sample endpoint, but helping you decide when server-side routes are the right backend layer inside an Expo project and how to structure them correctly in app/**/+api.ts files.

Who should install this skill

This expo-api-routes skill is best for developers who are:

• building an Expo app and need lightweight server logic
• adding secure calls that must keep secrets off the client
• implementing webhook handlers, validation, or server-side data access
• using Expo Router and want file-based API route conventions without guessing

It is less useful if you already know the Expo API route file pattern well or if your app needs a larger backend architecture than route handlers can comfortably support.

What users actually care about first

Most people looking at expo-api-routes want fast answers to four install-decision questions:

1. Should this logic live in an Expo API route at all?
2. Where do the files go and how are routes named?
3. What are the clear misfit cases?
4. Can this help me produce working route files faster than a generic prompt?

This skill is strongest on those decision points, especially the “use vs do not use” boundary.

Key differentiators from a generic coding prompt

The main advantage of expo-api-routes for API Development is specificity. Instead of a vague “write me an API endpoint” prompt, this skill centers the Expo Router route format, EAS Hosting context, and common server-side use cases such as:

• secret handling
• database operations
• third-party API proxying
• webhook endpoints
• rate limiting
• heavier server-side processing

That makes it better for scaffolding the right shape quickly, especially when your first blocker is route placement and fit, not framework theory.

Important limits before you install

The skill appears intentionally narrow. It gives guidance and examples, but not a full backend playbook. If you need deep patterns for auth, streaming, file uploads, background jobs, real-time systems, or a production-ready architecture review, expo-api-routes should be treated as a starting aid rather than a complete backend system designer.

How to Use expo-api-routes skill

Install expo-api-routes in your skills environment

Use the standard install flow for GitHub-hosted skills:

npx skills add https://github.com/expo/skills --skill expo-api-routes

After install, invoke it when you want route-specific help rather than general Expo advice.

Read SKILL.md before asking for code

The repository signal is concentrated in SKILL.md. Read that first because it contains the actual decision rules:

• when API routes are appropriate
• when not to use them
• expected file structure
• a basic route example

For this skill, repo skimming beyond SKILL.md adds little compared with understanding those boundaries well.

Know the file convention the skill expects

The expo-api-routes usage pattern depends on Expo Router file naming. API routes live under app/ and use the +api.ts suffix, for example:

• app/api/hello+api.ts → GET /api/hello
• app/api/users+api.ts → /api/users
• app/api/users/[id]+api.ts → /api/users/:id

If your request does not specify a route path or file target, the output quality drops because the skill has to guess your route layout.

Start with a job, not a framework request

Weak input:

• “Create an Expo API route.”

Stronger input:

• “Create app/api/stripe/webhook+api.ts for an Expo Router app on EAS Hosting. Verify the webhook signature, reject non-POST methods, parse the event, and return clear status codes. Keep secrets server-side.”

The stronger version gives the skill what it needs:

• exact file path
• HTTP method
• hosting/runtime context
• security constraints
• expected behavior
• success and failure response shape

Give the inputs that change the output most

For a good expo-api-routes guide workflow, provide these details up front:

• route path and filename
• allowed HTTP methods
• request body shape or query params
• external services involved
• secrets that must stay server-side
• validation rules
• response schema
• error cases and status codes
• whether the route is public, authenticated, or webhook-only

These inputs matter more than asking for “best practices” in the abstract.

Turn rough goals into complete prompts

A practical prompt template:

• “Use the expo-api-routes skill.”
• “Target file: app/api/...+api.ts.”
• “Purpose: proxy, validation, DB write, webhook, or compute task.”
• “Methods: GET/POST/etc.”
• “Input: expected params/body.”
• “Output: JSON response examples.”
• “Constraints: secrets, auth, rate limits, runtime concerns.”
• “Include: method guard, validation, error handling, comments if needed.”

Example:

• “Use expo-api-routes to create app/api/users/[id]+api.ts. Support GET for fetching a user by ID and PATCH for updating profile fields. Validate id, reject unsupported methods, keep database access server-side, and return typed JSON examples.”

Use the skill for the right problem types

Best-fit tasks for expo-api-routes install and use include:

• protecting API keys from the client
• server-side database access
• creating a proxy to third-party APIs
• validating requests before writes
• receiving webhook callbacks
• applying server-side throttling or gating
• moving expensive logic off-device

These are all cases where an on-platform route file is simpler than standing up a separate backend too early.

Avoid the misfit cases early

Do not force expo-api-routes into cases the skill itself flags as poor fit:

• public data fetches that can happen directly from the client
• simple static or client-safe operations
• real-time features needing persistent connections
• plain CRUD where managed backends may be faster to ship
• file uploads better handled via direct-to-storage patterns
• auth-only flows better served by dedicated auth providers

This is one of the highest-value parts of the skill because it prevents overbuilding.

Suggested first workflow for real projects

A practical expo-api-routes usage sequence:

1. Decide whether the route really needs server execution.
2. Pick the exact URL path and file path.
3. Define request and response contracts.
4. Ask the skill for the route scaffold.
5. Add your actual secrets, SDK calls, or DB logic.
6. Test method guards, invalid payloads, and failure responses.
7. Revisit whether this route should stay in Expo or move to a dedicated backend later.

This workflow keeps the skill focused on the part it accelerates best: correct route setup and first-pass server logic.

What to ask for if you want better first outputs

Ask for concrete production behaviors, not just code generation. Good additions include:

• “reject unsupported methods with 405”
• “return 400 for invalid input”
• “do not expose secret values in responses”
• “normalize response shape across success and failure”
• “show where env vars are used”
• “separate parsing, validation, and handler logic clearly”

These prompts produce outputs that are easier to review and safer to adopt.

What to inspect in generated output

Before accepting output from the expo-api-routes skill, check:

• route file is placed under app/
• filename ends with +api.ts
• exported handlers match intended methods
• secrets remain server-side
• validation is explicit, not implied
• status codes are intentional
• unsupported methods are handled
• client-only code was not accidentally mixed into the route

These checks catch most first-pass mistakes quickly.

expo-api-routes skill FAQ

Is expo-api-routes good for beginners?

Yes, especially if you are new to Expo Router server routes and need help with conventions. The skill is narrow enough to be understandable, but beginners still need to know basic HTTP concepts and how environment secrets should be handled.

How is expo-api-routes different from a normal prompt?

A normal prompt may generate generic Node or Express code that does not match Expo Router file conventions. The expo-api-routes skill is more useful when you need output aligned to Expo route naming and the common “should this be server-side?” decision.

When should I not use expo-api-routes?

Skip it if your problem is mainly:

• client-side data fetching from public APIs
• real-time messaging
• large-scale backend architecture
• auth provider setup
• direct file upload architecture
• a managed backend comparison exercise

In those cases, the skill is too narrow to be your main guide.

Does expo-api-routes replace a full backend?

No. It helps with route-level implementation inside an Expo app, not full backend platform design. It is best viewed as a lightweight server capability for specific endpoints.

Is expo-api-routes useful for webhook endpoints?

Yes. Webhooks are one of the clearest fits because they require a server-reachable endpoint and often involve secret verification and controlled server-side processing.

Is expo-api-routes suitable for simple CRUD apps?

Sometimes, but this is also where caution matters. If your CRUD needs are basic and a managed backend would remove custom server work, using Expo API routes may add maintenance you do not need.

How to Improve expo-api-routes skill

Give expo-api-routes exact route targets

The biggest quality upgrade is specificity. Name the intended file, path, methods, and data contract. “Build an API route” is weak; “create app/api/orders/[id]+api.ts with GET and DELETE” is much stronger.

Describe the security boundary clearly

Many expo-api-routes for API Development tasks exist because secrets must stay server-side. Say exactly which credentials, tokens, or provider keys must never reach the client. That pushes the output toward a safer design.

Include request and response examples

If you provide sample payloads, the skill can produce better validation and clearer handler logic.

Better input:

• request JSON example
• response success example
• response error example

This helps more than asking for “robust” code without examples.

State what must happen on invalid input

A common failure mode is incomplete error handling. Improve results by specifying:

• missing field behavior
• invalid type behavior
• unauthorized access behavior
• unsupported method behavior
• third-party API failure behavior

That produces route code you can review against real edge cases.

Ask the skill to justify route fit

One of the best ways to improve expo-api-routes guide output is to ask:

• “Why should this be an Expo API route instead of client-side fetch?”
• “What makes this a bad fit for Expo API routes?”

That turns the skill into a decision aid, not just a code writer.

Iterate after the first draft with concrete corrections

After the first output, refine with focused follow-ups such as:

• “Add method guards.”
• “Tighten validation for nested fields.”
• “Return consistent JSON errors.”
• “Move all secret usage server-side.”
• “Refactor for a dynamic route segment.”
• “Show the exact file tree placement.”

Short corrective iterations work better than restarting from scratch.

Watch for common output mistakes

Typical issues to catch and fix:

• generic server code not shaped for +api.ts
• missing dynamic route filename conventions
• unclear separation between client and server concerns
• no rejection of unsupported methods
• hand-wavy validation
• examples that omit actual request/response contracts

Spotting these early is how to get reliable value from the expo-api-routes skill.

Use expo-api-routes as a scoped accelerator

The highest-value way to use expo-api-routes is as a focused assistant for endpoint scaffolding and route-fit decisions. Use it to accelerate the first 80% of a route, then apply your app-specific auth, storage, monitoring, and testing standards before shipping.