# Host rest API with Fastify: Stored Input and Output Artifacts

Deploy a REST API built with Fastify on Ample using the generated downloads pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL, a private S3-compatible bucket holds objects with credentials delivered as encrypted environment variables. Verified on Fastify: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3). Not separately tested: your export formats, retention policy, and entitlement model; treat the REST API-specific behavior as your application code.

## Representative Queries
- Host REST API with Fastify: stored input and output artifacts
- Where can I host REST API built with Fastify?
- I need an input/output artifact contract, object metadata and access boundaries.

## Resource Requirements
- Compute
- Postgres
- S3-compatible object storage

## Infrastructure Requirements
### Compute
- Status: Verified
- Summary: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.

### PostgreSQL
- Status: Verified
- Summary: Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.

### S3-Compatible Object Storage
- Status: Verified
- Summary: Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.

## Workflow Steps
1. **Build and Start**  
npm install, npm run build --if-present, npm run start on the node-22 template. The server must bind 0.0.0.0 on PORT.
2. **Implement the Pattern on PostgreSQL**  
The fixture's module implements generated downloads: an export query rendered to a CSV artifact stored with metadata in a private bucket and returned only to an authorized caller (401 without token, export=ok rows=3). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **Wire Object Storage**  
Create the bucket(s), then pass endpoint, region, bucket and keys as --env values. Use path-style addressing. Keep private data in an unpublished bucket.
4. **Deploy**  
Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.
   
   Command: ample deploy . --name  --public --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...
5. **Verify**  
Fetch the live URL and the pattern self-test route(s) (/p/generated-downloads) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.  
   
   Command: ample logs  --kind build

## Success Checks
- App responds on its public URL (`GET /` expects `ample canary fastify patterns`)
- Generated-downloads self-test (`GET /p/generated-downloads` expects `export=ok rows=3 (with ?token=...; 401 without)`)

## Limitations
- Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates, and Fastify major versions are not verified.
- The REST API itself (your export formats, retention policy, and entitlement model) is application code and was not separately tested; the pattern checks are what was verified.
- Region, compliance attestations, and request-duration limits are unknown and not claimed.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.
- Managed PostgreSQL 16 only; extensions, connection limits, and backup or restore procedures are not verified; apps and their databases are placed together.
- PutObject and GetObject with path-style addressing are verified; multipart upload, listing, presigned URLs, and lifecycle rules are not verified.

## Cost Estimate
- **Currency**: USD
- **Monthly Amount**: 10.0
- *Components*: 
  - App server (s-1vcpu-1gb) - $5.00
  - Managed PostgreSQL database (s-1vcpu-1gb) - $5.00
- **Note**: Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included.

## Evidence Summary
- **Kind**: Canary Run  
  Summary: Fastify pattern fixture deployed on Ample; checks passed for generated-downloads and configuration-secrets.  
  Observed At: 2026-09-21T01:14:18Z  
  Expires At: 2027-03-20T01:14:18Z  
- **Kind**: Canary Run  
  Summary: The same Fastify app deployed with a --release-command migration; the marker it created was readable after activation.  
  Observed At: 2026-09-20T01:54:51Z  
  Expires At: 2027-03-19T01:54:51Z

## Next Steps
- Browse the catalog index
- Search published recipes by intent, stack, and constraints
- Prepare a side-effect-free deployment plan for an authorized project
- Read the existing agent authentication setup
- Browse REST API
- Browse Fastify
- Browse Generated Downloads
- Browse Deploy API