page:recipes:rest api:nestjs:persistent state

Host rest api with NestJS: Postgres-backed state

Deploy a rest api built with NestJS on Ample using the durable job state 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. Verified on NestJS: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Not separately tested: your job types, payload schema and retry policy; treat the rest api-specific behavior as your application code.

Representative Queries

• Host rest api with NestJS: Postgres-backed state
• Where can I host REST API built with NestJS?
• I need a durable state schema and retry/recovery semantics implemented by application code.

Resource Requirements

• Compute
• Postgres

Infrastructure Requirements

1. 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.
2. Postgres
   • 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.

Prerequisites

• A NestJS project that builds and starts with the documented commands (npm install, nest build (TypeScript) then node dist/main.js on the node-22 template)
• A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env)
• An Ample account token with servers:write, databases:read

Tested Configuration

• Template: node-22
• Runtime: node
• Size: s-1vcpu-1gb
• Install: npm install
• Build: npm run build --if-present
• Start: npm run start

Workflow Steps

1. Build and start
   npm install, nest build (TypeScript) then node dist/main.js 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 durable job state: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. 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.
   ample deploy . --name --public
4. Verify
   Fetch the live URL and the pattern self-test route(s) (/p/durable-job-state) from the example; then run your own checks. On failure read ample logs --kind build then --kind runtime.
   ample logs --kind build

Examples

• NestJS pattern fixture
  Multi-pattern NestJS app whose durable job state module was checked live; the module is under tests/deploy-canaries/_pattern-modules.
  Source Reference: tests/deploy-canaries/nestjs-patterns

Success Checks

• App responds on its public URL
  • Kind: http_get
  • Path: /
  • Expect: ample canary nestjs patterns
• Durable-job-state self-test
  • Kind: http_get
  • Path: /p/durable-job-state
  • Expect: job=done attempts=1 idempotent=true

Limitations

• Verified on the node-22 template at s-1vcpu-1gb with the example fixture; other sizes, templates and NestJS major versions are not verified.
• The rest api itself (your job types, payload schema and retry policy) 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.

Cost Estimate

• Currency: USD
• Monthly Amount: 10.0
• 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.
• Components:
  1. App Server
     • Size: s-1vcpu-1gb
     • Quantity: 1.0
     • Monthly Amount: 5.0
  2. Managed PostgreSQL Database
     • Size: s-1vcpu-1gb
     • Quantity: 1.0
     • Monthly Amount: 5.0

Evidence Summary

• NestJS pattern fixture deployed on Ample
  • Implementation Revision: 1d28ae0-dirty (CLI 0.1.21)
  • Checks: /p/durable-job-state
  • Observed At: 2026-09-21T02:34:39Z
  • Expires At: 2027-03-20T02:34:39Z