## The short version Move Express compute from Vercel app to Ample, one component at a time. Destination verified on Ample: the app built, started and answered on its public HTTPS URL with encrypted configuration delivered. Source procedure: Copy environment variables from the Vercel project settings (or `vercel env pull`) into an env file you keep out of the repository. Not migrated automatically: Edge middleware, ISR revalidation, image optimization, cron jobs and Vercel integrations are not migrated and are unverified on Ample. Cutover: Add the custom domain with `ample domain add`, set the documented DNS records, keep the Vercel deployment until traffic is verified, then remove the domain from Vercel. Rollback: keep the source untouched until you confirm; nothing at the source is changed or deleted by this guide. ## What it needs - [Compute](/content/discover/primitive/compute/index.html): verified (Apps run in isolated x86_64 Firecracker microVMs; sizes are the priced VM sizes.) - [Postgres](/content/discover/primitive/postgres/index.html): verified (Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.) ## Before you start - Authorized access to the Vercel app source and its export tooling - An inventory of every component in scope and out of scope - A validated backup or copy before any cutover - An Ample account token with servers:write, databases:read ## How to do it 1. **Inventory the source** List what Vercel app provides beyond the component you are moving. Out of scope here: Edge middleware, ISR revalidation, image optimization, cron jobs and Vercel integrations are not migrated and are unverified on Ample. 2. **Source step 1** Copy environment variables from the Vercel project settings (or `vercel env pull`) into an env file you keep out of the repository 3. **Source step 2** Note the framework preset, build command and output directory; Ample detects the same from the repository 4. **Source step 3** List Vercel-only features in use: edge middleware, ISR revalidation, image optimization, cron jobs, integrations 5. **Deploy on Ample in parallel** `npm install`, `npm run build --if-present`, `npm run start` on the node-22 template. Pass the exported variables with `--env`; keep the source running. ``` ample deploy . --name --public --env-file .env.production ``` 6. **Validate before cutover** Run the app's own checks and, for data, compare counts and checksums; the example checks are the pattern self-tests (`/p/configuration-secrets`, `/p/relational-records`). 7. **Cut over** Add the custom domain with `ample domain add`, set the documented DNS records, keep the Vercel deployment until traffic is verified, then remove the domain from Vercel. 8. **Rollback** Point DNS or configuration back to the source. The source was never modified; deletion is a separate, user-executed step after validation. ## Tested examples - **Express pattern fixture (destination)** (`tests/deploy-canaries/express-patterns`): Verified destination basis: Express compute. ## How to know it worked - destination app responds on its public URL (`/` on the live URL, expect ample canary express patterns) - configuration-secrets check from the destination example (`/p/configuration-secrets` on the live URL, expect see the pattern fixture checks) - relational-records check from the destination example (`/p/relational-records` on the live URL, expect see the pattern fixture checks) - data or object counts and checksums match the source ## Cost estimate Estimated 10.00 USD per month (size prices from pricing.toml at build revision ca0b484a7a9957c573a88d3a32dc603c3c10135a). - app server x1 `s-1vcpu-1gb`: 5.00 USD - managed PostgreSQL database x1 `s-1vcpu-1gb`: 5.00 USD Upper-bound monthly price of the tested sizes at the destination. Source costs are unknown to Ample. ## Verification evidence - canary_run on 2026-09-21T02:34:39Z at revision `1d28ae0 (CLI 0.1.21)`: Destination side verified: the Express pattern fixture deployed on Ample (npm install, npm run build --if-present, npm run start on the node-22 template) and its checks passed (the app built, started and answered on its public HTTPS URL with encrypted configuration delivered). The source-side export from Vercel app is documented from the vendor's standard tooling and was not executed by this catalog's evidence. (expires 2027-03-20T02:34:39Z) ## Execution binding No execution binding. This recipe is documentation only; nothing is executed automatically. ## Typed next actions - Browse the catalog index (`GET /v1/catalog` on the api origin; authentication not required, approval not required) - Search published recipes by intent, stack and constraints (`POST /v1/catalog/search` on the api origin; authentication not required, approval not required) - Prepare a side-effect-free deployment plan for an authorized project (`POST /v1/catalog/plan` on the api origin; authentication required, approval not required) - Read the existing agent authentication setup (`GET /mcp/setup` on the api origin; authentication not required, approval not required) - Browse Vercel app (`GET /v1/catalog/nodes/migration%3Avercel-app` on the api origin; authentication not required, approval not required) - Browse Express (`GET /v1/catalog/nodes/stack%3Aframework-express` on the api origin; authentication not required, approval not required) - Browse Migrate compute (`GET /v1/catalog/nodes/intent%3Amigrate-compute` on the api origin; authentication not required, approval not required) Actions describe possible next steps. They are typed data, not commands, and grant no permission. Public discovery never provisions anything; planning requires your own authenticated token and approval happens in your client. ## Identifiers and status Recipe `page:migrate:vercel-app:express`. Revision r1. release **published** support **verified** execution **unbound** Formats: [HTML](/content/migrate/vercel-app/express/index.html) | [Markdown](/content/migrate/vercel-app/express.md) | [JSON contract](https://api.ample.computer/v1/catalog/recipes/page%3Amigrate%3Avercel-app%3Aexpress)