# Elysia (/docs/guides/frameworks/elysia)

Build an Elysia API on Prisma ORM with the elysia template and deploy it to Prisma Compute.

Location: Guides > Frameworks > Elysia

## Introduction

In this guide, you scaffold an Elysia API backed by Prisma ORM, initialize and seed a PostgreSQL database, serve data over HTTP, and deploy the API to [Prisma Compute](/guides/deploy-compute) as a Bun app. The `elysia` template generates the server, so most of the work is understanding the pieces.

Every command and response below was run end to end against a live Prisma Postgres database.

## Prerequisites

- [Bun](https://bun.sh/) 1.1 or later (Elysia is Bun-first)
- A PostgreSQL connection string, or nothing at all: the scaffold can create a [Prisma Postgres](/guides/introduction-2-postgres) database for you

## Use with your agent

To delegate this guide to your coding agent, copy the prompt below and hand it over:

```text
Verify `bun --version` first; if Bun is missing, stop and ask. Create a new Elysia API with Prisma ORM, seed it, and deploy it to Prisma Compute.

1. Scaffold: `bun create prisma@latest my-elysia-api --template elysia --provider postgres --yes`. Then run `bunx prisma@latest init` in `my-elysia-api` so the Prisma agent skills are installed and stay current, and use them. Get a database connection string: use the one I give you, or create a Prisma Postgres database with `npx create-db@latest` and show me the claim URL it prints. Export it as `DATABASE_URL` in the shell; the generated scripts read the environment variable, not `.env`.
2. In `my-elysia-api`, run `bun run db:init` with `DATABASE_URL` exported. Sample users are seeded automatically on the app's first query; there is no separate seed script.
3. Start `bun run dev` in the background, wait until it reports ready, verify `curl http://localhost:3000/users` returns the seeded users, then stop the dev server.
4. Deploy: check `bunx prisma@latest auth whoami`; if I am not signed in, stop and ask me to run `bunx prisma@latest auth login`. Then run `bun run build` followed by `bunx prisma@latest deploy module.ts` and verify the live URL's /users endpoint. The deployed app provisions and seeds its own Prisma Postgres database; do not pass the local DATABASE_URL. If the deploy fails with `HostedStateBootstrapError`, a project with the module's name exists in my workspace but its hosted state cannot be verified; re-run the deploy with `--name <a unique name>`.

Use the installed Prisma ORM skills.
```

## 1. Scaffold the project

```bash
bun create prisma@latest my-elysia-api --template elysia --provider postgres --no-deploy
```

Answer the prompts for contract authoring style, package manager, and agent skills. The template generates an Elysia server in `src/index.ts` with `GET /` and `GET /users` routes, the Prisma ORM setup in `src/prisma/`, and package scripts for the database steps.

Next, set the database connection for the local steps. Use your own PostgreSQL connection string, or create a Prisma Postgres database with `npx create-db@latest`; it prints a connection string and a claim URL you can open to keep the database. Export the variable in the shell you work in; the generated scripts read the environment variable, not `.env`:

```bash
export DATABASE_URL="<your connection string>"
```

```bash
cd my-elysia-api
```

## 2. Initialize the database

```bash
bun run db:init
```

```text no-copy
"summary": "Applied 5 operation(s) across 1 space(s), database signed"
```

If `db:init` stops with `Connection terminated unexpectedly`, a database you just created is still starting; wait a few seconds and run it again. The command is safe to repeat and reports `Applied 0 operation(s)` when there is nothing left to do.

## 3. Run the server

```bash
bun run dev
```

The server starts on port 3000 (set `PORT` to change it):

```bash
curl http://localhost:3000/users
```

```json no-copy
[
  { "id": "1", "email": "alice@prisma.io", "username": "alice", "name": "Alice", "createdAt": "2026-07-24T11:43:41.450Z" },
  { "id": "2", "email": "bob@prisma.io", "username": "bob", "name": "Bob", "createdAt": "2026-07-24T11:43:41.490Z" },
  { "id": "3", "email": "carol@prisma.io", "username": "carol", "name": "Carol", "createdAt": "2026-07-24T11:43:41.533Z" }
]
```

The route handler is ordinary Elysia code calling an ordinary Prisma ORM query; there is no framework adapter in between. To add write routes, follow the same pattern as the [Hono guide's POST route](/guides/guides-3-frameworks-hono#4-add-a-post-route); the query code is identical.

## 4. Deploy to Prisma Compute

Elysia is supported on [Prisma Compute](/guides/deploy-compute). The scaffold declares the app for [Prisma Composer](/guides/build-composer) in `module.ts` and `service.ts`, pointing at the bundled server the `build` script produces, so no framework flags are needed. Sign in once (it opens a browser):

```bash
bunx prisma@latest auth login
```

Then build and deploy from the project directory:

```bash
bun run build
bunx prisma@latest deploy module.ts
```

```text no-copy
my-elysia-api
├─ database   postgres-database db_abc123
└─ app        compute-service cps_abc123
              https://xyz.ewr.prisma.build
```

The deploy creates a project named after your module in your workspace, and re-running the deploy reuses it: the CLI finds the hosted state it stored on the first run and converges the project to your module. If a project with that name exists but the CLI cannot identify or verify its stored state (one left behind by a different checkout, for example), the deploy stops with `HostedStateBootstrapError`; deploy under another name with `--name <unique-name>`, or rename the module in `module.ts`. The deploy also provisions its own Prisma Postgres database on the platform, declared in `module.ts`; the `DATABASE_URL` from your local steps is not involved, and the deployed database seeds on the app's first query. Verify the live endpoint returns the seeded users:

```bash
curl https://xyz.ewr.prisma.build/users
```

For previews per Git branch and deploy on push, see [Deploy on push](/guides/integrations-deploy-on-push).

## Common gotchas

> \[!WARNING]
> In a long-running server, don't call `db.close()` in route handlers; the client's connection pool is shared across requests. Close it only on process shutdown.

## Prompt your coding agent

Run [`bunx prisma@latest init`](/guides/platform-init) once to install the [Prisma ORM skills](/guides/tools-skills#available-skills-for-prisma-orm-8) for your coding agent and keep them matching your installed packages. Prompts that map to this guide:

- "Using the prisma-8 skill, add GET /users/:id that returns one user or a 404."
- "Add a POST /users route that creates a user from the request body."

## Next steps

- [Learn the fundamentals](/guides/fundamentals-reading-data): filtering, sorting, pagination, and writes.
- [Read the Prisma ORM overview](/guides/introduction-2-orm) for the concepts behind contracts and typed queries.
- [Use the Hono guide](/guides/guides-3-frameworks-hono) for the tested POST route pattern.

## Related pages

- [`Astro`](/guides/guides-3-frameworks-astro): Set up Prisma ORM in an Astro app with create-prisma, from scaffold to rendered data, and deploy it to Prisma Compute.
- [`Hono`](/guides/guides-3-frameworks-hono): Build a Hono API on Prisma ORM with the hono template, add your own routes, and deploy it to Prisma Compute.
- [`NestJS`](/guides/guides-3-frameworks-nestjs): Set up Prisma ORM in a NestJS app with create-prisma, from scaffold to seeded API to a live deploy on Prisma Compute.
- [`Next.js`](/guides/guides-3-frameworks-nextjs): Set up Prisma ORM in a Next.js app with create-prisma, from scaffold to rendered data, and deploy it to Prisma Compute.
- [`Nuxt`](/guides/guides-3-frameworks-nuxt): Set up Prisma ORM in a Nuxt app with create-prisma, from scaffold to rendered data, and deploy it to Prisma Compute.

## Related pages

- [Authentication & Tools](./authentication-tools-index.md)
- [Build](./build-index.md)
- [Changelog](../changelog.md)
- [Concepts](./concepts-index.md)
- [Console commands](./console-commands-index.md)
- [Contract Authoring](./contract-authoring-index.md)
- [Core Concepts](./core-concepts-index.md)
- [Data Modeling](./data-modeling-index.md)
- [Database](./database-index.md)
- [DB commands](./db-commands-index.md)

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