# Postgres.js

Postgres.js Quickstart

## Connecting with Postgres.js

[Postgres.js](https://github.com/porsager/postgres) is a full-featured Postgres client for Node.js and Deno.

1. **Install**

Install Postgres.js and related dependencies.

```shell
npm i postgres
```

2. **Connect**

Create a `db.js` file with the connection details.

To get your connection details, go to the [**Connect** panel](/dashboard/project/_?showConnect=true). Choose [**Transaction pooler**](/dashboard/project/_?showConnect=true\&method=transaction) if you're on a platform with transient connections, such as a serverless function, and [**Session pooler**](/dashboard/project/_?showConnect=true\&method=session) if you have a long-lived connection. Copy the URI and save it as the environment variable `DATABASE_URL`.

Caution: `postgres.js` pipelines queries by default. Combined with the [shared pooler transaction mode](/docs/guides/database/connecting-to-postgres#pooler-transaction-mode), this can hang queries or return mismatched rows. `postgres.js` has no working option to turn pipelining off directly: `max_pipeline: 0` breaks `sql.begin()` transactions instead, a known upstream [bug](https://github.com/porsager/postgres/issues/1189).

For more about pipelining with `postgres.js`, [contact support](/dashboard/support/new).

```ts
// db.js
import postgres from 'postgres'

const connectionString = process.env.DATABASE_URL
const sql = postgres(connectionString, { prepare: false })

export default sql
```

3. **Execute commands**

Use the connection to execute commands.

```ts
import sql from './db.js'

async function getUsersOver(age) {
  const users = await sql`
    select name, age
    from users
    where age > ${ age }
  `
  // users = Result [{ name: "Walter", age: 80 }, { name: 'Murray', age: 68 }, ...]
  return users
}
```