# Neon CLI command: functions

The `functions` command manages [Neon Functions](/guides/neon-functions-index) on a branch. This is the command reference; for the full deployment workflow, see [Deploy functions](/guides/neon-functions-deploy). To run functions locally, see [`neon dev`](/guides/apis-sdks-cli-dev).

Subcommands: [delete](#neon-functions-delete), [deploy](#neon-functions-deploy), [domains](#neon-functions-domains), [get](#neon-functions-get), [list](#neon-functions-list)

## neon functions deploy

Deploys a function from a local directory or entry file. The `<slug>` is the permanent function identifier: 1 to 20 lowercase letters and digits (`^[a-z0-9]{1,20}$`).

```bash
neon functions deploy <slug> [options]
```

| Option         | Description                                                                                                                              | Type    | Default | Required |
| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------- | ------- | ------- | -------- |
| `--bundle`     | Bundle --src with esbuild. Use --no-bundle to zip a prebuilt directory (root must contain index.mjs or index.js) or a file of that name. | boolean | `true`  | No       |
| `--env`        | Environment variable as KEY=VALUE (repeatable)                                                                                           | string  | —       | No       |
| `--runtime`    | Function runtime Possible values: `nodejs24`                                                                                             | string  | —       | No       |
| `--src`        | Function source: a directory containing index.ts, index.js, or index.mjs (first file match is the entry), or a path to the entry file    | string  | —       | No       |
| `--wait`       | Wait for the deployment to finish building                                                                                               | boolean | `true`  | No       |
| `--branch`     | Branch ID or name                                                                                                                        | string  | —       | No       |
| `--project-id` | Project ID                                                                                                                               | string  | —       | No       |

By default, `deploy` waits until the deployment finishes building (`--wait=true`), which is the predictable path for scripts and CI. Use `--no-wait` to return immediately after triggering the deployment.

By default, `deploy` bundles your `--src` with esbuild before uploading. Pass `--no-bundle` to skip bundling and deploy a prebuilt source instead: the directory root (or the file you point at) must be named or contain `index.mjs` or `index.js`. This is useful when you run your own build step and want to ship the output as-is.

Deploy a function from an entry file:

```bash
neon functions deploy hello --src functions/hello.ts
```

```title="Output"
INFO: Function deployment triggered for function hello.
┌────┬───────────┬──────────┬────────────┬─────────────────────────────┐
│ Id │ Status    │ Runtime  │ Memory Mib │ Created At                  │
├────┼───────────┼──────────┼────────────┼─────────────────────────────┤
│ 1  │ completed │ nodejs24 │ 2048       │ 2026-06-12T00:14:58.044690Z │
└────┴───────────┴──────────┴────────────┴─────────────────────────────┘
INFO: Function deployment hello/1 completed.
```

Deploy with environment variables and wait for the build:

```bash
neon functions deploy hello --src functions/hello.ts --env LOG_LEVEL=info --wait
```

## neon functions list

Lists the functions on the branch.

```bash
neon functions list [options]
```

| Option         | Description       | Type   | Default | Required |
| -------------- | ----------------- | ------ | ------- | -------- |
| `--branch`     | Branch ID or name | string | —       | No       |
| `--project-id` | Project ID        | string | —       | No       |

```bash
neon functions list
```

```title="Output"
┌───────┬───────┬─────────────────────────────────────────────────────────────────────────────┬─────────────────────────────┐
│ Slug  │ Name  │ Invocation Url                                                              │ Created At                  │
├───────┼───────┼─────────────────────────────────────────────────────────────────────────────┼─────────────────────────────┤
│ hello │ hello │ https://br-cool-darkness-123456-hello.compute.c-1.us-east-2.aws.neon.tech/ │ 2026-06-12T00:14:57.942988Z │
└───────┴───────┴─────────────────────────────────────────────────────────────────────────────┴─────────────────────────────┘
```

List with full deployment details for scripts and agents:

```bash
neon functions list --output json
```

:::accordion{title="Show output"}
```json
[
  {
    "id": "hello",
    "slug": "hello",
    "name": "hello",
    "invocation_url": "https://br-cool-darkness-123456-hello.compute.c-1.us-east-2.aws.neon.tech/",
    "current_deployment": {
      "id": 1,
      "status": "completed",
      "memory_mib": 2048,
      "runtime": "nodejs24",
      "created_at": "2026-06-12T00:14:58.044690Z"
    },
    "active_deployment": {
      "id": 1,
      "status": "completed",
      "memory_mib": 2048,
      "runtime": "nodejs24",
      "created_at": "2026-06-12T00:14:58.044690Z"
    },
    "created_at": "2026-06-12T00:14:57.942988Z"
  }
]
```
:::

## neon functions get

Shows a function's details.

```bash
neon functions get <slug> [options]
```

| Option                       | Description                                                  | Type    | Default | Required |
| ---------------------------- | ------------------------------------------------------------ | ------- | ------- | -------- |
| `--list-env-variables`, `-E` | List the environment variable names of the active deployment | boolean | `false` | No       |
| `--branch`                   | Branch ID or name                                            | string  | —       | No       |
| `--project-id`               | Project ID                                                   | string  | —       | No       |

```bash
neon functions get hello
```

```title="Output"
function
┌───────┬───────┬─────────────────────────────────────────────────────────────────────────────┬─────────────────────────────┐
│ Slug  │ Name  │ Invocation Url                                                              │ Created At                  │
├───────┼───────┼─────────────────────────────────────────────────────────────────────────────┼─────────────────────────────┤
│ hello │ hello │ https://br-cool-darkness-123456-hello.compute.c-1.us-east-2.aws.neon.tech/ │ 2026-06-12T00:14:57.942988Z │
└───────┴───────┴─────────────────────────────────────────────────────────────────────────────┴─────────────────────────────┘
deployment (current, active)
┌────┬───────────┬──────────┬────────────┬─────────────────────────────┐
│ Id │ Status    │ Runtime  │ Memory Mib │ Created At                  │
├────┼───────────┼──────────┼────────────┼─────────────────────────────┤
│ 1  │ completed │ nodejs24 │ 2048       │ 2026-06-12T00:14:58.044690Z │
└────┴───────────┴──────────┴────────────┴─────────────────────────────┘
```

## neon functions delete

Deletes a function on the branch.

```bash
neon functions delete <slug> [options]
```

| Option         | Description       | Type   | Default | Required |
| -------------- | ----------------- | ------ | ------- | -------- |
| `--branch`     | Branch ID or name | string | —       | No       |
| `--project-id` | Project ID        | string | —       | No       |

```bash
neon functions delete hello
```

```title="Output"
INFO: Function hello deleted from branch br-cool-darkness-123456
```

## neon functions domains

Manage custom domains for functions on the branch.

Subcommands: [delete](#neon-functions-domains-delete), [list](#neon-functions-domains-list), [register](#neon-functions-domains-register)

### neon functions domains list

Lists the custom domains registered on the branch.

```bash
neon functions domains list [options]
```

| Option         | Description       | Type   | Default | Required |
| -------------- | ----------------- | ------ | ------- | -------- |
| `--branch`     | Branch ID or name | string | —       | No       |
| `--project-id` | Project ID        | string | —       | No       |

```bash
neon functions domains list
```

The default table shows the domain, target function, and CNAME target. To inspect DNS and routing status, use JSON output:

```bash
neon functions domains list --output json
```

```json title="Output"
[
  {
    "domain": "docs.example.com",
    "entity_type": "function",
    "entity_id": "hello",
    "cname_target": "fn-custom-domains.us-east-2.aws.neon.tech",
    "status": "active",
    "dns_status": "ok",
    "binding_status": "present",
    "status_reason": ""
  }
]
```

An `active` status confirms that DNS, CAA authorization, and routing are ready. Verify the domain with an HTTPS request because certificate issuance isn't included in this status.

### neon functions domains register

Points a domain you already own at a function on the branch. Both `--slug` and the domain are required. The command prints a CNAME target; create a CNAME record for the domain at your DNS provider pointing at that target. See [Custom domains](/guides/neon-functions-custom-domains) for DNS, CAA, and TLS details.

```bash
neon functions domains register <domain> [options]
```

| Option         | Description                               | Type   | Default | Required |
| -------------- | ----------------------------------------- | ------ | ------- | -------- |
| `--slug`       | Function slug this domain should point at | string | —       | Yes      |
| `--branch`     | Branch ID or name                         | string | —       | No       |
| `--project-id` | Project ID                                | string | —       | No       |

```bash
neon functions domains register docs.example.com --slug hello
```

### neon functions domains delete

Deletes a custom domain from the branch.

```bash
neon functions domains delete <domain> [options]
```

| Option         | Description       | Type   | Default | Required |
| -------------- | ----------------- | ------ | ------- | -------- |
| `--branch`     | Branch ID or name | string | —       | No       |
| `--project-id` | Project ID        | string | —       | No       |

```bash
neon functions domains delete docs.example.com
```

Routing changes are eventually consistent, so the custom URL can continue reaching the function briefly after deletion. Deleting a function doesn't delete its custom-domain registration; delete the domain separately.

## Related pages

- [Neon CLI command: triggers](./apis-sdks-cli-triggers.md)
- [Neon CLI command: buckets](./apis-sdks-cli-buckets.md)
- [Neon CLI command: data-api](./apis-sdks-cli-data-api.md)
- [Neon CLI command: neon-auth](./apis-sdks-cli-neon-auth.md)
- [Neon CLI command: credentials](./apis-sdks-cli-credentials.md)

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