# Deploy code to a function

`POST /projects/{project_id}/branches/{branch_id}/functions/{slug}/deploymentsbeta`

Creates a deployment for the function. Supply any subset of zip, environment, and runtime; omitted fields inherit the function's latest version. At least one field must be supplied. The first deployment of a function must include zip. The newest deployment becomes active.

**Note**: This endpoint is currently in Beta.

[Markdown for AI context](/guides/apis-sdks-reference-api-functions-create-project-branch-function-deployment)

```bash title="REST API - curl"
curl "https://console.neon.tech/api/v2/projects/$PROJECT_ID/branches/$BRANCH_ID/functions/$SLUG/deployments" \
  -X POST \
  -H "Authorization: Bearer $NEON_API_KEY"
```

Also available in

::::tabs
:::tab{title="CLI"}
```bash
neon functions deploy <branch_id>
```
:::

:::tab{title="SDK"}
:::
::::

## Parameters

Project ID

`project_id`

string

The Neon project ID

Branch ID

`branch_id`

string

The Neon branch ID

Slug

`slug`

string

The function slug

## Response

201

The created deployment

::::tabs
:::tab{title="schema"}
Depth
:::

:::tab{title="example"}
:::
::::

## Errors

default

General error

This endpoint can return the standard Neon API error response.

Response fields

- `message` Required. Human-readable error message.
- `code` Required. Machine-readable error code.
- `request_id` Optional. Request identifier for debugging. You can provide one with the `X-Request-ID` header.

Retry guidance

If no response is returned, the request may still have reached the server. This is why retry safety depends on the method and status code.

Idempotent methods (`GET`, `HEAD`, `OPTIONS`) are generally safe to retry after a network error or timeout. Non-idempotent methods (`POST`, `PATCH`, `DELETE`, `PUT`) can change state, so avoid automatic retries unless your workflow can tolerate duplicate effects.

Responses with `423 Locked` or `503 Service Unavailable` are safe to retry. `423 Locked` means the resource is temporarily locked, usually because another operation is in progress.

## Related pages

- [Create a trigger](./apis-sdks-reference-api-functions-create-project-branch-trigger.md)
- [Delete a custom domain from a branch](./apis-sdks-reference-api-functions-delete-project-branch-custom-domain.md)
- [Delete a function on the branch](./apis-sdks-reference-api-functions-delete-project-branch-function.md)
- [Delete a trigger](./apis-sdks-reference-api-functions-delete-project-branch-trigger.md)
- [Get a trigger](./apis-sdks-reference-api-functions-get-project-branch-trigger.md)
- [Get function details](./apis-sdks-reference-api-functions-get-project-branch-function.md)
- [List functions on the branch](./apis-sdks-reference-api-functions-list-project-branch-functions.md)
- [List the custom domains on a branch](./apis-sdks-reference-api-functions-list-project-branch-custom-domains.md)
- [List triggers on the branch](./apis-sdks-reference-api-functions-list-project-branch-triggers.md)
- [Register a custom domain on a branch](./apis-sdks-reference-api-functions-register-project-branch-custom-domain.md)

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