---
type: api
title: Create a runtime field
description: Create a runtime field for a data view. Runtime fields are computed at query time using a [Painless script](https://www.elastic.co/docs/explore-analyze/scripting/modules-scripting-painless) and do not require reindexing. If no `script` is provided, the runtime field returns the corresponding value from the document `_source`.
url: https://www.elastic.co/elastic/docs-builder/docs/4641/api/doc/kibana/v0/operation/operation-createruntimefielddefault
resource: https://www.elastic.co/elastic/docs-builder/docs/4641/api/doc/kibana/v0/operation/operation-createruntimefielddefault
products:
  - Kibana
---

# Create a runtime field

Authentication: required

- Server: `https://{kibana_url}`

## Paths

- `POST` `/api/data_views/data_view/{viewId}/runtime_field`

#### Path parameters

- `viewId` (string) — required
  An identifier for the data view.
  Example: `ff959d40-b880-11e8-a6d9-e546fe2bba5f`

## Description

Create a runtime field for a data view. Runtime fields are computed at query time using a [Painless script](https://www.elastic.co/docs/explore-analyze/scripting/modules-scripting-painless) and do not require reindexing. If no `script` is provided, the runtime field returns the corresponding value from the document `_source`.

## Header parameters

- `kbn-xsrf` (string) — required
  Cross-site request forgery protection

## Request body

`application/json`

- `name` (string) — required
  The name for a runtime field.
- `runtimeField` (object) — required
  The runtime field definition object.

## Response

Indicates a successful call.

`application/json`

Type: `object`

## Code examples

#### Console

```console
POST kbn://api/data_views/data_view/{viewId}/runtime_field
{"name":"hour_of_day","runtimeField":{"type":"long","script":{"source":"emit(doc['timestamp'].value.getHour())"}}}
```

#### curl

```curl
curl \
  -X POST "${KIBANA_URL}/api/data_views/data_view/${DATA_VIEW_ID}/runtime_field" \
  -H "Authorization: ApiKey ${API_KEY}" \
  -H "kbn-xsrf: true" \
  -H "Content-Type: application/json" \
  -d '{"name":"hour_of_day","runtimeField":{"type":"long","script":{"source":"emit(doc['"'"'timestamp'"'"'].value.getHour())"}}}'
```

## Response examples

#### The API returns created runtime field object array and updated data view object.

`application/json`

The response includes the newly created runtime field as an array and the full updated data view object.

```json
{
  "data_view": {
    "...": "null"
  },
  "fields": [
    "..."
  ]
}
```