> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.brightmove.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.brightmove.com/_mcp/server.

# Set a custom field's value for an entity

PUT https://app.brightmove.com/ATS/api/v1/udf/{entityTypeId}/{guid}/fields/{fieldGk}
Content-Type: application/json

Sets (or overwrites) this field's value for the entity. body.fieldTypeId must match the field's actual data type as returned by GET .../definitions — this guards against sending a text value to a numeric field, for example. For SELECT fields, body.optionGk selects one of the field's valid options (also from GET .../definitions); for DATE/TIME fields, body.value must be an ISO-8601 timestamp. Only entity types with a registered write handler support this endpoint today (Requirement/Job, Applicant, Client, Office, Contact, Opportunity, Placement).

Reference: https://docs.brightmove.com/public/custom-fields/core/set-value

## Authentication

- `Authorization` header (bearer token, required) — BrightMove OAuth2 client_credentials - use the client_id/client_secret from User > API Keys (or an admin-managed client).

## Request

### Path parameters

- `entityTypeId` (integer, required) — Numeric entity type id (e.g. 5 = Requirement/Job)
- `guid` (string, required) — GUID of the entity to set the value on
- `fieldGk` (long, required) — Numeric id of the field definition, from GET .../definitions

### Body (application/json)

This endpoint expects an UdfValueUpdateRequest.

- `fieldTypeId` (integer, required) — Data type of the field being set. Must match the field's actual definition. 1=Text, 2=Text Area, 3=Checkbox, 4=Select (dropdown), 5=Number, 6=Currency, 7=Date, 10=Time.
- `value` (string, optional) — New value for this field, as a string. Dates/times must be ISO-8601. Not used for Select-type fields — use optionGk instead.
- `optionGk` (long, optional) — Identifier of the option to select, for Select-type fields only.

## Response

### 204

Value set

## Errors

### 404 Not Found Error

No entity found for the supplied GUID

- `any`

## Examples

**Request**

```json
{
  "fieldTypeId": 1
}
```

**SDK Code**

```python
import requests

url = "https://app.brightmove.com/ATS/api/v1/udf/5/c9d82c1c-abcd-1234-ef56-789012345678/fields/42"

payload = { "fieldTypeId": 1 }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.json())
```

```javascript
const url = 'https://app.brightmove.com/ATS/api/v1/udf/5/c9d82c1c-abcd-1234-ef56-789012345678/fields/42';
const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"fieldTypeId":1}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://app.brightmove.com/ATS/api/v1/udf/5/c9d82c1c-abcd-1234-ef56-789012345678/fields/42"

	payload := strings.NewReader("{\n  \"fieldTypeId\": 1\n}")

	req, _ := http.NewRequest("PUT", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://app.brightmove.com/ATS/api/v1/udf/5/c9d82c1c-abcd-1234-ef56-789012345678/fields/42")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"fieldTypeId\": 1\n}"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.put("https://app.brightmove.com/ATS/api/v1/udf/5/c9d82c1c-abcd-1234-ef56-789012345678/fields/42")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"fieldTypeId\": 1\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('PUT', 'https://app.brightmove.com/ATS/api/v1/udf/5/c9d82c1c-abcd-1234-ef56-789012345678/fields/42', [
  'body' => '{
  "fieldTypeId": 1
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://app.brightmove.com/ATS/api/v1/udf/5/c9d82c1c-abcd-1234-ef56-789012345678/fields/42");
var request = new RestRequest(Method.PUT);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"fieldTypeId\": 1\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = ["fieldTypeId": 1] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://app.brightmove.com/ATS/api/v1/udf/5/c9d82c1c-abcd-1234-ef56-789012345678/fields/42")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "PUT"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```