Create a group custom field
curl --request POST \
--url https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType} \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"type": "textField",
"name": "<string>"
}
'const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({type: 'textField', name: '<string>'})
};
fetch('https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}"
payload = {
"type": "textField",
"name": "<string>"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)require 'uri'
require 'net/http'
url = URI("https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"type\": \"textField\",\n \"name\": \"<string>\"\n}"
response = http.request(request)
puts response.read_bodypackage main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}"
payload := strings.NewReader("{\n \"type\": \"textField\",\n \"name\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", 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(string(body))
}<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'type' => 'textField',
'name' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}{
"data": {
"name": "Status",
"type": "singleSelect",
"options": [
{
"id": "gcfo_bc984b3f-0386-434d-82d7-a91eb6badd71",
"label": "Active",
"color": "#ffffff"
},
{
"id": "gcfo_28cf7f0a-fb0a-4b6b-9d47-3f5f2e3f1a3f",
"label": "Inactive",
"color": "#000000"
}
]
}
}{
"error": {
"code": "INVALID_REQUEST",
"message": "The request was invalid.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#bad-request",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "UNAUTHORIZED",
"message": "No valid API key provided.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#unauthorized",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "FORBIDDEN",
"message": "The API key doesn’t have permissions to perform the request.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#forbidden",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "RESOURCE_NOT_FOUND",
"message": "The requested resource was not found.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#not-found",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "IDEMPOTENCY_REQUEST_IN_PROGRESS",
"message": "A request with the same Idempotency-Key is still being processed. Retry once it has completed.",
"documentationUrl": "https://developer.folk.app/api-reference/idempotency#errors",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "UNPROCESSABLE_ENTITY",
"message": "Invalid query parameters",
"documentationUrl": "https://developer.folk.app/api-reference/errors#unprocessable-entity",
"details": {
"issues": [
{
"code": "too_small",
"minimum": 1,
"type": "number",
"inclusive": true,
"exact": false,
"message": "Number must be greater than or equal to 1",
"path": [
"limit"
]
}
]
},
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "TOO_MANY_REQUESTS",
"message": "You have exceeded your rate limit.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#rate-limiting",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z",
"details": {
"policy": "burst",
"limit": 20,
"remaining": 0,
"windowSeconds": 2,
"retryAfter": "2025-10-01T12:00:02.000Z",
"policies": [
{
"policy": "default",
"limit": 600,
"remaining": 412,
"windowSeconds": 60,
"retryAfter": "2025-10-01T12:01:00.000Z"
},
{
"policy": "burst",
"limit": 20,
"remaining": 0,
"windowSeconds": 2,
"retryAfter": "2025-10-01T12:00:02.000Z"
}
]
}
}
}{
"error": {
"code": "INTERNAL_SERVER_ERROR",
"message": "An internal server error occurred.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#internal-server-error",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "SERVICE_UNAVAILABLE",
"message": "The service is currently unavailable.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#service-unavailable",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}Group custom fields
Create a group custom field
Creates a new group custom field for an entity type.
POST
/
v1
/
groups
/
{groupId}
/
custom-fields
/
{entityType}
Create a group custom field
curl --request POST \
--url https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType} \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"type": "textField",
"name": "<string>"
}
'const options = {
method: 'POST',
headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
body: JSON.stringify({type: 'textField', name: '<string>'})
};
fetch('https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}"
payload = {
"type": "textField",
"name": "<string>"
}
headers = {
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)require 'uri'
require 'net/http'
url = URI("https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"type\": \"textField\",\n \"name\": \"<string>\"\n}"
response = http.request(request)
puts response.read_bodypackage main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}"
payload := strings.NewReader("{\n \"type\": \"textField\",\n \"name\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", 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(string(body))
}<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://api.folk.app/v1/groups/{groupId}/custom-fields/{entityType}",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'type' => 'textField',
'name' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}{
"data": {
"name": "Status",
"type": "singleSelect",
"options": [
{
"id": "gcfo_bc984b3f-0386-434d-82d7-a91eb6badd71",
"label": "Active",
"color": "#ffffff"
},
{
"id": "gcfo_28cf7f0a-fb0a-4b6b-9d47-3f5f2e3f1a3f",
"label": "Inactive",
"color": "#000000"
}
]
}
}{
"error": {
"code": "INVALID_REQUEST",
"message": "The request was invalid.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#bad-request",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "UNAUTHORIZED",
"message": "No valid API key provided.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#unauthorized",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "FORBIDDEN",
"message": "The API key doesn’t have permissions to perform the request.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#forbidden",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "RESOURCE_NOT_FOUND",
"message": "The requested resource was not found.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#not-found",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "IDEMPOTENCY_REQUEST_IN_PROGRESS",
"message": "A request with the same Idempotency-Key is still being processed. Retry once it has completed.",
"documentationUrl": "https://developer.folk.app/api-reference/idempotency#errors",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "UNPROCESSABLE_ENTITY",
"message": "Invalid query parameters",
"documentationUrl": "https://developer.folk.app/api-reference/errors#unprocessable-entity",
"details": {
"issues": [
{
"code": "too_small",
"minimum": 1,
"type": "number",
"inclusive": true,
"exact": false,
"message": "Number must be greater than or equal to 1",
"path": [
"limit"
]
}
]
},
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "TOO_MANY_REQUESTS",
"message": "You have exceeded your rate limit.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#rate-limiting",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z",
"details": {
"policy": "burst",
"limit": 20,
"remaining": 0,
"windowSeconds": 2,
"retryAfter": "2025-10-01T12:00:02.000Z",
"policies": [
{
"policy": "default",
"limit": 600,
"remaining": 412,
"windowSeconds": 60,
"retryAfter": "2025-10-01T12:01:00.000Z"
},
{
"policy": "burst",
"limit": 20,
"remaining": 0,
"windowSeconds": 2,
"retryAfter": "2025-10-01T12:00:02.000Z"
}
]
}
}
}{
"error": {
"code": "INTERNAL_SERVER_ERROR",
"message": "An internal server error occurred.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#internal-server-error",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}{
"error": {
"code": "SERVICE_UNAVAILABLE",
"message": "The service is currently unavailable.",
"documentationUrl": "https://developer.folk.app/api-reference/errors#service-unavailable",
"requestId": "123e4567-e89b-12d3-a456-426614174000",
"timestamp": "2025-10-01T12:00:00Z"
}
}Authorizations
API key for authentication
Headers
A unique key, such as a UUID, that makes retrying this request safe: a retry with the same key and body returns the original response without running the operation again. Keys are kept for 24 hours after the request completes.
Maximum string length:
255Example:
"8e03978e-40d5-43e8-bc93-6894a57f9324"
Path Parameters
The identifier of the group. You can retrieve a list of group identifiers using the /v1/groups endpoint.
Required string length:
40The entity type the custom fields belong to. It can be person, company, or a custom object name.
Maximum string length:
500Body
application/json
Response
The created group custom field.
A group custom field.
Show child attributes
Show child attributes
Example:
{
"name": "Status",
"type": "singleSelect",
"options": [
{
"id": "gcfo_bc984b3f-0386-434d-82d7-a91eb6badd71",
"label": "Active",
"color": "#ffffff"
},
{
"id": "gcfo_28cf7f0a-fb0a-4b6b-9d47-3f5f2e3f1a3f",
"label": "Inactive",
"color": "#000000"
}
]
}
Example:
["This field is deprecated"]