> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://fyno.io/docs/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://fyno.io/docs/_mcp/server. # Append Values to List POST https://api.fyno.io/v1/{WSID}/{version}/profiles/properties/list-append Content-Type: application/json This API enables you to append values to list type properties of your users listed in your [User Profiles](../user-profiles-overview). If the user with distinct ID doesn't exist, it creates a new user with the provided distinct ID and updates values for all the provided properties. **Note:** If a [property was not created earlier](../adding-new-user-property#how-to-add-a-new-user-property-from-user-profile-page), it will create a new property and the data type of the property will set to `List`. For example, if you `$append` a new property called `order_ids=245`, it will create the `order_ids` property with `List` type and value `[245]`. A list may contain only unique values, so if a value already exists, and you try to add the same value, it will be ignored. You can append values with the following data types: - **String:** Can be alphanumeric and contain a maximum of 255 characters. Example: `products_order=['iPhone 16 Pro', 'iPad 32 GB']`. - **Number:** Can be an integer or a decimal. Example: `purchase_amount=[23000, 20.34]`. - **Date:** Must be in ISO 8601 format: `YYYY-MM-DDTHH:MM:SS.sssZ`. Example: `membership_date=2020-10-01T18:30:00.000Z` or `membership_date=2020-10-01T18:30:00Z` or `membership_date=2020-10-01T18:30:00.000+05:30` or `membership_date=2020-10-01T18:30:00+02:00` or `membership_date=2020-10-01`. You can append only one value to a property at a time. Although not recommended, a list property can contain a mix of different data types. These user properties can be used to filter your users for creating [user cohorts](../creating-cohorts) and [campaigns](../campaign_creation#creating-a-campaign-using-cohort). Reference: https://fyno.io/docs/api-reference/append-values-to-list ## Authentication - `Authorization` header (bearer token, required) — Enter your API Key. If you don't have it already, you can create one from the API Keys page within your Fyno account ## Request ### Path parameters - `WSID` (string, required) — Enter your workspace ID. You can obtain this value from the API Keys page within your Fyno account. - `version` (string, required) — Specify the version for which you would like to update the user property. ### Body (application/json) This endpoint expects an append_to_user_property. - `$append` (map from string to AppendToUserPropertyFields, required) — Enter the property name as JSON key and the numeric or string value to append as JSON value - `distinct_id` (string, required) — Enter the distinct ID that you use to identify the recipient. ## Response ### 202 Request has been accepted and will be processed asynchronously. - `request_id` (string, required) ## Errors ### 400 Bad Request Error $append object is empty - `_message` (string, required) - `status` (string, required) ### 401 Unauthorized Error API Key or Workspace ID is invalid. User is unauthorised. - `_message` (string, required) - `status` (string, required) ## Types ### AppendToUserPropertyFields ## Examples **Request** ```json { "$append": { "property_1": "some text", "property_2": 123, "property_3": 45.67, "property_4": "2020-10-01T18:30:00.000Z", "property_5": "2021-12-01", "property_n": "2021-11-01T13:35:00+02:00" }, "distinct_id": "XXXXXXXX" } ``` **Response** ```json { "request_id": "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX" } ``` **SDK Code** ```python import requests url = "https://api.fyno.io/v1/FYXXXXXXXX/version/profiles/properties/list-append" payload = { "$append": { "property_1": "some text", "property_2": 123, "property_3": 45.67, "property_4": "2020-10-01T18:30:00.000Z", "property_5": "2021-12-01", "property_n": "2021-11-01T13:35:00+02:00" }, "distinct_id": "XXXXXXXX" } headers = { "Authorization": "Bearer ", "Content-Type": "application/json" } response = requests.post(url, json=payload, headers=headers) print(response.json()) ``` ```javascript const url = 'https://api.fyno.io/v1/FYXXXXXXXX/version/profiles/properties/list-append'; const options = { method: 'POST', headers: {Authorization: 'Bearer ', 'Content-Type': 'application/json'}, body: '{"$append":{"property_1":"some text","property_2":123,"property_3":45.67,"property_4":"2020-10-01T18:30:00.000Z","property_5":"2021-12-01","property_n":"2021-11-01T13:35:00+02:00"},"distinct_id":"XXXXXXXX"}' }; 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://api.fyno.io/v1/FYXXXXXXXX/version/profiles/properties/list-append" payload := strings.NewReader("{\n \"$append\": {\n \"property_1\": \"some text\",\n \"property_2\": 123,\n \"property_3\": 45.67,\n \"property_4\": \"2020-10-01T18:30:00.000Z\",\n \"property_5\": \"2021-12-01\",\n \"property_n\": \"2021-11-01T13:35:00+02:00\"\n },\n \"distinct_id\": \"XXXXXXXX\"\n}") req, _ := http.NewRequest("POST", url, payload) req.Header.Add("Authorization", "Bearer ") req.Header.Add("Content-Type", "application/json") res, _ := http.DefaultClient.Do(req) defer res.Body.Close() body, _ := io.ReadAll(res.Body) fmt.Println(res) fmt.Println(string(body)) } ``` ```ruby require 'uri' require 'net/http' url = URI("https://api.fyno.io/v1/FYXXXXXXXX/version/profiles/properties/list-append") http = Net::HTTP.new(url.host, url.port) http.use_ssl = true request = Net::HTTP::Post.new(url) request["Authorization"] = 'Bearer ' request["Content-Type"] = 'application/json' request.body = "{\n \"$append\": {\n \"property_1\": \"some text\",\n \"property_2\": 123,\n \"property_3\": 45.67,\n \"property_4\": \"2020-10-01T18:30:00.000Z\",\n \"property_5\": \"2021-12-01\",\n \"property_n\": \"2021-11-01T13:35:00+02:00\"\n },\n \"distinct_id\": \"XXXXXXXX\"\n}" response = http.request(request) puts response.read_body ``` ```java import com.mashape.unirest.http.HttpResponse; import com.mashape.unirest.http.Unirest; HttpResponse response = Unirest.post("https://api.fyno.io/v1/FYXXXXXXXX/version/profiles/properties/list-append") .header("Authorization", "Bearer ") .header("Content-Type", "application/json") .body("{\n \"$append\": {\n \"property_1\": \"some text\",\n \"property_2\": 123,\n \"property_3\": 45.67,\n \"property_4\": \"2020-10-01T18:30:00.000Z\",\n \"property_5\": \"2021-12-01\",\n \"property_n\": \"2021-11-01T13:35:00+02:00\"\n },\n \"distinct_id\": \"XXXXXXXX\"\n}") .asString(); ``` ```php request('POST', 'https://api.fyno.io/v1/FYXXXXXXXX/version/profiles/properties/list-append', [ 'body' => '{ "$append": { "property_1": "some text", "property_2": 123, "property_3": 45.67, "property_4": "2020-10-01T18:30:00.000Z", "property_5": "2021-12-01", "property_n": "2021-11-01T13:35:00+02:00" }, "distinct_id": "XXXXXXXX" }', 'headers' => [ 'Authorization' => 'Bearer ', 'Content-Type' => 'application/json', ], ]); echo $response->getBody(); ``` ```csharp using RestSharp; var client = new RestClient("https://api.fyno.io/v1/FYXXXXXXXX/version/profiles/properties/list-append"); var request = new RestRequest(Method.POST); request.AddHeader("Authorization", "Bearer "); request.AddHeader("Content-Type", "application/json"); request.AddParameter("application/json", "{\n \"$append\": {\n \"property_1\": \"some text\",\n \"property_2\": 123,\n \"property_3\": 45.67,\n \"property_4\": \"2020-10-01T18:30:00.000Z\",\n \"property_5\": \"2021-12-01\",\n \"property_n\": \"2021-11-01T13:35:00+02:00\"\n },\n \"distinct_id\": \"XXXXXXXX\"\n}", ParameterType.RequestBody); IRestResponse response = client.Execute(request); ``` ```swift import Foundation let headers = [ "Authorization": "Bearer ", "Content-Type": "application/json" ] let parameters = [ "$append": [ "property_1": "some text", "property_2": 123, "property_3": 45.67, "property_4": "2020-10-01T18:30:00.000Z", "property_5": "2021-12-01", "property_n": "2021-11-01T13:35:00+02:00" ], "distinct_id": "XXXXXXXX" ] as [String : Any] let postData = JSONSerialization.data(withJSONObject: parameters, options: []) let request = NSMutableURLRequest(url: NSURL(string: "https://api.fyno.io/v1/FYXXXXXXXX/version/profiles/properties/list-append")! as URL, cachePolicy: .useProtocolCachePolicy, timeoutInterval: 10.0) request.httpMethod = "POST" 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() ```