Feature Flag

The HTTP API can only be used in a server environment.

You can use the HTTP API to check the Feature Flag Decision result for a user.

Authentication is performed using the SDK Key.

• Add the SDK Key to the HTTP header as shown below.

• You can find the SDK Key in the Hackle Dashboard under SDK Integration Info.

X-HACKLE-API-KEY: {YOUR_SERVER_SDK_KEY}

Request

POST https://api.hackle.io/v1/feature-flag

Request Body

Field	Type	Required	Description
featureKey	number	O	Feature Key to evaluate
user	User object	O	User to evaluate

User Object

Field	Type	Required	Description
userId	string	X	User ID (Hackle ID can be used)
deviceId	string	X	Device ID (Hackle ID can be used)
identifiers	object	X	Custom identifier key(string)-value(string) pair
properties	object	X	User Property key(string)-value(string)

Example

curl -i -X POST \
  'https://api.hackle.io/v1/feature-flag' \
  -H 'X-HACKLE-API-KEY: YOUR_SDK_KEY_HERE' \
  -H 'Content-Type: application/json' \
  -d '{
    "featureKey": 42,
    "user": {
      "userId": "19285035",
      "deviceId": "ae2182e0",
      "identifiers": {
        "sessionId": "16930492542",
        "myCustomId": "ff01eae2"
      },
      "properties": {
        "grade": "GOLD",
        "age": 30,
        "isLogin": true
      }
    }
  }'

Response

200 OK

Returns a 200 response and the decision result for a successful request.

Response Body

Field	Type	Description
isOn	boolean	Decision result (true/false)
reason	string	Decision reason
parameters	object	Parameters configured for the decision result

Example

{
  "isOn": "true",
  "reason": "DEFAULT_RULE",
  "parameters": {
    "buttonText": "Purchase",
    "buttonSize": 16
  }
}

400 Bad Request

Returns a 400 status for invalid request information.

401 Unauthorized

Returns a 401 status when the X-HACKLE-API-KEY header value is missing or the SDK Key is invalid.