Flutter: JSON Loop

Question

I have a Json parsing project in Flutter and the Json is as follows:

{
  "Dependents":[
      {
        "Name": "Kim",
        "Relationship": "Parent",
        "Entitlements": [
            {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "IP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Dental": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Optical": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Maternity": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }
        ]
      },
      {
        "Name": "Tim",
        "Relationship": "Spouse",
        "Entitlements": [
            {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "IP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Maternity": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }
        ]
      },
      {
        "Name": "Lim",
        "Relationship": "Child",
        "Entitlements": [
            {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Dental": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Optical": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Maternity": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }
        ]
      },
      {
        "Name": "Xim",
        "Relationship": "Child",
        "Entitlements": [
            {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "IP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }
        ]
      }
    ]
}

As you can see, under the Dependents there are multiple users and under those users they have their own Entitlements.

The problem I am having currently is:

How do I loop through the Entitlements to print out all the maps under that since every user has different Entitlements associated with them.

Kindly assist.

Answer 1

You could use the following snippet:

  void iterateJson(String jsonStr) {
    Map<String, dynamic> myMap = json.decode(jsonStr);
    List<dynamic> entitlements = myMap["Dependents"][0]["Entitlements"];
    entitlements.forEach((entitlement) {
      (entitlement as Map<String, dynamic>).forEach((key, value) {
        print(key);
        (value as Map<String, dynamic>).forEach((key2, value2) {
          print(key2);
          print(value2);
        });
      });
    });
  }

Although you could possibly simplify a little the 'entitlements' field if you don't care about the order by removing the list and leaving just one map:

"Entitlements": {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              },
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              },
              "IP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }