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.

A very broad question, but here you'll probably find some answers flutter.io/json — Maximilian Riegler
– Maximilian Riegler, Commented Aug 27, 2018 at 10:35

chemamolins · Accepted Answer · 2018-08-29 09:31:27Z

30

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"
              }
            }

edited Aug 29, 2018 at 9:31

answered Aug 27, 2018 at 11:17

chemamolins

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3 Comments

Asyraf Dayan Over a year ago

Thanks. I will give this a try. But where do i set the url in the iterateJson method?

Asyraf Dayan Over a year ago

Because I am using a future builder in the class that parses this JSON.

chemamolins Over a year ago

Well, in your question you asked for a way to iterate the entitlements, and this is one way to do it. We lack perspective of your application. If your future returns the json string you can parse the string inside the future builder and build your widgets from there.

Roger Cuesta · Accepted Answer · 2018-08-27 11:37:26Z

7

You have information there : http://cogitas.net/parse-json-dart-flutter/

Example from the page :

void _parseJsonForCrossword(String jsonString) {
Map decoded = JSON.decode(jsonString);

String name = decoded['name'];
 print(name);

 int id = decoded['id'];
 print(id.toString());

 for (var word in decoded['across']) {
   print(word['number'].toString());
   print(word['word']);
 }
}

answered Aug 27, 2018 at 11:37

Roger Cuesta

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