How to Adding New Data into JSON Dart?

Question

I have a JSON having some data as an array , and I wanna add new data to JSON

This is My JSON structure

```[
{
"id":"JKT020",
"origin_time":"2020-06-30 12:00",
"location":"Jakarta, ID"
}
]```

I want to add new data so it can be like this

 ```[
{
"id":"JKT020",
"origin_time":"2020-06-30 12:00",
"location":"Jakarta, ID",
"flag":1
}
]```

Is it possible ? If it is can anyone tell me how to do that ? Thanks in advance.

And this is what I've been doing so far..

List data = json.decode(response.body);
      for (int i = 0; i < data.length; i++) {
        data.add(data[i]["flag"]=1);
        print("object : " + data[i].toString());
      }
      });

It was printed like I want it, but return error in add line

The error said NoSuchMethodError: Class 'String' has no instance method '[]='

Abhishek Ghaskata · Accepted Answer · 2020-10-15 04:10:33Z

3

First of all, you have to Decode the JSON

var data=json.decode("Your JSON")

Now this is available as a list and map so you can add fields like

data[key]=value;

after that, you have to Encode it using json.encode

var data1=json.encode(data); `

answered Oct 15, 2020 at 4:10

Abhishek Ghaskata

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Comments

Darsh Shah · Accepted Answer · 2020-10-15 18:20:29Z

It's a good idea to get the JSON formatted and mapped to a Model. This will not only help to do null checks but also increase the readability of your code.

You can use a simple Model like

class myModel {
  String id;
  String originTime;
  String location;
  int flag;

  myModel({this.id, this.originTime, this.location, this.flag});

  myModel.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    originTime = json['origin_time'];
    location = json['location'];
    flag = json['flag'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['id'] = this.id;
    data['origin_time'] = this.originTime;
    data['location'] = this.location;
    data['flag'] = this.flag;
    return data;
  }
}

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