Flutter: How to convert a List to JSON

Question

I am trying to convert a list to Json and sent this json to DB.

My list is as following

List<DeviceInfo> deviceInfoList = [];

class DeviceInfo {
  final String platform;
  final String deviceModel;
  final bool isPhysicalDevice;
  final String deviceId;
  final String imei;
  final String meid;
  final String platformVersion;
  final String projectVersion;
  final String projectCode;
  final String projectAppID;
  final String projectName;

  DeviceInfo(
      {this.platform,
      this.platformVersion,
      this.deviceModel,
      this.isPhysicalDevice,
      this.deviceId,
      this.imei,
      this.meid,
      this.projectVersion,
      this.projectCode,
      this.projectAppID,
      this.projectName});
}

My list contain String and boolean, I had go through this example don't know how to Map string and bool in that map function. Can anyone help me with this?

Does this answer your question? [Flutter Json Encode List](https://stackoverflow.com/questions/55024549/flutter-json-encode-list) — luismiguelss, Nov 25 '19 at 18:07
@luismiguelss My list contain string and Boolean, how can i map it to the function in the link you provided. Map toJson(){ return {}} — Alvin John Babu, Nov 25 '19 at 18:24
You can still process the boolean as a String, check [this answer](https://stackoverflow.com/questions/55058117/convert-listt-into-json-in-flutter) — luismiguelss, Nov 25 '19 at 18:30
Does this answer your question? [Convert List into json in flutter](https://stackoverflow.com/questions/55058117/convert-listt-into-json-in-flutter) — Farhana Naaz Ansari, Jan 20 '20 at 05:39

score 3 · Answer 1 · answered Nov 25 '19 at 18:18

Map<String,dynamic> toJson(){
    return {
      "name": this.name,
      "number": this.number,
      "surname": this.surname,
    };
  }

static List encondeToJson(List<DeviceInfo>list){
    List jsonList = List();
    list.map((item)=>
      jsonList.add(item.toJson())
    ).toList();
    return jsonList;
}

List jsonList = Device.encondeToJson(deviceInfoList);
print("jsonList: ${jsonList}");

Is the most short way that I remember.

score 1 · Answer 2 · answered Nov 25 '19 at 18:16

Couple of options that will help encoding and decoding from JSON: the json_serializable package is a great way to have the boilerplate serialize/deserialize code generated for you. There's examples of how to use this (and built_value, which is powerful, but more complicated to use) in the Flutter samples repo.

Flutter: How to convert a List to JSON

2 Answers2