converting string to map in dart

I wanted to convert a string to map.

String value = "{first_name : fname,last_name : lname,gender : male, location : { state : state, country : country, place : place} }"

into

Map = {
first_name : fname,
last_name : lname,
gender : male,
location = {
  state : state, 
  country : country, 
  place : place
 }
}

How do I convert the string into a map<String, dynamic> where the value consists of string, int, object, and boolean?

I wanted to save the string to a file and obtain the data from the file.

That's not possible.

If you can change the string to valid JSON, you can use

import 'dart:convert';
...
Map valueMap = json.decode(value);
// or
Map valueMap = jsonDecode(value);

The string would need to look like

{"first_name" : "fname","last_name" : "lname","gender" : "male", "location" : { "state" : "state", "country" : "country", "place" : "place"} }

You would have to change the way you create the string.

I'm guessing you are creating the string using the yourMap.toString() method. You should rather use json.encode(yourMap), which converts your map to valid JSON, which you can the parse with json.decode(yourString).

create two objects

class User {
  final String firstName;
  final String lastName;
  final String gender;
  final location;

  User({
    this.firstName,
    this.lastName,
    this.gender,
    this.location,
  });

  User.fromJson(Map json)
      : firstName = json['firstName'],
        lastName = json['lastName'],
        gender = json['gender'],
        location = Location.fromJson(json['location']);
}

class Location {
  final String state;
  final String country;
  final String place;

  Location({
    this.state,
    this.country,
    this.place,
  });

  Location.fromJson(Map json)
      : state = json['state'],
        country = json['country'],
        place = json['place'];
}

then use it like this

var user = User.fromJson(value);
print(user.firstName);

or convert it to list like this

var user = User.fromJson(value).toList();

Make a wrapper class for the location where you define the methods fromMap, toMap

you can do like this ->

import 'dart:convert'; ... > if your data like this ** {'bus1':'100Tk','bus2':'150TK','bus3':'200TK'}

**;

then you can do like this ->

Map valueMap = json.decode(value);

// or

Map valueMap = jsonDecode(value);

> or if like this ->var data = {'1':'100TK','2':'200TK','3':'300TK'};

var dataSp = data.split(',');
Map<String,String> mapData = Map();
dataSp.forEach((element) => mapData[element.split(':')[0]] = element.split(':')[1]);

> Note: Map first value was Int that's why I did that.

Use below method
just pass String json data it will give Map data

jsonStringToMap(String data){
      List<String> str = data.replaceAll("{","").replaceAll("}","").replaceAll("\"","").replaceAll("'","").split(",");
      Map<String,dynamic> result = {};
      for(int i=0;i<str.length;i++){
        List<String> s = str[i].split(":");
        result.putIfAbsent(s[0].trim(), () => s[1].trim());
      }
      return result;
    }