How to Convert a JSON String to a Map in Dart

How to Convert a JSON String to a Map in Dart ?

Answer

To convert a JSON string to a map in Dart, you can use the 'dart:convert' library, which provides the jsonDecode function to parse JSON data into a map.

✐ Examples

1 Converting a JSON String to a Map

We can convert a JSON string to a map in Dart by using the 'dart:convert' library's jsonDecode function to parse the JSON string and then converting the result into a Map.

For example,

We start by importing the 'dart:convert' library.
We define a JSON string containing key-value pairs.
We use the jsonDecode function to parse the JSON string into a map.
We print the resulting map to the console to verify the conversion.

Dart Program

import 'dart:convert';

void main() {
    // Define a JSON string
    String jsonString = '{"1": 10, "2": 20, "3": 30, "4": 40, "5": 50}';

    // Parse the JSON string into a map
    Map<String, dynamic> myMap = jsonDecode(jsonString);

    // Print the resulting map
    print('Map from JSON string:');
    myMap.forEach((key, value) {
        print('$key: $value');
    });
}

Output

Map from JSON string:
1: 10
2: 20
3: 30
4: 40
5: 50

Summary

In this tutorial, we learned How to Convert a JSON String to a Map in Dart language with well detailed examples.

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