Question 77132 in Flutter Question posted in
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Dart: How to convert json string without quotes to Map – Flutter

how to convert json string without quotes to Map.

I tried below code on https://dartpad.dev/ but not working:

import 'dart:convert';

void main() async {
  final String raw = "{data: {name: joy, tags: aa,bb, city: jakarta}}";
  print('Test 1: $raw');
  
  final Map<dynamic, dynamic> result = json.decode(raw);
  print('Test 2: $result');
}

And this is the error for above code:

Test 1: {data: {name: joy, tags: aa,bb, city: jakarta}}
Uncaught Error: FormatException: SyntaxError: Expected property name or '}' in JSON at position 1

And I know this because my json is invalid. How to convert my json string without quotes to json string with quotes?

Actual result is:

{data: {name: joy, tags: aa,bb, city: jakarta}}

Expected result is:

{"data": {"name": "joy", "tags": "aa,bb", "city": "jakarta"}}
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I fix it with below code, refer from this answer: https://stackoverflow.com/a/71025841/21092577

    import 'dart:convert';

void main() async {
  
  String raw = "{data: {name: joy, tags: aa,bb, city: jakarta}}";
  print("Test 0: $raw");
  
  String jsonString = _convertToJsonStringQuotes(raw: raw);
  print("Test 1: $jsonString");
  
  final Map<dynamic, dynamic> result = json.decode(jsonString);
  print('Test 2: $result');
  
}


String _convertToJsonStringQuotes({required String raw}) {
    String jsonString = raw;

    /// add quotes to json string
    jsonString = jsonString.replaceAll('{', '{"');
    jsonString = jsonString.replaceAll(': ', '": "');
    jsonString = jsonString.replaceAll(', ', '", "');
    jsonString = jsonString.replaceAll('}', '"}');

    /// remove quotes on object json string
    jsonString = jsonString.replaceAll('"{"', '{"');
    jsonString = jsonString.replaceAll('"}"', '"}');

    /// remove quotes on array json string
    jsonString = jsonString.replaceAll('"[{', '[{');
    jsonString = jsonString.replaceAll('}]"', '}]');

    return jsonString;
  }

  2. 0

    Your json is invalid use https://jsonlint.com/ to validate

    The json should be

    {
    "data": {
        "name": "joy",
        "tags": "aa,bb",
        "city": "Jakarta"
    }
}

    DEMO

    import 'dart:convert';

void main() async {
  final String raw = "{" +
"   "data": {" +
"       "name": "joy"," +
"       "tags": "aa,bb"," +
"       "city": "Jakarta"" +
"   }" +
"}";


  Map<dynamic, dynamic> resultMap = json.decode(raw);
  print('Test 3: $resultMap');
}
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