You will need to import dart:convert:
import 'dart:convert';
Inline example
String rawJson = '{"name":"Mary","age":30}';
Map<String, dynamic> map = jsonDecode(rawJson); // import 'dart:convert';
String name = map['name'];
int age = map['age'];
Person person = Person(name, age);
Note: When I was doing this in VS Code for server side Dart I had to specify the type:
Map<String, dynamic> map = jsonDecode(rawJson) as Map<String, dynamic>;
Model class example
The model class includes the map conversion logic:
class Person {
String name;
int age;
Person(this.name, this.age);
// named constructor
Person.fromJson(Map<String, dynamic> json)
: name = json['name'],
age = json['age'];
// method
Map<String, dynamic> toJson() {
return {
'name': name,
'age': age,
};
}
}
And the JSON conversion is done like this:
String rawJson = '{"name":"Mary","age":30}';
Map<String, dynamic> map = jsonDecode(rawJson);
Person person = Person.fromJson(map);
See my full answer here.
Generating the serialization code
It is easy to make errors when writing the serialization code, so it is generally recommended to use the json_serializable package by the Dart Team. However, you can read about the pros and cons of the different methods here.
If you want even more options you can also check out the built_value package.
See also
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
