What is Dart QuickType

Quicktype Dart is a code generation tool that generates Dart classes and types from JSON data, providing a fast and efficient way to parse and manipulate data in Dart applications. In this section, we will discuss how Quicktype Dart works and provide some examples to illustrate its usage.

How Quicktype Dart Works

Quicktype Dart uses a combination of machine learning and code generation techniques to analyze JSON data and generate optimized Dart code. The process involves the following steps:

1. Analyze the input data: Quicktype Dart reads the JSON data and analyzes its structure to identify the various data types and structures.
2. Generate the code: Based on the analysis, Quicktype Dart generates optimized Dart code that represents the data types and structures in the input data.
3. Output the code: Quicktype Dart outputs the generated code to a file or console, making it easy to use in your Dart application.

Examples of Quicktype Dart

Here are some examples of how Quicktype Dart can be used in practice:

Example 1: Parsing JSON Data

Consider the following JSON data:

{
    "name": "John",
    "age": 30,
    "city": "New York"
}

To generate a Dart class to parse this JSON data using Quicktype Dart, you can run the following command:

quicktype --src json --lang dart --out Person.dart person.json

This generates a Dart class named Person in a file named Person.dart that you can use to parse the JSON data.

class Person {
  String name;
  int age;
  String city;

  Person({
    this.name,
    this.age,
    this.city,
  });

  factory Person.fromJson(Map<String, dynamic> json) => Person(
        name: json["name"],
        age: json["age"],
        city: json["city"],
      );

  Map<String, dynamic> toJson() => {
        "name": name,
        "age": age,
        "city": city,
      };
}

Example 2: Generating Dart Code from YAML Data

Quicktype Dart can also generate Dart code from YAML data. For example, consider the following YAML data:

- name: John
  age: 30
  city: New York
- name: Jane
  age: 25
  city: Los Angeles

To generate a Dart class to parse this YAML data, you can run the following command:

quicktype --src yaml --lang dart --out Person.dart person.yaml

This generates a Dart class named Person in a file named Person.dart that you can use to parse the YAML data.

class Person {
  String name;
  int age;
  String city;

  Person({
    this.name,
    this.age,
    this.city,
  });

  factory Person.fromJson(Map<String, dynamic> json) => Person(
        name: json["name"],
        age: json["age"],
        city: json["city"],
      );

  Map<String, dynamic> toJson() => {
        "name": name,
        "age": age,
        "city": city,
      };
}

Example 3: Customizing Generated Code

Quicktype Dart allows you to customize the generated code using various options. For example, you can specify the name of the generated class using the --class option:

quicktype --src json --lang dart --class Person --out Person.dart person.json

This generates a Dart class named Person in a file named Person.dart that you can use to parse the JSON data.

class Person {
  String name;
  int age;
  String city;

  Person({
    this.name,
   

---

See Also