Basic JSON serialization in Flutter is very simple. Flutter has a built-in dart:convert library that includes a straightforward JSON encoder and decoder . The following sample JSON implements a simple user model.
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json_serializable: This is provided to a Dart build system. It generates code when it finds annotated members in a class defined with json_annotation . json_annotation: It defines the annotation used by Json_serializable to create JSON serialization, deserialization type of code.26 Haz 2021
Read moreWhat is JSON serialization in Dart?
JSON serialization with code generation means having an external library generate the encoding boilerplate for you . After some initial setup, you run a file watcher that generates the code from your model classes.
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If you intend to save user data to the shared preferences or local storage in your Flutter application, you will need to serialize it manually. This is because both methods only support a limited selection of primitive object types and your object will probably not fall into any category.
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To deserialize a list of objects from JSON in flutter follows the below steps:
Read moreWhat is JSON encode in flutter?
jsonEncode function Null safety Converts object to a JSON string . If value contains objects that are not directly encodable to a JSON string (a value that is not a number, boolean, string, null, list or a map with string keys), the toEncodable function is used to convert it to an object that must be directly encodable.
Read moreHow do you convert JSON to string in darts?
By looking at the dart:convert documentation, you’ll see that you can decode the JSON by calling the jsonDecode() function, with the JSON string as the method argument . Map<String, dynamic> user = jsonDecode(jsonString); print(‘Howdy, ${user[‘name’]}!
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