Analysis of Vue JSON serialization problems and solutions

In front-end development, it is often necessary to transfer data to or obtain data from the back-end. At this time, serialization and deserialization of data need to be used, and JSON (JavaScript Object Notation) is a very popular data transmission format. In the Vue framework, we usually use tools such as axios or fetch to obtain data from the backend through AJAX, and then bind the data to Vue components. However, sometimes we encounter JSON serialization problems, especially when When data in JSON such as Date type cannot be serialized. In this article, we will discuss JSON serialization issues and their solutions.

First, we need to understand common JSON serialization issues. In JavaScript, we can serialize JavaScript objects into JSON strings through the JSON.stringify method, for example:

let obj = {
  name: 'John',
  age: 30,
  birthday: new Date(1990, 1, 1)
};

let json = JSON.stringify(obj);
console.log(json); // {"name":"John","age":30,"birthday":"1990-02-01T00:00:00.000Z"}

The above code serializes a JavaScript object containing Date type properties into a JSON string, but we It was found that the Date type was serialized into a string. If we directly parse this JSON string into a JavaScript object, then it will convert the Date type string into a Date object, but if we pass this JSON string to the backend, when the backend parses the JSON string, Date type strings will not be parsed correctly.

So the question is, how do we serialize a JavaScript object containing a Date type or other types that cannot be serialized? At this time, we can use the second parameter of the JSON.stringify method, which is the replacer parameter, to customize the serialization process.

The replacer parameter can be a function. This function receives two parameters: attribute name and attribute value, and then returns a new attribute value to replace the original attribute value. For example:

let obj = {
  name: 'John',
  age: 30,
  birthday: new Date(1990, 1, 1)
};

let json = JSON.stringify(obj, function(key, value) {
  if (key === 'birthday') {
    return value.toISOString();
  } else {
    return value;
  }
});

console.log(json); // {"name":"John","age":30,"birthday":"1990-02-01T00:00:00.000Z"}

In the above code, we define a replacer function. If the current attribute name is birthday, use the toISOString method of Date to convert it into an ISO format string so that the backend can parse it correctly. Otherwise, Return the original attribute value. In this way, we can correctly serialize JavaScript objects containing Date types.

In addition to the replacer parameter, the JSON.stringify method also has a space parameter, which can be used to define the format of the output JSON string content, for example:

let obj = {
  name: 'John',
  age: 30,
  birthday: new Date(1990, 1, 1)
};

let json = JSON.stringify(obj, null, 2);

console.log(json);
/*
{
  "name": "John",
  "age": 30,
  "birthday": "1990-02-01T00:00:00.000Z"
}
*/

In the above code, we use space Setting the parameter to 2 makes the output JSON string indented and more beautiful.

To summarize, when we use axios or other tools to obtain data in Vue, if the data contains Date type and other data that cannot be directly serialized, we can use the replacer parameter of the JSON.stringify method to customize it. Serialization rules to correctly pass data to the backend.

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