How to set key name in nodejs writing interface

Node.js is a very popular back-end development language, often used for writing interfaces and server-side applications. When writing an interface, setting the key name is also an important issue. This article will introduce how to set the key name in Node.js.

In Node.js, we usually use JSON data format to transfer data. JSON is a lightweight data interchange format that stores data in the form of key-value pairs. In JSON, the key name is a string type and needs to be wrapped in double quotes. For example:

{
    "name": "Tom",
    "age": 20,
    "gender": "male"
}

In Node.js, we can set the key name in the following way:

1. Set directly

Setting the key name directly is the best way A common way. We can directly specify the key name through the dot operator or square bracket operator, such as:

const obj = {};
obj.name = "Tom";
obj["age"] = 20;
obj.gender = "male";

In the above code, we created an empty object obj and set its key names one by one. As you can see, when setting the key name directly, you need to pay attention to the following points:

• The key name must be a string;
• If the key name contains special characters, such as spaces, Chinese, etc. need to be set using the square bracket operator.

2. Setting through variables

If we need to dynamically set the key name, we can use variables to replace the key name, such as:

const obj = {};
const key = "name";
obj[key] = "Tom";

Above In the code, we set the key name through the variable key, so that the key name can be set dynamically.

3. Setting through computed property names in ES6

In ES6, we can use computed property names to set key names. Computed property names are a way to dynamically set key names. You can use expressions to calculate key names. For example:

const key1 = "name";
const key2 = "age";
const obj = {[key1]: "Tom", [key2]: 20};

In the above code, we use the calculated property name in ES6 to set the key name. As you can see, the calculated property name needs to be enclosed in square brackets, and a variable is used to calculate the key name. . This approach can simplify the code and improve readability.

4. Set by the Object.defineProperty method

Object.defineProperty is a powerful method that can set some properties of an object, including key names. For example:

const obj = {};
Object.defineProperty(obj, "name", {
    value: "Tom",
    writable: false,
    enumerable: true,
    configurable: true
});

In the above code, we use the Object.defineProperty method to set the properties of the object. You can see that this method needs to pass in three parameters:

• To set The object;
• The attribute name to be set;
• The descriptor object of the attribute, including value, writability, enumerability, configurability, etc.

Although this method is more complicated, it can finely control the properties of the object and has certain usage value.

Summary

The above are several ways to set key names in Node.js. Each method has its applicable scenarios. During development, we need to choose an appropriate way to set the key name according to the actual situation, so as to make the code more concise and efficient.

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