How to Display a JavaScript Object in String Format
In JavaScript, it is often necessary to display the content of an object in a readable string format. Similar to the formatted output displayed when a variable is alerted, there are several methods available to achieve this.
SOLUTION 1: Using JSON.stringify()
The native JSON.stringify() method is the most straightforward approach. It converts the object into a JSON string that can be displayed or alerted.
const obj = {
name: "John Doe",
age: 30
};
const str = JSON.stringify(obj);
console.log(str); // Output: {"name":"John Doe","age":30}
To beautify the output with indentation, pass a null value as the second argument.
const str = JSON.stringify(obj, null, 4); // Output:
{
"name": "John Doe",
"age": 30
}
SOLUTION 2: Custom JSON.stringify Replacer (for Circular Structures)
If an object contains circular structures, JSON.stringify() might throw an error. In such cases, a custom replacer function can be used.
const obj = {
name: "John Doe",
age: 30,
children: [
obj // Circular reference
]
};
const replacer = (key, value) => {
if (value === obj) {
return "[Circular]";
}
return value;
};
const str = JSON.stringify(obj, replacer);
console.log(str); // Output: {"name":"John Doe","age":30,"children":["[Circular]"]}
The custom replacer ensures that the circular structure is replaced with a descriptive string to avoid the error.
The above is the detailed content of How to Convert a JavaScript Object to a Readable String?. For more information, please follow other related articles on the PHP Chinese website!
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