How to convert an array of objects into a JSON string array using JavaScript

In JavaScript, converting an array of objects into a JSON string is an extremely common task. This task typically requires converting an array of objects into an array of JSON strings. In this article, we will discuss how to convert an array of objects into a JSON string array using JavaScript.

There is a built-in JSON object in JavaScript. We can use the stringify() method of the JSON object to convert the object into a string. However, when we want to convert an array of objects, we need some extra steps.

First, let’s take a look at the following sample object array:

var objectsList = [
    { name: "John", age: 25, city: "New York" },
    { name: "Jane", age: 30, city: "Chicago" },
    { name: "Mike", age: 35, city: "Los Angeles" }
];

Now, assuming we want to convert this object array into a JSON string array, we can take the following steps:

var jsonStringArray = objectsList.map(function(obj) {
    return JSON.stringify(obj);
});

In this example, we use JavaScript’s map() method to traverse the object array. During the iteration, we call the JSON.stringify() method on each object and store its return value in a newly created JSON string array.

Now, we have successfully converted the object array into a JSON string array. The following is the output of the jsonStringArray we get:

[ 
    '{"name":"John","age":25,"city":"New York"}', 
    '{"name":"Jane","age":30,"city":"Chicago"}', 
    '{"name":"Mike","age":35,"city":"Los Angeles"}' 
]

Since we use the JSON.stringify() method in each object, each element we get is a JSON-formatted string. You can notice that each string is enclosed in double quotes and separated by commas, which is standard for JSON array format.

Now, if we want to convert the JSON string array back to an object array, we can use the JSON.parse() method. Here is a complete example:

var jsonStringArray = [
    '{"name":"John","age":25,"city":"New York"}', 
    '{"name":"Jane","age":30,"city":"Chicago"}', 
    '{"name":"Mike","age":35,"city":"Los Angeles"}'
];

var objectsList = jsonStringArray.map(function(jsonStr) {
    return JSON.parse(jsonStr);
});

In this example, we define a JSON string array. We then iterate through the array using the map() method and call the JSON.parse() method on each element. We pass the JSON formatted string of the element in this method in order to convert it into an object. Finally, we store the newly created array of objects in the objectsList variable.

Now, when we output the objectsList array using the console.log() method, we should get the following output:

[
    Object { name: "John", age: 25, city: "New York" },
    Object { name: "Jane", age: 30, city: "Chicago" },
    Object { name: "Mike", age: 35, city: "Los Angeles" }
]

In this article, we have learned how to convert the objects array into a JSON string array. We use the map() method to iterate through the array of objects and call the JSON.stringify() method on each object. In this way, we can get a JSON string array that can be stored and transmitted for subsequent processing. We also learned how to use the JSON.parse() method to convert a JSON string array back to an object array if needed.

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