Creating a nested JSON file dynamically in Angular: A step-by-step guide

Question

Creating a nested JSON file dynamically in Angular: A step-by-step guide

I am looking to dynamically generate a nested JSON file within an Angular project. The data will be extracted from another JSON file, with two nested loops used to read the information. Below is an example of the initial JSON file structure:

{
"data": [
    [
        {"dat": "hello", "date": 4, "Nr": "11", "stat": "bye"},
        {"dat": "hello", "date": 2, "Nr": "13", "stat": "bye"},
        {"dat": "hello", "date": 4, "Nr": "11", "stat": "bye"},
        {"dat": "hello", "date": 2, "Nr": "13", "stat": "bye"},
    ],
    [
        {"dat": "hello", "date": 4, "Nr": "11", "stat": "bye"},
        {"dat": "hello", "date": 2, "Nr": "13", "stat": "bye"},
        {"dat": "hello", "date": 4, "Nr": "11", "stat": "bye"},
        {"dat": "hello", "date": 2, "Nr": "13", "stat": "bye"},
    ]

My goal now is to extract this data and store it in a JavaScript array or map within the TypeScript file.

javascript json angular loops typescript

Answer 1

Answer №1

When dealing with JSON data, you can easily convert a serialized JSON string into an object that can be used in JavaScript or TypeScript by using the JSON.parse method.

Here is a complete example:

const jsonData = `{
    "information": [
        [
            {"name": "John", "age": 30, "id": "001", "status": "active"},
            {"name": "Jane", "age": 25, "id": "002", "status": "inactive"}
        ],
        [
            {"name": "Alice", "age": 40, "id": "003", "status": "active"},
            {"name": "Bob", "age": 35, "id": "004", "status": "inactive"}
        ]
    ]
}`;

const jsonObject = JSON.parse(jsonData);

for (let group of jsonObject.information) {
    for (let person of group) {
        console.log('Person:', person.name, person.id, person.status);
    }
}

Enhance with an Interface

To improve type information and enable auto-completion for the parsed structure, you can add an interface like this:

interface MyJsonData {
    information: { name: string, age: number, id: string, status: string }[][];
}

const parsedObject: MyJsonData = JSON.parse(jsonData);

Answer 2

When dealing with JSON data, you can easily convert a serialized JSON string into an object that can be used in JavaScript or TypeScript by using the JSON.parse method.

Here is a complete example:

const jsonData = `{
    "information": [
        [
            {"name": "John", "age": 30, "id": "001", "status": "active"},
            {"name": "Jane", "age": 25, "id": "002", "status": "inactive"}
        ],
        [
            {"name": "Alice", "age": 40, "id": "003", "status": "active"},
            {"name": "Bob", "age": 35, "id": "004", "status": "inactive"}
        ]
    ]
}`;

const jsonObject = JSON.parse(jsonData);

for (let group of jsonObject.information) {
    for (let person of group) {
        console.log('Person:', person.name, person.id, person.status);
    }
}

Enhance with an Interface

To improve type information and enable auto-completion for the parsed structure, you can add an interface like this:

interface MyJsonData {
    information: { name: string, age: number, id: string, status: string }[][];
}

const parsedObject: MyJsonData = JSON.parse(jsonData);

Creating a nested JSON file dynamically in Angular: A step-by-step guide

Answer №1

Enhance with an Interface

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