Validate a JSON object key

Question

Validate a JSON object key

There are two ways in which we receive JSON strings:

"{"phoneNumber":[{"remove":["0099887769"]},{"add":["0099887765"]}]}"

Or

"{"phoneNumber":["0099887765"]}"

We need to convert the JSON string from the first format to the second format.

Is there a way to write a JavaScript code that can determine which JSON string has the "add" key and which one does not?

javascript arrays json ecmascript-6

Answer 1

Answer №1

After parsing the JSON data, you will receive an array with either two objects for the first style or one string entry. Here is the code snippet to handle this:

function processJSON(data) {
    let parsedData = JSON.parse(data);
    
    if (typeof parsedData.phoneNumber[0] === "object") {
        parsedData.phoneNumber = [parsedData.phoneNumber.find(obj => obj.add).add[0]];
    }
    
    console.log(parsedData);
}

Here is a live example of how to use the function:

function processJSON(data) {
    let parsedData = JSON.parse(data);
    
    if (typeof parsedData.phoneNumber[0] === "object") {
        parsedData.phoneNumber = [parsedData.phoneNumber.find(obj => obj.add).add[0]];
    }
    
    console.log(parsedData);
}
    
processJSON('{"phoneNumber":[{"remove":["0099887769"]},{"add":["0099887765"]}]');

processJSON('{"phoneNumber":["0099887765"]}');

If you require an ES5 version, here it is:

function processJSON(data) {
    var parsedData = JSON.parse(data);
    
    if (typeof parsedData.phoneNumber[0] === "object") {
        parsedData.phoneNumber = [parsedData.phoneNumber.find(function(obj) { return obj.add; }).add[0]];
    }
    
    console.log(parsedData);
}

Answer 2

After parsing the JSON data, you will receive an array with either two objects for the first style or one string entry. Here is the code snippet to handle this:

function processJSON(data) {
    let parsedData = JSON.parse(data);
    
    if (typeof parsedData.phoneNumber[0] === "object") {
        parsedData.phoneNumber = [parsedData.phoneNumber.find(obj => obj.add).add[0]];
    }
    
    console.log(parsedData);
}

Here is a live example of how to use the function:

function processJSON(data) {
    let parsedData = JSON.parse(data);
    
    if (typeof parsedData.phoneNumber[0] === "object") {
        parsedData.phoneNumber = [parsedData.phoneNumber.find(obj => obj.add).add[0]];
    }
    
    console.log(parsedData);
}
    
processJSON('{"phoneNumber":[{"remove":["0099887769"]},{"add":["0099887765"]}]');

processJSON('{"phoneNumber":["0099887765"]}');

If you require an ES5 version, here it is:

function processJSON(data) {
    var parsedData = JSON.parse(data);
    
    if (typeof parsedData.phoneNumber[0] === "object") {
        parsedData.phoneNumber = [parsedData.phoneNumber.find(function(obj) { return obj.add; }).add[0]];
    }
    
    console.log(parsedData);
}

Answer 3

Answer №2

If you're looking to determine whether the property "add" exists in any object within an array, you can utilize the function some. Here is a generic approach:

const json = '{"phoneNumber":[{"remove":["0099887769"]},{"add":["0099887765"]}]}';
const data = JSON.parse(json);

function checkForKey(data, { arrayKey, searchKey }) {
  return data[arrayKey].some(obj => obj[searchKey]);
}

const hasAdd = checkForKey(data, {arrayKey: 'phoneNumber', searchKey: 'add' });
console.log(hasAdd);

Answer 4

If you're looking to determine whether the property "add" exists in any object within an array, you can utilize the function some. Here is a generic approach:

const json = '{"phoneNumber":[{"remove":["0099887769"]},{"add":["0099887765"]}]}';
const data = JSON.parse(json);

function checkForKey(data, { arrayKey, searchKey }) {
  return data[arrayKey].some(obj => obj[searchKey]);
}

const hasAdd = checkForKey(data, {arrayKey: 'phoneNumber', searchKey: 'add' });
console.log(hasAdd);

Answer 5

Answer №3

To achieve this, you can utilize a combination of the for..in loop along with the hasOwnProperty check. Then, make sure to only push the phone numbers that have the 'add' index. I hope this explanation is helpful :)

const result = {'phoneNumber':[]};
let data = '{"phoneNumber":[{"add":["0099844465"],"remove":["0099887769"]},{"add":["0099887765"]}]}'';

const jsonData = JSON.parse(data);
for (var key in jsonData['phoneNumber']) {
        if (jsonData['phoneNumber'][key].hasOwnProperty('add')) {
           result['phoneNumber'].push(jsonData['phoneNumber'][key]['add']);
        }
}

console.log(result);

Answer 6

To achieve this, you can utilize a combination of the for..in loop along with the hasOwnProperty check. Then, make sure to only push the phone numbers that have the 'add' index. I hope this explanation is helpful :)

const result = {'phoneNumber':[]};
let data = '{"phoneNumber":[{"add":["0099844465"],"remove":["0099887769"]},{"add":["0099887765"]}]}'';

const jsonData = JSON.parse(data);
for (var key in jsonData['phoneNumber']) {
        if (jsonData['phoneNumber'][key].hasOwnProperty('add')) {
           result['phoneNumber'].push(jsonData['phoneNumber'][key]['add']);
        }
}

console.log(result);

Answer 7

Answer №4

Start by using the code

let data = JSON.parse('{"contacts":[{"remove":["1234567890"]},{"add":["0987654321"]}]}')

to transform it into an object. Next, loop through the data and extract the values, then add them to a new object.

Answer 8

Start by using the code

let data = JSON.parse('{"contacts":[{"remove":["1234567890"]},{"add":["0987654321"]}]}')

to transform it into an object. Next, loop through the data and extract the values, then add them to a new object.

Answer 9

Answer №5

To determine if 'add' is a top-level property, follow these steps:

if(obj['add']) {....}

If the property exists, the if statement will evaluate to true. If it does not exist, it will return undefined and the if statement will be false.

If you need to check for 'add' in an array of objects, you can apply the same logic using the find method from the array prototype.

phoneNumber.find(obj => obj['add']);

Answer 10

To determine if 'add' is a top-level property, follow these steps:

if(obj['add']) {....}

If the property exists, the if statement will evaluate to true. If it does not exist, it will return undefined and the if statement will be false.

If you need to check for 'add' in an array of objects, you can apply the same logic using the find method from the array prototype.

phoneNumber.find(obj => obj['add']);

Answer 11

Answer №6

To verify the presence of the add key, you can convert the JSON data into an array:

Converting JSON to Array in JavaScript: A Comprehensive Guide

Once converted, you can easily check if the key exists by simply testing for its undefined status:

if (obj["phonenumber"]["add"] !== undefined) {
    // Key is present
} else {
    // Key is not present
}

Answer 12

To verify the presence of the add key, you can convert the JSON data into an array:

Converting JSON to Array in JavaScript: A Comprehensive Guide

Once converted, you can easily check if the key exists by simply testing for its undefined status:

if (obj["phonenumber"]["add"] !== undefined) {
    // Key is present
} else {
    // Key is not present
}

Validate a JSON object key

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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