To convert a String to an Object in JavaScript, you can “use the JSON.parse()” method. The JSON.parse() method is “used to parse a string and return an object.”
JavaScript JSON.parse()
The JSON.parse() method parses a string and returns an object. The JSON.parse() function takes one required and one optional parameter to perform some operation and returns an object.
Syntax
JSON.parse(string,function);
Parameters
- string:- It is a string that can be valid for any data type.
- function: It is an optional argument. We can pass this to our custom function if we want to perform some operation on our string.
Return value
The return value is based on what we pass in his parameter as a string. It generally returns an Object, but still, it depends on what you give as a string.
Example
const string = '{"name":"paresh","age":34,"professional":"coder"}';
const boolean = '{"isAdmin":true}';
const array = '["mango","banana","apple"]';
console.log(JSON.parse(string));
console.log(JSON.parse(boolean));
console.log(JSON.parse(array));
Output
{ name: 'paresh', age: 34, professional: 'coder' }
{ isAdmin: true }
[ 'mango', 'banana', 'apple' ]
In the above example, we pass a JSON string to the JSON.parse() method, and we get a JavaScript object in return. We also parse our array and a boolean value to its original form.
If you pass an array as a string to the JSON.parse() method, it returns an array. So let’s see how we give a function inside a JSON.parse() method to perform some operations on it.
const string = '{"name":"paresh","age":34,"professional":"coder"}';
console.log(JSON.parse(string, (key, value) => {
return key === "age" ? `${value} year` : value;
}));
Output
{ name: 'paresh', age: '34 year', professional: 'coder' }
Here is an example of a string that is not in JSON format.
const string = 'Krunal is 30 years old and lives in Rajkot.';
try {
const object = JSON.parse(string);
} catch (error) {
console.log(error);
}
Output
SyntaxError: Unexpected token 'K', "Krunal is "... is not valid JSON
Manual convert String to object in JavaScript
const string = "name,paresh,age,34,professional,coder"
const temp = string.split(",");
const obj = {}
let i = 0;
while (i < temp.length) {
obj[temp[i]] = temp[i + 1];
i += 2;
}
console.log(obj)
Output
{ name: 'paresh', age: '34', professional: 'coder' }
In the above example, we have one string. So, firstly we split that string into an array using the string split() function. Then, we iterate that array and store that value in our object.
Conclusion
If you are working on a real-time project, the manual way is inefficient; instead, use the JSON.parse() method to convert your string to an object.
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Krunal Lathiya is a seasoned Computer Science expert with over eight years in the tech industry. He boasts deep knowledge in Data Science and Machine Learning. Versed in Python, JavaScript, PHP, R, and Golang. Skilled in frameworks like Angular and React and platforms such as Node.js. His expertise spans both front-end and back-end development. His proficiency in the Python language stands as a testament to his versatility and commitment to the craft.