JSON to string with example

Posted on by dimple

In this article, I show you how to convert JSON to string in JavaScript and which method you can use to convert JSON objects to string.

 

JSON to String

 

JSON to string

In JavaScript, you can convert a JSON object to a string using the JSON.stringify() method. This method takes the JSON object as an argument and returns a string representation of the object.

For example, suppose you have a JSON object like below –


let jsonObject = {
"name": "John Doe",
"age": 30,
"address": {
"street": "123 Main St",
"city": "New york",
"state": "New york"
},
"country": "US",

};

 

You can convert this JSON object to a string using the JSON.stringify() method like the below –


let jsonString = JSON.stringify(jsonObject);
console.log(jsonString);

Output –

{"name":"John Doe","age":30," 
address":{"street":"123 Main St","city":"New york","state":"New york"},"country":"US"}

 

As you can see, the JSON.stringify() method takes the JSON object and converts it to a string that is a valid JSON representation of the object.

 

You can also use the second and third parameters of JSON.stringify() to customize the output, the second parameter is a replacer function that can be used to filter out values, change the data, or add white space. The third parameter is a number or string to be used as white space that can be used to format the output.

Note – The third parameter is from 0 to 10, to indicate how many space characters to use as white space.


let jsonString = JSON.stringify(jsonObject,null,2);
console.log(jsonString);

And below is the Output –


{

"name": "John Doe",
"age": 30,
"address": {
"street": "123 Main St",
"city": "New York",
"state": "New York"
},
"country": "US"
}

Here the third parameter 2 is used to format the output with 2 spaces of indentation.

Key Point When Converting JSON to string 

So, When you convert a JSON object to a string using the JSON.stringify() method, Below are a few key points to keep in mind-

  • The JSON.stringify() method takes the JSON object as the first argument and returns a string representation of the object.
  • The second parameter is the replacer function, which can be used to filter out or modify values before they are stringified.
  • The third parameter is the number of spaces to use for indentation, which can be used to format the output.
  • The JSON.stringify() method will convert all non-string values to strings, including numbers, Boolean values, and null.
  • The JSON.stringify() method will ignore any properties in an object that have the value undefined or are non-enumerable.

Conclusion

I hope now will be able to effectively convert JSON objects to strings and customize the output using the JSON.stringify() method. This is how JSON to string works using JSON.stringify() method.