JSON.stringify turns a JavaScript object into JSON text and stores that JSON text in a string, eg:
var my_object = { key_1: "some text", key_2: true, key_3: 5 };
var object_as_string = JSON.stringify(my_object);
// "{"key_1":"some text","key_2":true,"key_3":5}"
typeof(object_as_string);
// "string"
JSON.parse turns a string of JSON text into a JavaScript object, eg:
var object_as_string_as_object = JSON.parse(object_as_string);
// {key_1: "some text", key_2: true, key_3: 5}
typeof(object_as_string_as_object);
// "object"
W3Schools
w3schools.com › js › js_json_stringify.asp
JavaScript JSON.stringify()
The JSON.stringify() method converts a JavaScript value into JSON text.
Top answer 1 of 16
717
JSON.stringify turns a JavaScript object into JSON text and stores that JSON text in a string, eg:
var my_object = { key_1: "some text", key_2: true, key_3: 5 };
var object_as_string = JSON.stringify(my_object);
// "{"key_1":"some text","key_2":true,"key_3":5}"
typeof(object_as_string);
// "string"
JSON.parse turns a string of JSON text into a JavaScript object, eg:
var object_as_string_as_object = JSON.parse(object_as_string);
// {key_1: "some text", key_2: true, key_3: 5}
typeof(object_as_string_as_object);
// "object"
2 of 16
61
JSON.parse() is for "parsing" something that was received as JSON.
JSON.stringify() is to create a JSON string out of an object/array.
JSON.parse(JSON.stringify(x)) Purpose?
While I was working on a project, I came across this snippet of code: var params = JSON.parse(JSON.stringify(defaultParams)); Does this code actually do anything? More on stackoverflow.com
Alternative of JSON.parse(JSON.stringify(data)) as its a synchronous function
Depends. But here, you can try this. https://stackoverflow.com/questions/48295439/json-parse-vs-json More on reddit.com
2
3
March 26, 2024Trying to learn fetch(), JSON.stringify() confusion
You use express.json middleware which tried to parse the body as JSON. hello is not valid JSON. More on reddit.com
14
1
February 12, 2021What is happening when I call JSON and JSON.stringify in the console?
Have you figured out the JSON format? It has a few simple constructs with the same syntax that JS uses: Objects: {} Arrays: [] Numbers: 123 Strings: "123" Booleans: true Null: null Objects have fields which can be any of the above constructs, eg: { "field": "value", "anotherField": 123.456 } Similarly, arrays can contain any of the above constructs as members, eg: [ "Hello", "World", false, null ] The fact that these two constructs can contain any of the other constructs is where the recursion comes in. So an object can contain another object, etc. Eg: [ { "field": "value", "anotherField": 123.456 } "foo", [1, 2, 3] ] Anyway, I'm sure you're aware of how this maps perfectly to how JS objects work. Your job is to take some arbitrary JS object and convert it into JSON like the examples above. The recursion comes from the fact that for every field in an object or element in an array, you must convert that field/element to JSON, too! The base case is when you have an object or array that is empty or one of the leaf types (Number, String, or Boolean). Just note that you'd have to escape the contents of strings to ensure you end up with valid JSON. Normally you'd do this with JSON.stringify, but that's probably a no-go since you're implementing your own version of that function. I believe you should be able to get by with escaping just \ (to \\) and " (to \"). More on reddit.com
6
9
September 17, 201502:32
Quick Guide: JavaScript JSON Parsing & Stringifying in 2 Minutes ...
08:39
DON'T Use JSON.parse & JSON.stringify - YouTube
06:06
JSON.stringify vs JSON.parse Explained Simply - YouTube
14:36
Why do we need JSON.stringify and parse? - YouTube
12:21
Postman Tutorial #34 - JavaScript JSON.stringify() and JSON ...
05:12
Learn JavaScript use JSON parse and Stringify for JavaScript objects ...
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › JSON › stringify
JSON.stringify() - JavaScript - MDN Web Docs
The JSON.stringify() static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.
DigitalOcean
digitalocean.com › community › tutorials › js-json-parse-stringify
How To Use JSON.parse() and JSON.stringify() | DigitalOcean
November 24, 2021 - JSON.stringify() can take two additional arguments. The first one is a replacer function.
Medium
medium.com › @pmzubar › why-json-parse-json-stringify-is-a-bad-practice-to-clone-an-object-in-javascript-b28ac5e36521
Why use JSON “parse” and “stringify” methods a bad practice to clone objects in JavaScript (2023 update) | by Petro Zubar | Medium
October 10, 2023 - As you can see, you can just lose data of unsupported types when copying your object in such a way. Moreover, JavaScript won`t even warn you about that, because calling JSON.stringify() with such data types does not throw any error.
Execute Program
executeprogram.com › courses › modern-javascript › lessons › json-stringify-and-parse
Modern JavaScript: JSON Stringify and Parse
Learn programming languages like TypeScript, Python, JavaScript, SQL, and regular expressions. Interactive with real code examples.
GeeksforGeeks
geeksforgeeks.org › javascript › what-is-difference-between-json-parse-and-json-stringify-methods-in-javascript
What is difference between JSON.parse() and JSON.stringify() Methods in JavaScript ? - GeeksforGeeks
July 23, 2025 - It contrasts JSON.parse(). With replacer parameters, logic on key-value pairs is feasible. Date formats aren't allowed in JSON; thus, they should be included as strings. ... Example: This example we converts the JavaScript object myInfo into a JSON string using JSON.stringify().
Medium
medium.com › @debbie.obrien › json-parse-v-json-stringify-4b9d104c78d0
JSON Parse v JSON Stringify. I always get confused between the JSON… | by Debbie O'Brien | Medium
May 28, 2018 - We can convert a JavaScript object into a string by by using the JSON.stringify().
DEV Community
dev.to › katherineh › jsonstringify-jsonparse-1585
JSON.stringify() & JSON.parse() - DEV Community
November 18, 2024 - JSON.stringify() converts a JavaScript Object or Array to a JSON String, which can be stored as text. JSON.parse() converts a JSON String back into a JavaScript Object or Array.
Built In
builtin.com › software-engineering-perspectives › json-stringify
How to Use JSON.stringify() and JSON.parse() in JavaScript | Built In
Summary: JSON.stringify() converts a JavaScript object into a JSON string, and JSON.parse() reverses the process. These methods are often used together to handle JSON data, but they don’t support certain types like undefined, Infinity, NaN, ...
Attacomsian
attacomsian.com › blog › json-parse-stringify
Understanding JSON.parse() and JSON.stringify()
October 3, 2022 - The JSON.parse() method takes a string as input and transforms it into an object. Similarly, JSON.stringify() takes a JSON object and converts it into a string.
freeCodeCamp
freecodecamp.org › news › json-stringify-example-how-to-parse-a-json-object-with-javascript
JSON Stringify Example – How to Parse a JSON Object with JS
January 5, 2021 - Finally, if you're parsing JSON with Node.js, there's a good chance that you'll need to return JSON at some point, maybe as an API response. Luckily, this works the same way as in the browser – just use JSON.stringify() to convert JavaScript object literals or arrays into a JSON string:
Joe Attardi
joeattardi.dev › customizing-jsonparse-and-jsonstringify
Customizing `JSON.parse` and `JSON.stringify` - Joe Attardi
July 7, 2023 - When we call JSON.stringify our toJSON function is called, and the return value is used for stringification.
CloudSigma
blog.cloudsigma.com › a-tutorial-on-working-with-json-parse-and-json-stringify
A Tutorial on Working with JSON.parse() and JSON.stringify() — CloudSigma
Here, the JSON object is passed, and the return value is a string. This string can be passed to some other remote web service, for example, and then parsed again into a JSON object for manipulation. ... The stringify method can take two arguments: replacerand spacer methods.
Medium
mahabub-r.medium.com › how-json-stringify-and-json-parse-f455dae70619
How JSON.stringify() and JSON.parse() - Mahabubur Rahman
May 22, 2025 - At its core, JSON.stringify() takes a JavaScript value — usually an object or array — and turns it into a JSON-formatted string. But not everything gets serialized.
Top answer 1 of 2
36
It's a way of cloning an object, so that you get a complete copy that is unique but has the same properties as the cloned object.
var defaultParams = { a : 'b' };
var params = JSON.parse(JSON.stringify(defaultParams));
console.log( params.a ); // b
console.log( defaultParams.a ); // b
console.log( params === defaultParams ); // false
The above outputs false because even though both objects have the a property, with the value b, there are different objects that are independent of each other (they don't refer to the same reference).
The JSON method will only work with basic properties - no functions or methods.
2 of 2
1
You can break the connection between two arrays.
For example:
const bulkAssignTreeView = JSON.stringify(this.bulkAssignTreeViewData);
this.bulkAssignTreeViewData = JSON.parse(bulkAssignTreeView);
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › JSON › parse
JSON.parse() - JavaScript - MDN Web Docs
JSON.parse( '{"p": 5}', (key, value) => typeof value === "number" ? value * 2 // return value * 2 for numbers : value, // return everything else unchanged ); // { p: 10 } JSON.parse('{"1": 1, "2": 2, "3": {"4": 4, "5": {"6": 6}}}', (key, value) => { console.log(key); return value; }); // 1 // 2 // 4 // 6 // 5 // 3 // "" In order for a value to properly round-trip (that is, it gets deserialized to the same original object), the serialization process must preserve the type information. For example, you can use the replacer parameter of JSON.stringify() for this purpose:
Medium
medium.com › @akhil-mottammal › demystifying-json-stringify-and-json-parse-2699e4f0048e
Demystifying JSON.stringify() and JSON.parse()
February 22, 2024 - Demystifying JSON.stringify() and JSON.parse() JSON.stringify() is a method in JavaScript that converts a JavaScript object or value into a JSON string. This is useful for serializing data for …
V8
v8.dev › blog › json-stringify
How we made JSON.stringify more than twice as fast · V8
We also added this optimization to JSON.parse, where we can utilize it for fast key comparisons while parsing an array, assuming that objects in the array often have the same hidden classes. Converting numbers to their string representation is a surprisingly complex and performance-critical task. As part of our work on JSON.stringify, we identified an opportunity to significantly speed up this process by upgrading our core DoubleToString algorithm.
Medium
medium.com › @ronaldssebalamu › json-parse-vs-json-stringify-ad2d3218bc44
JSON.parse() vs JSON.stringify()
September 13, 2023 - Conclusion JSON.parse() is used to convert JSON data into a JavaScript object , to make it accessible and modifiable with in the JavaScript code. JSON.stringify() is used to convert a JavaScript object into a JSON formatted string, that is usually ...