Javascript - convert an EXTRA LARGE Number to string in JSON before the default parsing

json parse big number
get value from json object in javascript
json.parse array of objects
json-bigint
json to object
javascript long integer
javascript int64

As I mentioned in THIS QUESTION, I have problem when getting the response from the server.

I receive an array of objects with these attributes:

[{
"Id": 143187001116603,   // VERY big number which I want to convert it to string
"Name": "تملی612",   // string
"Title": "تسهیلات مسکن بانک ملی-اسفند96",   // string
"InsCode": "IRO6MELZ96C1"   // string
},
...
]

Any simple way to convert a specified type (Number) to string in a JSON file?

I see the replacer argument in JSON.stringify() but I have no idea how to use that...

UPDATE

One of those Ids, is: 9481703061634967 but JS convert that to 9481703061634968!

UPDATE

As Jonas H said in this answer, JS run the default parsing and that's why i lose my real Id value!

Any idea?

Transform the response to string, then apply a repalce with a regex to convert Id field to string type:

const axios = require("axios");
axios.get(url, {transformResponse: [data => data]}).then((response) => {
    let parsed = JSON.parse(response.data.replace(/"Id":(\d+),/g, '"Id":"$1",'))
    console.log(parsed)
});

The parseInt() function parses a string argument and returns an Be careful—​this does not default to 10 ! (For example, a radix of 10 converts from a decimal number, unexpected results when used on very large or very small numbers. "x" · ReferenceError: can't access lexical declaration`X' before  javascript. Score 24. Posts 39. 4 Javascript - convert an EXTRA LARGE Number to string in JSON before the default parsing Oct 27 '18.

Assuming that you receive the data as a Json string with the numbers inside them, there is no way to preserve the data using JSON.parse. Even if you use the second argument to add a transformation function, it will only be run after the default parsing has parsed the numbers with a loss of information in case of large numbers. You need to manipulate the string directly to wrap the number in quotes using e.g. a regular expression.

You can also use the json-bigint npm package: https://www.npmjs.com/package/json-bigint

The JSON.stringify() method converts a JavaScript object or value to a JSON string, or an array of String and Number objects that serve as a whitelist for JSON.stringify([NaN, null, Infinity]); // '[null,null,null]' JSON.stringify({ x: 5 }); Before this change JSON.stringify would output lone surrogates if the input  JavaScript Object Notation. JSON is a syntax for serializing objects, arrays, numbers, strings, booleans, and null. It is based upon JavaScript syntax but is distinct from it: some JavaScript is not JSON, and some JSON is not JavaScript. See also JSON: The JavaScript subset that isn't.

you can use replacer in JSON.stringify() like :

var obj  = {
"Id": 143187001116603,   // VERY big number which I want to convert it to string
"Name": "تملی612",   // string
"Title": "تسهیلات مسکن بانک ملی-اسفند96",   // string
"InsCode": "IRO6MELZ96C1"   // string
};


function replacer(name, val) {
    // convert Number to string
    if ( val && val.constructor === Number ) {
        return val.toString();
    } else {
        return val; // return as is
    }
};

 JSON.stringify(obj, replacer, 4);

// result

{
    "Id": "143187001116603",
    "Name": "تملی612",
    "Title": "تسهیلات مسکن بانک ملی-اسفند96",
    "InsCode": "IRO6MELZ96C1"
}

JavaScript has the equivalent of double (64-bit floating point) for its numbers, and This problem only occurs with very large numbers. throws exceptions in the specific cases where our default behavior is wrong. Use JSON.parse to deserialize the response text (a JSON string) into a JavaScript object. @param {function(key: string, value: *) | Array.<string | number>} [replacer] A function that alters the behavior of the stringification process, or an array of String and Number objects that serve as a whitelist for selecting the properties of the value object to be included in the JSON string. If this value is null or not provided, all

function replacer(key, value) {
  // Filtering out properties
  if (key === 'Id') {
    return value.toString();
  }
  return value;
}

const t = [{
    "Id": 143187001116603, // VERY big number which I want to convert it to string
    "Name": "تملی612", // string
    "Title": "تسهیلات مسکن بانک ملی-اسفند96", // string
    "InsCode": "IRO6MELZ96C1" // string
  },
  {
    "Id": 9481703061634967, // VERY big number which I want to convert it to string
    "Name": "تملی232", // string
    "Title": "تسهیلات مسکن بانک ملی-اسفن216", // string
    "InsCode": "IRO6MSDZ96C1" // string
  }
]
const stringifiedValue = JSON.stringify(t, replacer)
console.log(JSON.parse(stringifiedValue))

JavaScript doesn't have a date literal, and for this reason JSON serializes But yet there's at least one very annoying problem with JSON: It doesn't serialize dates. You can represent strings, numbers, Booleans and even objects, extend the JSON parser to automatically convert the ISO string dates into  The purpose of this article is to help JavaScript number conversion to and from strings thus allowing the UI to respect the .NET CultureInfo.NumberFormatInfo selected by the user. Background Ever since I started working in web development, I have had to deal with a normally bilingual community.

The parseInt() function parses a string and returns an integer. The radix Note: If the first character cannot be converted to a number, parseInt() returns NaN. The next lowest floating point number is 262- 512, the next highest is 262+ 1024, and 4611686018427388000is closer to 262than either of those two nearby numbers.) See also: ES6 specification for ToString(Number) x.toFixed()and the base two string give us more confidence that we have the correct number.

Try it yourself ». Extra large or extra small numbers can be written with scientific (​exponent) notation: JavaScript will try to convert strings to numbers in all numeric operations: This will work: var x Infinity) { // Execute until Infinity myNumber By default, JavaScript displays numbers as base 10 decimals. But you can use  Parsing Large JSON Files using Jackson Streaming API Example In last couple of JSON tutorials for Java programmers, we have learned how to parse JSON using JSON-Simple library, parsing JSON array to Java array using GSon, and in this tutorial we will learn how to parse a large JSON file in Java using Jackson's Streaming API.

Large integers, like 9999999999999999999999999 are valid in Very large numbers should be serialized to JSON as strings and Converting a number to string BEFORE the JSON is parsed would solve this problem. Javascript - How to parse a string and create JSON object « Previous; Next » JSON Object. The JSON object has two methods: stringify() and parse(). stringify() methods serialize JavaScript objects into a JSON string. parse() parses JSON into a native JavaScript value <!

Comments
  • JSON.parse(response) ?
  • Thanks for info - Would you please provide some code? any way to do this before the default parsing?
  • Try the link I just added, that's probably better than rolling your own.
  • Thanks - Can I use this with Axios? or I have to use fetch() and save the response in JSONbig?
  • I'm unsure whether axios interceptors or responseTransform can be used before the automatic Json parse step, but you might want to try them out.
  • It's working! the transformResponse run before automatic JSON parse!
  • The value of Id is changed before... See the update please
  • @MohamadKh75 this is because of number limit in JavaScript.
  • I know and that's why i'm asking for a way to convert it to a string
  • JavaScript numbers are Double Precision Floats; the largest integer that can be precisely stored is 2^53 (9007199254740992). If you actually need it in a number you have some fun math ahead of you, or you can use a library such as big.js
  • I really don't need that in Number format! i just want to save that as string before default parsing round it!