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

Question

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?

Answer 1

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);
});

Answer 2

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