Here is my request:

    axios.get(url)
    .then(res => {
        console.log(res.data)
    })

The output is { value: 156144277082605255 }

But should be { value: 156144277082605250 }

How to deal with Big Integers in this case? I tried to use json-bigint But since I am getting response.data from axios as object - it doesn't help.

Here is my request:

    axios.get(url)
    .then(res => {
        console.log(res.data)
    })

The output is { value: 156144277082605255 }

But should be { value: 156144277082605250 }

How to deal with Big Integers in this case? I tried to use json-bigint But since I am getting response.data from axios as object - it doesn't help.

• javascript
• axios
• bigint

3 Answers 3

My colleague answered the question:

I had to transform my response.data into string. (you may wonder - why the useless function - just to redefine default behavior, which parses string into object with JSON.parse - in here we skip this step)

axios.get(url, { transformResponse: [data  => data] });

and then parse with json-bigint

JSONBigInt.parse(res.data);

Adding to the above answers, how to integrate JSONbigint with axios request and response interceptors.

import JSONbigint from 'json-bigint'
...

// request interceptor, preventing the response the default behaviour of parsing the response with JSON.parse
axios.interceptors.request.use((request) => {
  request.transformResponse = [data => data]
  return request
})

// response interceptor parsing the response data with JSONbigint, and returning the response
axios.interceptors.response.use((response) => {
  response.data = JSONbigint.parse(response.data)
  return response
}

Integers that are within the range will remain of type number and those exceeding the range will be of type BigNumber. One could additionally parse BigNumber to string if required by simply calling toString() on the keys of type BigNumber

Run this to install json-bigint: npm install json-bigint --save

Then, use the transformResponse as an option of the axios get request

const jsonBig = require('json-bigint');

let url = 'https://your-api';
axios.get(url, { transformResponse: function(response) {
      return jsonBig().parse(response.data);
}});

You can also use this in the following way:

const jsonBig = require('json-bigint');

axios({
  url: 'https://your-api',
  method: 'get',
  transformResponse: function(response) {
    return jsonBig().parse(response);
  },
})