Introduction to json-bigint

In modern web development, it’s often necessary to handle JSON data with very large numbers. The json-bigint library provides a solution to this problem by allowing developers to parse and stringify JSON that includes large integers without losing precision. This article covers the introduction to json-bigint, various useful API explanations, code snippets, and an application example demonstrating its usage.

Key Features

• Parse JSON strings with large integers accurately.
• Stringify objects with big integers safely.
• Compatible with the native JSON interface.

Installation

  
  npm install json-bigint
  

API Examples

Parsing JSON Strings

The json-bigint library can parse JSON strings containing large integers accurately.

  
  const JSONbig = require('json-bigint');
  const jsonString = '{"value": 123456789012345678901234567890}';
  const parsedData = JSONbig.parse(jsonString);
  console.log(parsedData.value.toString()); // "123456789012345678901234567890"
  

Stringifying Objects

The json-bigint library also allows you to stringify objects containing large integers without losing precision.

  
  const JSONbig = require('json-bigint');
  const bigInt = require('big-integer');

  const obj = {
    value: bigInt("123456789012345678901234567890")
  };
  const jsonString = JSONbig.stringify(obj);
  console.log(jsonString); // '{"value":"123456789012345678901234567890"}'
  

Handling Large Numbers

You can configure json-bigint to handle large numbers in different ways depending on your requirements.

  
  const JSONbigNative = require('json-bigint')();
  const jsonString = '{"value": 123456789012345678901234567890}';

  // Parse using native BigInt data type
  const parsedDataNative = JSONbigNative.parse(jsonString);
  console.log(parsedDataNative.value); // 123456789012345678901234567890n (BigInt)

  // Parse using strings
  const JSONbigStrict = require('json-bigint')({ "useNativeBigInt": false, "alwaysParseAsBig": true });
  const parsedDataStrict = JSONbigStrict.parse(jsonString);
  console.log(parsedDataStrict.value); // "123456789012345678901234567890"
  

Integrating with Fetch

Use json-bigint with Fetch API to handle large numbers in JSON responses.

  
  fetch('/api/large-numbers')
    .then(response => response.text())
    .then(text => JSONbig.parse(text))
    .then(data => {
      console.log(data.value.toString()); // Correctly parsed large number
    });
  

App Example

Below is a complete example of an application using json-bigint.

  
  const express = require('express');
  const JSONbig = require('json-bigint');
  const app = express();

  app.use(express.json({
    inflate: true,
    limit: '100kb',
    type: 'application/json'
  }));

  app.post('/api/parse', (req, res) => {
    const jsonString = req.body.jsonString;
    const parsedData = JSONbig.parse(jsonString);
    res.send(JSONbig.stringify(parsedData));
  });

  app.listen(3000, () => {
    console.log('Server is running on port 3000');
  });
  

This example shows an Express server handling JSON data containing large numbers using json-bigint.

By following this guide, you’ll be able to handle large integers in your JSON data without any loss of precision. json-bigint is a reliable library that integrates seamlessly with your existing JSON handling code.

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