parse-part-json

This is a library that can parse incomplete JSON

Installation

$ npm i parse-part-json

Demo

ESModule:

import { parsePartJson } from 'parse-part-json'

Commonjs:

const { parsePartJson } = require('parse-part-json')

Example:

/**
 * note: This is not a complete JSON
 */
const json1 = `{"name": "John", "age": 30`

const result1 = parsePartJson(json1)
console.log(result1) // { name: 'John', age: 30 }

/**
 * Default tolerance for incomplete parsing of basic types
 */
const json2 = `{"name": "John", "age":nu`
const result2 = parsePartJson(json2)
console.log(result2) // { name: 'John', age: null }

// this throw BasicParseIncomplete Error
const result3 = parsePartJson(json2, { tolerateBasicIncomplete: false })

Preview

https://parse-part-json-demo.vercel.app/

Speed compare

The functionality of the partial-json library is the same as that of the parse-part-json library. Based on my terminal testing and comparison, their JSON parsing speeds vary depending on the data type, but in most cases, parse-part-json is 20–30% faster than partial-json.

import { parse } from 'partial-json'
import { parsePartJson } from 'parse-part-json'

const json1 = `{
  "appName": "WeatherTracker",
  "version": "1.2.0",
  "features": ["forecast", "alerts", "maps"],
  "settings": {
    "units": "metric",
    "language": "en",
    "notifications": true
  },
  "sampleData": {
    "cities": [
      {
        "id": 1001,
        "name": "Springfield",
        "temperature": 22.5,
        "conditions": "partly cloudy"
      },
      {
        "id": 1002,
        "name": "Shelbyville",
        "temperature": 19.8,
        "conditions": "sunny"
      }
    ],
    "updateTimestamp": "2023-05-16T14:30:00Z"
  },
  "metadata": {
    "developer": "Acme Apps",
    "releaseYear": 2023,
    "supportedOS": ["Android", "iOS", "`

// tset result:true
console.log(
  JSON.stringify(parse(json1)) === JSON.stringify(parsePartJson(json1))
)

//test speed
let start = Date.now()
for (let i = 0; i < 100000; i++) {
  parse(json1)
}
let end = Date.now()
// parse: 6023ms
console.log(`parse: ${end - start}ms`)

let start2 = Date.now()
for (let i = 0; i < 100000; i++) {
  parsePartJson(json1)
}
let end2 = Date.now()
// parsePartJson: 1259ms
console.log(`parsePartJson: ${end2 - start2}ms`)

The time consumed for parsing 100000 times in the same JSON segment (note: the results may vary depending on the device)：

parse-part-json : 1259ms

partial-json : 6023ms

Support

ESModule、Commonjs