json-shrinker

A lightweight library to minify JSON by removing whitespace and using scientific notation for numbers. Now fully written in TypeScript with optional lossy compression features.

Features

• Whitespace Removal: { "foo" : "bar" } => {"foo":"bar"}
• Scientific Notation: {"foo": 10000000000} => {"foo":1e10}
• TypeScript Support: Fully typed.
• Configurable: Options for lossy compression (removing undefined/null, precision).
• Zero Dependencies: Lightweight.

Installation

npm install json-shrinker

Usage

TypeScript / ES Modules

import { shrinkJSON, stringify, ShrinkOptions } from 'json-shrinker';

// Shrink a JSON string
const bigJSONString = '{ "foo" : 10000 }';
const smallerJSON = shrinkJSON(bigJSONString);
console.log(smallerJSON); // {"foo":1e4}

// Stringify an object
const obj = { a: "hi", b: 10000000000, c: 0.00001 };
const smallJSON = stringify(obj);
console.log(smallJSON); // {"a":"hi","b":1e10,"c":1e-5}

CommonJS

const { shrinkJSON, stringify } = require("json-shrinker");

// ... same usage

Configuration Options

You can pass an optional options object to stringify, shrinkJSON, etc.

interface ShrinkOptions {
  removeUndefined?: boolean; // Default: false
  removeNull?: boolean;      // Default: false
  precision?: number;        // Default: undefined (no rounding)
}

removeUndefined (Lossy)

If true, properties with undefined values in objects will be omitted (mimics standard JSON.stringify behavior). Default is false (lossless), which converts them to null to preserve the key.

stringify({ a: undefined }); // '{"a":null}'
stringify({ a: undefined }, { removeUndefined: true }); // '{}'

removeNull (Lossy)

If true, properties with null values in objects will be omitted.

stringify({ a: null }); // '{"a":null}'
stringify({ a: null }, { removeNull: true }); // '{}'

precision (Lossy)

Limits the number of decimal places for numbers.

stringify({ a: 1.23456789 }); // '{"a":1.23456789}'
stringify({ a: 1.23456789 }, { precision: 2 }); // '{"a":1.23}'

API

stringify(value: any, options?: ShrinkOptions): string

Stringifies a JavaScript value, applying shrinking techniques.

shrinkJSON(jsonString: string, options?: ShrinkOptions): string

Parses a JSON string and re-stringifies it with shrinking.

License

MIT