A set of efficient utilities that extend the use of JSON (streaming, estimate size, NDJSON/JSONL, etc.)

Generate LLM-friendly llms.txt files from markdown and MDX content files

JSON Schema validation and specifications

Support for proto3 JSON serialiazation/deserialization for protobuf.js

JSON Schema TypeScript definitions with complete inline documentation.

Read and parse a JSON file

Get an unused filename by appending a number if it exists: `file.txt` → `file (1).txt`

Find the first file matching a given pattern in the current directory or the nearest ancestor directory.

a streaming interface for archive generation

Parse and stringify JSON with comments. It will retain comments even after saved!

Convert globs to regular expressions

JSON.parse with bigints support

A lightweight robots.txt parser for Node.js with support for wildcards, caching and promises.

JS library that allows you to easily serialize and deserialize data with BigInt values

JSON parse with prototype poisoning protection

A tiny (2.8kB) and fast utility for getting a MIME type from an extension or filename

Parse, Resolve, and Dereference JSON Schema $ref pointers

A super light and fast circular JSON parser.

A comprehensive library for mime-type mapping

High-performance JSON Pointer implementation