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Tech riderRev. 9 Oct 2026

MCA JSON

Ch 077.2of 35Minecraft World Editors
  1. 1Runs onLinux, Mac, Web, Windows
  2. 2CostsFree plan
  3. 3Minecraft editionsjava
  4. 4Region editingYes
  5. 5Supported world formatsMCA (Anvil), NBT, SNBT
5 lines stated Written from the maker's own pages: github.com
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The MCA JSON homepage

Overview

MCA JSON is ranked #7 of 35 in Minecraft world editors on Specifiction. It runs on Linux, macOS, Web, Windows. There is a free plan.

MCA JSON plans and pricing

All plans
MCA JSON Free Open-source command-line tools and JavaScript library for MCA/Anvil and NBT files github.com · 9 Oct 2026

Compared on Minecraft world editors

Free plan
Yesgithub.com
Minecraft editions
javagithub.com
Region editing
Yesgithub.com
Supported world formats
MCA (Anvil), NBT, SNBTgithub.com

Facts

Purpose
MCA JSON provides command-line tools and a JavaScript library for converting Minecraft Anvil and NBT files to JSON, converting back, and modifying data.github.com · 9 Oct 2026
Tools
Its command-line tools convert MCA and NBT to JSON, list chunks, find signs, remove chunks, and read player locations.github.com · 9 Oct 2026
Library
The TypeScript library provides typed classes and methods for parsing and modifying MCA files, NBT files, and SNBT strings.github.com · 9 Oct 2026
Installation
The maker documents global or project installation with npm and says Deno, Bun, pnpm, and other package managers can also be used.github.com · 9 Oct 2026
Browser support
The library has no Node-specific tooling requirement and can be bundled for browser environments; it is published as ES modules only.github.com · 9 Oct 2026
Minecraft edition
Only Minecraft Java Edition is supported; Bedrock Edition uses a different format.github.com · 9 Oct 2026
Version coverage
The maker says region structure and NBT reading work across versions and reports trying files from Minecraft 1.2.1 through 1.21.github.com · 9 Oct 2026
Compression
The library reads chunks compressed with zlib, gzip, LZ4, or no compression, while modified chunks are saved with zlib.github.com · 9 Oct 2026
Read limitation
Chunks larger than 1 MiB stored in separate .mcc files and chunks using custom compression cannot be read, though they can still be listed and removed.github.com · 9 Oct 2026
JSON size
The maker notes that an example mostly untouched region produced about 1 gigabyte of JSON and documents compact and condensed output options.github.com · 9 Oct 2026
Runtime
The library works with Node.js 20 and newer.github.com · 9 Oct 2026
Support
For problems with other Minecraft versions, the maker asks users to supply a test MCA file and problem description or submit a pull request.github.com · 9 Oct 2026

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Where it ranks on Specifiction

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Sources