VGSources / Best Minecraft World Editors / MCA JSON

MCA JSON

github.com

Free
Windows
Linux
Web

What it is

MCA JSON provides command-line tools and a JavaScript library for converting Minecraft Anvil and NBT files to JSON, converting back, and modifying data.

From github.com's own pages, read 9 Oct 2026.

Plans

MCA JSONOpen-source command-line tools and JavaScript library for MCA/Anvil and NBT filesFree

As github.com lists them, read 9 Oct 2026.

Data plate

Price: Free to use
Free plan: Yes
Free trial: No
Runs on: Linux, macOS, Web, Windows
Open source: No
Website: github.com
Browser support: The library has no Node-specific tooling requirement and can be bundled for browser environments; it is published as ES modules only.
Compression: The library reads chunks compressed with zlib, gzip, LZ4, or no compression, while modified chunks are saved with zlib.
Installation: The maker documents global or project installation with npm and says Deno, Bun, pnpm, and other package managers can also be used.
JSON size: The maker notes that an example mostly untouched region produced about 1 gigabyte of JSON and documents compact and condensed output options.
Library: The TypeScript library provides typed classes and methods for parsing and modifying MCA files, NBT files, and SNBT strings.
Minecraft edition: Only Minecraft Java Edition is supported; Bedrock Edition uses a different format.
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.
Runtime: The library works with Node.js 20 and newer.
Checked: 9 Oct 2026

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#29Best Minecraft World Editors in 2026of 77

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MCA JSON vs MCBE Inventory Editor

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