MCA JSON

5.7easy start · #30 of 35
in Minecraft World Editors

Free to practise onnot on record
Free trialnot on record
Well documentednot on record
Runs where you worknot on record

Runs on Linux, Mac, Web, Windows.

MCA JSON is ranked #30 of 35 in Minecraft world editors on The Geeks Club. 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: Yes
Minecraft editions: java
Region editing: Yes
Supported world formats: MCA (Anvil), NBT, SNBT

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The record

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.
Tools: Its command-line tools convert MCA and NBT to JSON, list chunks, find signs, remove chunks, and read player locations.
Library: The TypeScript library provides typed classes and methods for parsing and modifying MCA files, NBT files, and SNBT strings.
Installation: The maker documents global or project installation with npm and says Deno, Bun, pnpm, and other package managers can also be used.
Browser support: The library has no Node-specific tooling requirement and can be bundled for browser environments; it is published as ES modules only.
Minecraft edition: Only Minecraft Java Edition is supported; Bedrock Edition uses a different format.
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.
Compression: The library reads chunks compressed with zlib, gzip, LZ4, or no compression, while modified chunks are saved with zlib.
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.
JSON size: The maker notes that an example mostly untouched region produced about 1 gigabyte of JSON and documents compact and condensed output options.
Runtime: The library works with Node.js 20 and newer.
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.
Price from: Free

Where it ranks on The Geeks Club

Best Minecraft World Editors in 2026#30 of 35

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Sources

github.com/fidian/mca-json· checked 9 Oct 2026