Purpose: mc-nbt is a Node.js library for reading, writing, and manipulating Minecraft NBT, DAT, and MCA files.
File formats: It supports NBT, DAT, MCA, SNBT, and JSON files.
Conversion: It converts between NBT, SNBT, and JSON, with type preservation described in the README.
Region files: It can read, write, and manipulate individual chunks in Minecraft region files, and process multiple MCA files concurrently.
Inventory tools: Its InventoryManager can list, add, remove, and modify player inventory items.
Integrations: Buffer operations support user-provided adapters, with SFTP and APIs shown as example data sources.
Validation: The library includes NBT structure validation and inspection methods.
Performance features: Async methods, lazy loading, and configurable concurrency are provided for MCA operations.
Requirements: The README requires Node.js 12.0.0 or higher and says the library uses only built-in Node.js modules.
License: The repository README identifies the license as MIT.
Intended users: The README highlights production Minecraft servers, world conversion tools, batch processing scripts, and memory-constrained environments as use cases for async methods.
Formats: It supports NBT, gzip-compressed DAT, MCA region, SNBT, and JSON files.
NBT tags: It reads and writes Byte, Short, Int, Long, Float, Double, String, byte array, int array, long array, List, and Compound tags.
Region tools: Its MCA support includes reading and writing individual chunks, lazy loading, and concurrent bulk processing.
Price from: Free

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Sources

github.com/flaasz/mc-nbt· checked 9 Oct 2026
github.com/flaasz· checked 9 Oct 2026