NBT Validator

NBT Validator analyzes Named Binary Tag data to verify structural correctness and type conformance. It accepts NBT data in text form or as base64-encoded binary, processes it without executing or loading into a game, and returns a detailed validation report. This helps developers, modders, server operators, and tooling authors catch schema mismatches, invalid tag types, and malformed nesting before deployment. The tool operates with a formal, registry-driven approach: it parses input, builds a hierarchical representation, and validates each node against canonical type rules. When a problem is found, it records the exact path, the expected type, and the actual value, enabling rapid pinpointing of faults.
Conceptually, the validator uses a streaming parser to minimize memory usage on large data sets, supports version-aware rules, and can enforce optional schemas that describe allowed tag names, types, and nesting depth. It outputs a machine-friendly report and a human-friendly summary. Optional features include batch validation, incremental checks for large saves, and auto-suggested corrections for common type mismatches. The results are designed for automation in CI pipelines and for interactive debugging by developers working with Minecraft worlds, data packs, or mod configs.
Use cases include validating world saves, configuration blocks, data packs, and migration-ready payloads. Its unique value is the combination of precise path-based errors, optional schema validation, and a design that scales with payload size while remaining deterministic in results. Core features include strict parsing, flexible input formats, structured error reporting, and exportable outputs. The tool does not execute game logic or modify game state; it strictly validates data structures according to defined rules, making it suitable for quality gates and pre-release checks.