Mojang/DataFixerUpper
Some data may be outdated — see provenance labels.
A set of utilities designed for incremental building, merging and optimization of data transformations. observed · 2026-09-22
Health v2 · maintenance only
55/100
- Activity 72
- Release rhythm 8
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 3036
- days_rel: n/a
- days_push: 168
- n_releases_24m: 0
Adoption not part of the score
1313 stars · 151 forks observed · 2026-09-22
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
DataFixerUpper is a Java library from Mojang for incrementally building, merging, and optimizing data transformations between schema versions. It was created to convert Minecraft: Java Edition game data between game versions.
Use cases
- migrate saved game data between schema versions
- build incremental data transformation pipelines
- upgrade JSON or NBT structures when a schema changes
- compose and optimize chains of rewrite rules on typed data
- define versioned schemas and fixes for evolving data formats
When to choose
- you need to migrate structured data across many successive schema versions
- you want composable, optimizable rewrite rules rather than ad-hoc migration scripts
- you are working in the JVM ecosystem, e.g. modding or tooling for Minecraft
When to avoid
- you only need a one-off simple data conversion
- you are not on the JVM and cannot use a Java library
- you need ETL across external systems rather than in-process data structure upgrades
Facets
library · maturity active
serialization etl developer-tools gaming-tools developer-tools jvm data-migration schema-evolution datafix minecraft version-upgrade data-engineering
1 source
- readme: https://github.com/Mojang/DataFixerUpper · fetched 2026-09-22 · afac8c3cb9c8
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| Mojang/DataFixerUpper | main | 55 |
For agents
markdown · JSON · MCP: product_card(name="Mojang/DataFixerUpper")
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem