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Mojang/DataFixerUpper

A set of utilities designed for incremental building, merging and optimization of data transformations. observed · 2026-08-28

github.com/Mojang/DataFixerUpper · Java · MIT (permissive) observed · 2026-08-28

Health v2 · maintenance only

59/100

  • Activity 80
  • Release rhythm 8
  • Longevity 100
How is this computed?

round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.

  • gap_med: n/a
  • age_days: 2988
  • days_rel: n/a
  • days_push: 120
  • n_releases_24m: 0

Full methodology

Adoption not part of the score

1309 stars · 152 forks observed · 2026-08-28

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

Member repositories

RepositoryRoleHealth v2
Mojang/DataFixerUppermain59

For agents

markdown · JSON · MCP: product_card(name="Mojang/DataFixerUpper")

Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem