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'''DataFixerUpper''', often abbreviated as '''DFU''', is a library developed and used by Mojang for handling world upgrades and version changes in {{el|je}}. It provides utilities for data fixing, such as <code>Function</code>s with more inputs (3, 4... 16), and serialization, such as codecs, used by various elements across the codebase. The library helps developers update and migrate data entries such as ids and the format of how data is stored.<br />
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== Packages ==<br />
com.mojang.serialization — contains codec and helpers for codecs and serialization in general.<br />
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com.mojang.datafixers — contains the utilities used for data fixing. Classes here are mainly used by classes in com.mojang.serialization.<br />
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== Navigation ==<br />
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