RuedigerMoeller/fast-serialization

Health v2 · maintenance only

Adoption not part of the score

1595 stars · 236 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

FST is a fast, JDK-serialization-compatible drop-in replacement for Java object serialization, also offering JSON encoding of serializable object graphs and off-heap/persistent maps. It includes FSTStructs for packed-object-style memory layouts and the MinBin cross-platform binary format.

Use cases

• speed up java serialization of object graphs
• replace jdk serialization with a faster drop-in
• serialize objects to including shared references
• store large maps off the jvm heap
• persist off-heap maps to disk
• serialize lambdas and complex graphs on android

When to choose

• you need faster binary serialization compatible with java.io.Serializable
• you want off-heap data structures to reduce GC pressure
• you need JSON output of full object graphs with reference handling

When to avoid

• you need a modern actively developed serialization library
• you cannot use incubator foreign memory APIs on java 14+ for the 3.x line
• you need cross-language schema evolution like protobuf or avro

Facets

library · maturity maintenance

serialization caching developer-tools performance databases jvm java-serialization offheap drop-in-replacement binary-format minbin android

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