MemorySaver
The default in-memory checkpoint store in LangGraph. It persists complete agent state snapshots using JSON serialization. While straightforward to use, it is prone to storage bloat and is suitable primarily for development and testing scenarios.
Core Facts
Timeline (last 90 days)
The default MemorySaver uses JSON serialization, serializes state field by field without deduplication or incremental compression, and each checkpoint contains the full history, which is the root cause of storage bloat.
MemorySaver is one implementation of the checkpoint saver provided by LangGraph, which saves state in memory and is mainly used during development and testing.
LangGraph officially provides three Checkpointer implementations: MemorySaver (in-memory, for development and testing only), SqliteSaver (SQLite file), and AsyncPostgresSaver (PostgreSQL, recommended for production).
All Facts (3)
LangGraph officially provides three Checkpointer implementations: MemorySaver (in-memory, for development and testing only), SqliteSaver (SQLite file), and AsyncPostgresSaver (PostgreSQL, recommended for production).
65%UnverifiedThe default MemorySaver uses JSON serialization, serializes state field by field without deduplication or incremental compression, and each checkpoint contains the full history, which is the root cause of storage bloat.
50%UnverifiedMemorySaver is one implementation of the checkpoint saver provided by LangGraph, which saves state in memory and is mainly used during development and testing.
50%