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flatwire (Python)

Streaming JSON serialization that keeps memory flat and time linear — stream large collections element-by-element instead of materializing the whole payload.

pip install flatwire
import flatwire

# Whole-value convenience (byte-compatible with the standard library).
data = flatwire.encode({"hello": "world"})
value = flatwire.decode(data)

# Stream a large collection to a binary writer, one element at a time.
with open("out.json", "wb") as fp:
    flatwire.encode_array((row for row in huge_iterator), fp)

# Read it back lazily — peak memory is one element, not the whole array.
with open("out.json", "rb") as fp:
    for row in flatwire.decode_array(fp):
        handle(row)

Wire format is plain JSON, so nothing downstream changes. See the monorepo README for the cross-language story and benchmarks.

Apache-2.0.

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