json-razor 0.1.2

Reduces JSON, YAML, and NDJSON volume by collapsing repeated structures while preserving the schema.

JSON's Razor — Cut the fat

Reduces JSON, YAML, and NDJSON volume by collapsing repeated structures while preserving the schema.

Large structured data files are hard to parse — not because the structure is complex, but because repetition obscures it. A list of 10,000 objects with identical shape tells you nothing more than a list of 1. JSON's Razor collapses that repetition to its minimum essential form: one representative example of each repeated structure, at every level of nesting.

The output is valid, parseable data in the same format as input — not a summary, not a schema definition. It just has far less volume.

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Install

pip install json-razor

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Usage

cat big.json | json-razor                    # stdin → stdout
json-razor big.json                          # file input → stdout
json-razor big.json -o small.json            # file input → file output
json-razor big.yaml                          # auto-detected as YAML
json-razor app.log --format ndjson           # NDJSON log file

Options

Flag	Default	Description
--keep N	1	Number of examples to keep per repeated structure
--depth N	unlimited	Stop collapsing below this nesting depth
--format	auto	Force format: json, yaml, or ndjson
--truncate N	100	Max string length before truncating

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How it works

Arrays — collapsed to one item. Mixed-type arrays keep one of each distinct type.

// input
[{"id": 1, "name": "alice"}, {"id": 2, "name": "bob"}, {"id": 3, "name": "carol"}]

// output
[{"id": 1, "name": "alice"}]

Mixed types — one representative per JSON type (null, bool, number, string, array, object).

// input
[1, "hello", {"id": 1}, null, true, [1, 2, 3]]

// output
[1, "hello", {"id": 1}, null, true, [1]]

Nested structures — collapsed recursively at every level.

NDJSON — collapsed across lines; one representative line kept.

Nulls and empty values — always preserved (null, [], {}).

Long strings — truncated to a configurable preview.

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Supported formats

Format	Auto-detected from
JSON	.json
YAML	.yaml, .yml
NDJSON	.ndjson