JSONL Lens
JSONL Lens is a small, dependency-free command-line tool for validating and inspecting JSON Lines files. It streams input one line at a time, so it is useful for logs, model datasets, exports, and other files that should not be loaded fully into memory.
Features
- Reports malformed JSON with line and column numbers.
- Counts valid records, blank lines, top-level JSON types, and common object fields.
- Emits human-readable text or JSON for automation.
- Streams
.jsonl.gzfiles directly without manual decompression. - Reads a file or standard input.
- Uses only the Python standard library at runtime.
Install
Install the latest published release:
python -m pip install jsonl-lens
For development from a checkout:
git clone https://github.com/BlueArt333/jsonl-lens.git
cd jsonl-lens
python -m pip install -e ".[dev]"
Usage
jsonl-lens events.jsonl
jsonl-lens archived-events.jsonl.gz
jsonl-lens events.jsonl --format json
jsonl-lens events.jsonl --require-field id --require-field timestamp
Get-Content events.jsonl | jsonl-lens
Use repeatable --require-field options to check that every object record contains the
fields your pipeline expects. Non-object records are reported when this validation is enabled.
Exit status is 0 when every nonblank line is valid JSON, 1 when malformed lines are
found, and 2 for file or encoding errors.
Contributing
Issues and focused pull requests are welcome. Run the checks locally with:
python -m pytest
python -m ruff check .
License
MIT
1 maintainer
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