What is a .JSONL file?
JSONL stores one JSON object per line, handy for streaming and large datasets.
- Did you know
- JSON Lines became popular in the 2010s for log files and data pipelines.
- JSON Lines puts one complete JSON value per line and, unlike a JSON array, uses no commas or brackets between records.
- JSON Lines was once a separate format from NDJSON, but the two communities reconciled them into a single shared convention.
- What Analyser reads
- Identify and read metadata from developer and data files: JWT tokens (header + claims + expiry), WebAssembly, Java class files, NumPy/Safetensors/GGUF model files, source maps, SQL dumps, Visual Studio/.NET projects, Terraform, Protobuf, GraphQL, SARIF, Python bytecode, and Apple property lists (XML + binary). Jupyter notebooks (IPYNB) and HAR captures now open in a full viewer - see Notebooks & data above.
- Depth of analysis
- .JSONL is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .JSONL file
- Drag a .JSONL file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.