JSONL Inspector
Inspect JSONL (NDJSON) files line by line without uploading them to a converter. DataEngUtils validates each line, flags the ones that fail to parse, and summarises the file so you can find a single bad record in a log stream or event export. Data engineers use it when a JSONL dump fails to load, when you need a quick count and shape of events, or when a producer emits one malformed line among millions. It is free, needs no account, runs entirely in your browser, and works offline once you install the app.
Open it in the app
JSONL Inspector runs in the DataEngUtils browser app on a Rust engine (Apache Arrow) compiled to WebAssembly — free to use, entirely client-side, and nothing is uploaded.
How it works
1. Open JSONL Inspector
Open the tool in the DataEngUtils app — free, no account, nothing uploaded.
2. Paste or drop a JSONL file
Add newline-delimited JSON. Each line is parsed independently.
3. Review validity and summary
See which lines are valid, what failed, and a summary of the records.
Why not use an online tool?
Online inspectors tools require uploading your pipeline inputs to a third-party server. For production work, that is a security and compliance risk. DataEngUtils runs a client-side engine in your browser — same convenience, none of the exposure.