Free Online JSONL Viewer
Open a JSONL or NDJSON file as a table instead of raw text, and query the records that turn out to be valid.
Why JSON Lines needs its own viewer
JSON Lines, also called NDJSON, is one JSON object per line, which is what makes it streamable and also what makes a single bad line break a whole-file parse. So validation is per line: you get the count of valid data lines and which ones failed, then the column types inferred across the whole file, nested objects included, and keys a JSON viewer usually mangles, like ones with dots or spaces in them.
The engine runs in your browser
DuckDB is compiled into this page, so the file is read straight from your disk and there is nothing for a server to do. Queries are read-only, which means the file you opened is the file you still have, and closing the tab leaves nothing behind.
From one file to a complete data workflow
Open JSON Lines locally, then move on to compressed files, S3, databases, and repeatable conversion workflows with DBConvert Streams.
Need help with a file? Contact us