Runs locally in your browser. Nothing you enter is uploaded to our servers.
Tips for JSONL
Each line must be a complete JSON value.
Skip or log blank lines explicitly in pipelines.
One bad line should not silently invalidate the whole file.
Prefer UTF-8 without a BOM for tooling compatibility.
Stream large JSONL files instead of loading everything at once.
One JSON value per line
Processing stays in your browser — your input is not uploaded to our servers.
JSONL (NDJSON) is a stream of JSON values separated by newlines — common in logs and bulk exports. This parser reads line by line instead of expecting one giant array.
A single broken line should not hide the rest: inspect which record failed and keep the valid ones.
Parse JSON Lines
Paste the .jsonl text
Each line should be its own JSON value, not a pretty-printed multi-line object unless that object is still one line.
Scan line errors
Note the first bad line; trailing commas and concatenated objects are typical.
Copy a single record
Pull one object into the JSON formatter if you need to read it nested.
JSONL parser FAQ
Why not wrap everything in [ ]?
Log files can be huge. Line-oriented parse lets you fail one record without loading a single megarray.
Are blank lines allowed?
Usually skipped. A line with spaces only is not a JSON value.
Is this the same as JSON parser?
JSON parser wants one document. JSONL wants many documents stacked as lines.