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Convert JSON Lines to JSON

Paste your JSON Lines and this tool converts it to JSON instantly, right in your browser. JSON Lines (NDJSON) puts one JSON value on each line, which is how logs, streams and data exports are usually written. JSON (JavaScript Object Notation) is the lingua franca of web APIs: compact, strictly typed, and supported everywhere.

The conversion is completely client-side: there's no upload, no queue, and no account. Big files are converted in the background with a Cancel button, the options for the lossy steps are one click away, and your last conversion is remembered.

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JSONJSON LinesJSON LinesCSV

JSON Lines to JSON Converter — frequently asked questions

How do I convert JSON Lines to JSON?
Paste your JSON Lines, or open or drop a file, and the JSON appears instantly. Copy it, download it (named after your file), or open it in another tool. Errors point to the line and column. Everything happens in your browser.
How does JSON Lines map to JSON?
Each non-empty line is one JSON value, and together they make a JSON list; a list written as JSON Lines puts each item on its own line. A line that isn't valid JSON is reported by its line number.
Is my data uploaded to a server?
No. The conversion runs entirely in your browser — your data never leaves your device, so it's safe to convert configuration, API payloads, and other sensitive files. You can even go offline once the page has loaded.
Is this converter really free?
Yes. No sign-up, no payment details, no file-size paywall, and no watermark on the output.

All format converters

JSONYAMLJSONXMLJSONCSVYAMLJSONYAMLXMLYAMLCSVXMLJSONXMLYAMLXMLCSVCSVJSONCSVYAMLCSVXMLJSONJSON LinesJSON LinesCSVCSVJSON LinesJSONTSVTSVJSONCSVTSVTSVCSVJSONTOMLTOMLJSONYAMLTOMLTOMLYAML

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