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Convert JSON Lines to CSV

Paste your JSON Lines and this tool converts it to CSV 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. CSV is a flat, tabular format that opens directly in Excel, Google Sheets, and database import tools.

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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Related conversions

CSVJSON LinesJSON LinesJSON

JSON Lines to CSV Converter — frequently asked questions

How do I convert JSON Lines to CSV?
Paste your JSON Lines, or open or drop a file, and the CSV 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.
What if my JSON Lines is nested?
Nested objects become dotted columns like address.city, or, if you choose, JSON text in one cell; lists are written as JSON text or numbered columns. Records with different keys still get every column, and cells starting with = + - or @ get an apostrophe so a spreadsheet won't run them as formulas (you can turn that off).
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 LinesJSONCSVJSON LinesJSONTSVTSVJSONCSVTSVTSVCSVJSONTOMLTOMLJSONYAMLTOMLTOMLYAML

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