CSV to JSON Lines
Convert CSV data to JSON Lines format.
Rows as JSON objects, one per line
JSON Lines is a format where each line is a separate JSON object, popular for data processing and streaming. This converts a CSV into JSON Lines, turning each row into a JSON object on its own line, in your browser.
Load a CSV to convert it to JSON Lines.
Why JSON Lines suits large data
JSON Lines has become a favourite format for data pipelines and large datasets because of a clever practical advantage: since each record is a complete JSON object on its own line, a program can process the data one line at a time without loading the entire file into memory, which is essential for very large datasets that would not fit otherwise. It also means a file can be appended to simply by adding lines, and a single corrupt line does not break the whole file. This makes it ideal for logs, data streams and big data processing, where these properties matter. Converting from CSV, the common tabular format, into JSON Lines bridges spreadsheet-style data into these processing workflows, mapping each row's columns to named fields in a JSON object. Doing it in the browser keeps the data local, so even sensitive records are converted on your own device without being uploaded.
Common questions
What is JSON Lines?
A format where each line is a separate JSON object — one record per line — popular for data processing and streaming.
Why is it good for large datasets?
Programs can process it one line at a time without loading the whole file into memory, it can be appended to easily, and one bad line does not break the file.
Is my data uploaded?
No. The conversion happens in your browser, so the data stays on your device.