CSV is how spreadsheets and database exports hand you data. JSON is what your code wants. This page bridges the two: paste a table and convert csv to json in your browser, free, with the header row becoming keys and each line becoming an object. It is csv to json online, with nothing uploaded.
Flat table in, structured data out.
Paste a comma separated table and the tool reads the first row as field names, then turns every following row into a JSON object. It infers types as it goes, so numbers and booleans arrive as numbers and booleans. That is the whole of csv to json: header row to keys, data rows to objects.
Searches land here in a few shapes, including convert csv to json, a csv to json converter online, and convert csv file to json file. They all describe the same job, and it runs as convert csv to json online entirely in your browser. Because it is csv to json online with no upload, even a private export stays on your machine.
The reverse trip.
Sometimes you have JSON and need a spreadsheet. The JSON to CSV tool covers convert json to csv and json to csv online, and it also handles convert json into csv and convert json to csv online. If you were hunting for a json convertor in general, that is the page that flattens JSON back into rows and columns.
Two formats, two jobs.
The quick take on json vs csv: CSV is a flat grid of rows and columns that spreadsheets read natively, while JSON is nested and typed, which code and APIs prefer. CSV is lighter for plain tabular data. JSON carries structure, so it suits anything with nesting or mixed types. Convert in the direction your next tool expects.
Other formats people ask about.
This page outputs JSON, so it is not the tool for convert csv to sql, convert csv to xls, or convert csv to txt. The usual route is to open your CSV in a spreadsheet and export the format you need, or to transform the JSON you get here. If your goal is the opposite and you want to convert to csv file or convert to csv format from JSON, the JSON to CSV tool does that.
Close cousins of CSV.
CSV and TSV differ only by the delimiter. For convert tsv to csv, swap tabs for commas before pasting. For convert text to csv, shape your text into rows and columns first so the parser can read it. If your data sits in Apple Numbers, convert numbers to csv by exporting CSV from Numbers, then paste that here to get JSON.
When you need a diff, not a conversion.
Converting and comparing are different tasks. To compare csv files online, the Text Diff tool lines up two files side by side. Whether you need to compare 2 csv files online or compare two csv files online, paste one file into each side and it marks every line that changed.
Stop reading. Start using.
That is everything worth saying. Open the tool and try it on something real. You will know within a minute whether it belongs in your kit.
If you found this useful, the other Developer guides are written in the same voice. We keep them short, practical, and rooted in real work.
mytoolstudio is designed and built by the team at GAP3, a small studio that ships product, brand, and growth work for early stage companies. We built this site as a free public good. Read more about us at gap3.co.
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Open CSV to JSON