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CSV to JSON Converter

Paste CSV data below to convert it into clean, structured JSON you can copy or download, free and processed entirely in your browser.

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A lot of everyday data work comes down to moving between a spreadsheet-shaped format and a structured one an app can read. This tool parses CSV text, including fields with embedded commas and quotes, and turns it into clean JSON.

Why CSV parsing trips people up

CSV looks simple until a field contains a comma, a line break or a quote mark of its own. The standard fix is wrapping that field in double quotes and doubling any internal quote, like "Doe, John" or "5'6"" tall" written as 5'6"""" tall. A naive split on commas breaks the moment real-world data shows up.

This converter reads the text character by character and correctly tracks when it's inside a quoted field, so a comma inside quotes doesn't create an extra column.

Header row or not

Most CSV exports include a header row naming each column, and the checkbox above is on by default to match that. Each output object then uses your actual column names as keys, which is what most APIs and scripts expect.

If your data has no header row, uncheck the box and the tool will label columns col1, col2 and so on, so you still get valid, usable JSON.

What to do with the result

Copy the JSON directly into your code, a config file, or an API request body. For larger exports, use the download button to save it as a .json file instead of copying a long block of text by hand.

Going the other direction? Use the JSON to CSV Converter to turn an array of objects back into a spreadsheet-friendly file.

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FAQ

CSV to JSON Converter: questions, answered

Does this handle commas inside quoted fields correctly?
Yes. The parser tracks quoted sections character by character, so a comma or line break inside a quoted field is treated as part of that field's content, not a column separator.
What if my CSV doesn't have a header row?
Uncheck "First row is a header row" and the tool will generate generic keys like col1, col2, col3 for each column instead of using your data as field names.
Is there a file size limit?
There's no hard limit built in, but very large files, in the tens of thousands of rows, may feel sluggish since everything runs in your browser tab rather than on a server.
Does my data get uploaded anywhere?
No. Parsing happens entirely in your browser using JavaScript. Nothing you paste is sent to a server, which also makes this safe for sensitive internal data.
Can I convert the JSON back to CSV later?
Yes, use the companion JSON to CSV Converter tool, which takes an array of objects and produces a properly escaped CSV file.

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