Does this CSV to JSON converter support quoted fields with commas?

Yes. The parser follows RFC 4180: fields wrapped in double quotes can contain commas, newlines, and escaped double-quote characters without breaking the conversion.

What happens if rows have fewer columns than the header?

Missing fields are filled with an empty string so every object in the output array has the same keys as the header row.

Is my data sent to a server?

No. All parsing runs entirely in your browser using JavaScript. Nothing is uploaded or transmitted.

Can I convert a CSV file instead of pasting text?

Open the file in any text editor, select all, paste into the input area, and convert. The result is identical to a dedicated file upload.

What encoding does the converter assume?

The textarea accepts UTF-8 text, which is the default encoding for modern CSV exports from Excel, Google Sheets, and most databases.

How large can my CSV be?

There is no enforced size limit. Performance depends on your device; files up to several megabytes convert in well under a second on modern hardware.

Will the output be a JSON array or a JSON object?

Always an array of objects. Each row becomes one object whose keys are the header names and whose values are strings.

Can I use the output directly in a fetch() call?

Yes. Copy the JSON output, then use JSON.parse() in your code or paste it as the body of a POST request in tools like Postman or Insomnia.

Does the tool handle Windows-style (CRLF) line endings?

Yes. The parser splits on both \r\n and \n, so CSV files exported from Windows applications convert correctly.

CSV → JSON JSON → CSV JSON → XML XML → JSON HTML → Markdown Markdown → HTML INI ↔ JSON String Escape JWT Generator Data Transfer Morse Code Image → Base64 Date & Time

CSV → JSON

Convert CSV data to a JSON array of objects. First row is used as headers.

CSV Input

Convert CSV to JSON online: the fastest way to turn tabular data into structured objects

CSV (Comma-Separated Values) is the lingua franca of data exchange: spreadsheets, database exports, and analytics pipelines all speak it. But modern APIs, web apps, and JavaScript code work with JSON. Bridging the gap manually means writing throwaway scripts or wrangling Excel formulas. AlteredIdea's CSV to JSON converter eliminates that friction: paste, convert, copy.

The converter handles every RFC 4180 edge case: quoted fields that contain commas, escaped double-quotes, mixed line endings (CRLF and LF), and rows of unequal length. The first row is always treated as the header, and each subsequent row becomes a JSON object with those headers as keys. The prettified output is ready to drop into code, store in a database, or feed into any API that consumes JSON arrays.

How to convert: step by step

1
Paste your CSV data
Copy your CSV content: including the header row: and paste it into the input area.
2
Check the header row
The first row is used as JSON keys. Make sure your headers are descriptive and unique.
3
Click Convert to JSON
The tool parses every row into an object, handling quoted fields and embedded commas correctly.
4
Review the output
The result is a prettified JSON array. The record count is shown above the output panel.
5
Copy and use
Click Copy to put the JSON on your clipboard, then paste directly into your code or API client.

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Frequently Asked Questions

Does this CSV to JSON converter support quoted fields with commas?: Yes. The parser follows RFC 4180: fields wrapped in double quotes can contain commas, newlines, and escaped double-quote characters without breaking the conversion.
What happens if rows have fewer columns than the header?: Missing fields are filled with an empty string so every object in the output array has the same keys as the header row.
Is my data sent to a server?: No. All parsing runs entirely in your browser using JavaScript. Nothing is uploaded or transmitted.
Can I convert a CSV file instead of pasting text?: Open the file in any text editor, select all, paste into the input area, and convert. The result is identical to a dedicated file upload.
What encoding does the converter assume?: The textarea accepts UTF-8 text, which is the default encoding for modern CSV exports from Excel, Google Sheets, and most databases.
How large can my CSV be?: There is no enforced size limit. Performance depends on your device; files up to several megabytes convert in well under a second on modern hardware.
Will the output be a JSON array or a JSON object?: Always an array of objects. Each row becomes one object whose keys are the header names and whose values are strings.
Can I use the output directly in a fetch() call?: Yes. Copy the JSON output, then use JSON.parse() in your code or paste it as the body of a POST request in tools like Postman or Insomnia.
Does the tool handle Windows-style (CRLF) line endings?: Yes. The parser splits on both \r\n and \n, so CSV files exported from Windows applications convert correctly.

AlteredIdea vs alternatives

vs online converters that send data to servers: AlteredIdea converts entirely in your browser. Sensitive data never leaves your device.

vs writing conversion scripts: Instant results with no coding. Paste, convert, copy.

vs paid tools: Completely free, no account, no file size limits.

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