Does this handle quoted CSV fields with commas?

Yes. It uses a full RFC 4180 parser, so quoted fields containing commas, doubled quotes and even line breaks stay in one cell.

What JSON structure is expected for JSON to CSV?

An array of objects works best; nested objects are flattened with dot notation.

Is my data uploaded anywhere?

No, all parsing and conversion happens locally in your browser.

Can I choose a custom delimiter instead of a comma?

Yes. The delimiter is auto-detected (comma, semicolon, tab or pipe) and you can also pick one yourself.

Does it detect column headers automatically?

The first row is used as the header by default. Untick Header row to treat every row as data with columns named column_1, column_2 and so on. Empty or repeated headers are renamed and you are told.

What happens if rows have a different number of columns?

Short rows are padded with empty values and the status bar warns how many rows had a different number of fields.

Are numbers and booleans converted to their proper JSON types?

Yes, when Detect types is on: 12 becomes a number and true or false become booleans. Values with leading zeros (007) and numbers over 15 digits stay text so nothing is lost. Turn the option off to keep everything as strings.

Processed 100% locally in your browser

CSV to JSON Converter

Convert CSV to JSON and back, with delimiter detection, type detection and a table preview — 100% local.

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Quick Answer

CSV to JSON Converter lets you: Convert CSV to JSON and back, with delimiter detection, type detection and a table preview — 100% local. To start, select CSV → JSON or JSON → CSV.

How to use this tool

1
Choose a direction
Select CSV → JSON or JSON → CSV.
2
Paste your data
Paste CSV rows or a JSON array into the input pane.
3
View the conversion
The converted output updates instantly as you type.
4
Copy the result
Click Copy to copy the converted output to your clipboard.

Format & Performance Scorecard

Feature	CSV	JSON
Structure	Flat, tabular rows	Nested key-value objects
Best for	Spreadsheets, tabular data	APIs, config files, nested data
Readability	Simple, compact	Structured, self-describing
Common use	Excel, databases exports	Web apps, data interchange

Frequently Asked Questions

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CSV to JSON Converter

How to use this tool

Choose a direction

Paste your data

View the conversion

Copy the result

Format & Performance Scorecard

Frequently Asked Questions

Does this handle quoted CSV fields with commas?

What JSON structure is expected for JSON to CSV?

Is my data uploaded anywhere?

Can I choose a custom delimiter instead of a comma?

Does it detect column headers automatically?

What happens if rows have a different number of columns?

Are numbers and booleans converted to their proper JSON types?

Related Tools

JSON Formatter

Regex Tester

CSV to JSON Converter

How to use this tool

Choose a direction

Paste your data

View the conversion

Copy the result

Format & Performance Scorecard

Frequently Asked Questions

Does this handle quoted CSV fields with commas?

What JSON structure is expected for JSON to CSV?

Is my data uploaded anywhere?

Can I choose a custom delimiter instead of a comma?

Does it detect column headers automatically?

What happens if rows have a different number of columns?

Are numbers and booleans converted to their proper JSON types?

Related Tools

JSON Formatter

Regex Tester