How do I convert CSV to JSON?

Paste CSV or drop a .csv file, choose options (delimiter, header row, output), then click Convert. Copy or download the JSON output.

Does it support NDJSON (JSON Lines)?

Yes. Choose NDJSON in the Output menu to export one JSON object per line.

Can the tool auto-detect the delimiter and header row?

Yes. Leave delimiter as Auto and set Header to use the first row as keys, or switch to No header to generate col1, col2, etc.

Do you upload or store my data?

No. All parsing and conversion run locally in your browser. Nothing is uploaded.

Is type inference supported?

Yes. You can enable type inference to convert numeric/boolean/null text into real JSON types, or turn it off to keep everything as strings.

Are there size limits?

There is no server limit. Practical limits depend on your browser and device memory. Very large CSV files may be slow or fail if they exceed available memory.

CSV to JSON Converter

Paste or upload CSV. Auto-detect delimiter, choose header row, infer types, pretty-print, and export JSON or NDJSON — all locally in your browser.

Privacy-first • Local processing

Input CSV

Drag & drop a CSV file here

Choose file

Paste CSV

Options

Delimiter

Header row

Output

Pretty print

Indent

Type inference (numbers, booleans, null) Empty cells as null

Trim whitespace Skip empty lines

Preview (first 50 rows)

No data yet.

JSON

About this converter

This CSV to JSON tool uses Papa Parse for robust parsing (quotes, escapes, multi-line fields). It supports arrays/objects/NDJSON output, auto or custom delimiters, and optional type inference to convert numbers, booleans and nulls. Everything runs locally in your browser — nothing is uploaded.

How do I convert?

Paste CSV or drop a file → set options → Convert → copy or download JSON/NDJSON.

NDJSON supported?

Yes. Choose NDJSON to export one JSON object per line.

Auto-detect delimiter?

Leave delimiter on Auto or pick comma, semicolon, tab, pipe, or a custom character.

Header row handling

Use first row as keys, or disable to generate col1, col2, …

Privacy

Everything runs locally in your browser. Nothing is uploaded or stored.

Large files?

No server limits, but very large CSVs depend on your device memory and may be slow.

Last updated: October 20, 2025

CSV to JSON Converter

Input CSV

Options

Preview (first 50 rows)

JSON

About this converter

Related tools

JSON Formatter & Validator

Word Counter

Regex Tester