Is the CSV to JSON Converter secure?

Yes. All CSV and JSON conversions run entirely inside your browser. No files or data are uploaded to any server, making it safe for confidential data.

Does this tool support JSON to CSV conversion?

Yes. It converts JSON to CSV with flattening support, sorting keys, including empty fields, and more.

Can I convert large CSV files?

Yes. The tool supports large CSV files. Processing happens locally, so speed depends on your device's performance.

Does the converter auto-detect delimiters?

Yes. It automatically detects comma, semicolon, tab, and pipe delimiters. You can also manually select one.

Can I export or download the results?

Yes. You can export the converted output to JSON or CSV files with a single click.

What is a CSV to JSON converter?

A CSV to JSON converter transforms CSV (comma-separated values) into JSON (JavaScript Object Notation). It's useful for APIs, storage, and programmatic data handling.

Is this converter free to use?

Yes — the tool is completely free and requires no signup.

Is my data private and secure?

Yes. All conversion and file parsing occurs locally in your browser. No data is uploaded to any server.

Can I convert large CSV or JSON files?

Yes. The tool handles large files in-browser; performance depends on your device's memory and CPU.

Does the converter detect delimiters automatically?

Yes. It detects common delimiters (comma, semicolon, tab, pipe). You can also manually set the delimiter.

Does the tool support JSON → CSV conversion?

Yes — it can convert JSON (arrays or objects) to CSV and flatten nested structures using a configurable separator.

Can I preview the data before exporting?

Yes. After conversion, use the built-in table preview that supports search, filter, and pagination.

What export formats are supported?

You can export the results as .json or .csv, or copy to clipboard.

How do I share a conversion?

Use the 'Copy share link' feature to generate a URL containing encoded input that others can open to reproduce the conversion.

Free Online CSV ⇄ JSON Converter — Fast, Accurate & Secure

Convert CSV to JSON and JSON to CSV instantly with our advanced, privacy-friendly converter. The tool auto-detects delimiters, previews data in a table, flattens nested JSON, supports large files, and runs 100% in your browser — no uploads, no signups.

Why use this CSV ⇄ JSON Converter?

Instant conversions — CSV → JSON and JSON → CSV in seconds.
Auto delimiter detection — comma, semicolon, tab, or pipe are recognized automatically.
Flexible output formats — array-of-objects, array-of-arrays, keyed-by-column, or flattened JSON for CSV.
Table preview — inspect rows, search, filter and paginate before exporting.
File support & drag & drop — upload CSV/JSON files or paste text directly.
Privacy-first — all processing is client-side; your data never leaves your device.

Key Features

CSV → JSON: header-based objects, arrays, keyed-by column
JSON → CSV: automatic flattening, configurable separator, sort keys, include empty fields
Auto-detect CSV delimiter (`,`, `;`, `|`, `\t`) with manual override
Smart type parsing for numbers, booleans, and nulls
Preview mode: syntax highlighter + paginated table view
History saved locally, shareable links (encoded input), copy & download (CSV/JSON)
Keyboard shortcut: Ctrl/Cmd + Enter to run conversion

How to use the converter

Paste your CSV or JSON into the input box (or upload a file).
Select conversion direction: CSV → JSON or JSON → CSV.
Adjust options (delimiter, flatten separator, include empty fields, etc.).
Click Run (or press Ctrl/Cmd + Enter).
Preview the result, then copy or download as .json or .csv.

Common use cases

Preparing data for APIs or JavaScript apps
Converting CSV exports from Excel / Google Sheets to JSON
Flattening nested JSON for import into spreadsheets or BI tools
Cleaning CSV data and removing empty rows
Sharing sample datasets with colleagues in the required format

Frequently Asked Questions (FAQ)

What is a CSV to JSON converter?: A CSV to JSON converter transforms CSV (comma-separated values) into JSON (JavaScript Object Notation). It's useful for APIs, storage, and programmatic data handling.
Is this converter free to use?: Yes — the tool is completely free and requires no signup.
Is my data private and secure?: Yes. All conversion and file parsing occurs locally in your browser. No data is uploaded to any server.
Can I convert large CSV or JSON files?: Yes. The tool handles large files in-browser; performance depends on your device's memory and CPU.
Does the converter detect delimiters automatically?: Yes. It detects common delimiters (comma, semicolon, tab, pipe). You can also manually set the delimiter.
Does the tool support JSON → CSV conversion?: Yes — it can convert JSON (arrays or objects) to CSV and flatten nested structures using a configurable separator.
Can I preview the data before exporting?: Yes. After conversion, use the built-in table preview that supports search, filter, and pagination.
What export formats are supported?: You can export the results as .json or .csv, or copy to clipboard.
How do I share a conversion?: Use the "Copy share link" feature to generate a URL containing encoded input that others can open to reproduce the conversion.

CSV ⇄ JSON Converter — Advanced

Output

History