CSV to JSON Converter - Local Real-Time Parser

Convert CSV text or files to JSON arrays locally in your browser. Supports headers, comma/semicolon/tab delimiters, drag-and-drop files, copy, and download with no uploads.

Click for theater mode
You can also drop a CSV file here. It is read locally in your browser.

JSON refreshes automatically after typing, pasting, dropping a file, or changing options; use the button to recalculate now.

Ready

Converted 0 rows and 0 columns

How to Use

  1. Paste CSV text into the left input panel, load the sample order export, or drop a local CSV file into the input area.
  2. Choose comma, semicolon, or tab based on the export source, and decide whether the first row should be treated as headers.
  3. The JSON preview refreshes automatically; use the โ€œConvert to JSONโ€ button when you want an immediate recalculation.
  4. If a quoted field is not closed, the tool shows an error. Files over 5MB show a performance warning.
  5. When the preview looks right, copy the JSON or download a .json file for development, import, or debugging.

Core Features

  • Local CSV to JSON: Convert CSV from Excel, databases, or internal dashboards into JSON arrays you can use in code, without uploading the data.
  • Real-time preview: JSON refreshes after typing, pasting, dropping a file, or changing parsing options; the button recalculates immediately.
  • Header and delimiter controls: Treat the first row as object keys by default, and switch between comma, semicolon, and tab for common export formats.
  • Quoted field parsing: Handle commas, quotes, and line breaks inside quoted CSV fields so you spend less time cleaning data by hand.
  • Copy or download: Review the JSON preview, then copy it or download a .json file.
  • Large-file guidance: Files over 5MB show a warning because real-time conversion can briefly use the browser main thread.

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Calculation Logic

This CSV to JSON converter uses a local parser in your browser:

  • Cells are split by the selected delimiter.
  • Delimiters and line breaks inside quoted fields stay inside the field value.
  • Two consecutive quotes are restored as one quote.
  • When headers are enabled, the first row becomes JSON object keys; empty headers become safe names such as column_1, and duplicate headers receive a suffix.
  • When headers are disabled, the output is a two-dimensional array for raw data without column names.
  • Input changes are briefly debounced before automatic conversion to avoid repeated recalculation while large text is being pasted. Parsing, copying, and downloads stay inside the current browser session.

FAQ

Is my CSV uploaded?

No. File reading, parsing, JSON generation, and download creation all happen locally in your browser. CSV content is not uploaded to EasyTools servers.

Does this work with Excel CSV exports?

Yes. It supports common comma, semicolon, and tab-delimited text. Some regional Excel exports use semicolons, which you can select in the tool.

Does the first row have to be headers?

No. Enable headers to output objects, or disable headers to output a two-dimensional array.

Can it handle commas or line breaks inside fields?

Yes, as long as those fields are wrapped in quotes according to CSV rules. An unclosed quoted field will show an error.

What happens with large CSV files?

Files over 5MB show a performance warning. Conversion still runs locally, but real-time preview may briefly use the browser main thread.

Can I download the JSON file?

Yes. You can copy the result or download it as a .json file.