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CSV to JSON converter

Convert CSV data to a JSON array of objects. Handles quoted fields, commas inside values, and escaped quotes. Download or copy the result.

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What is CSV to JSON Converter?

A CSV to JSON converter takes comma-separated values data, typically exported from spreadsheets or databases, and transforms it into a structured JSON array of objects ready for use in APIs, applications, and scripts. CSV is the universal export format for Excel, Google Sheets, database dumps, and analytics platforms, but modern web applications and APIs consume JSON. Manually converting rows and columns into nested JSON objects is tedious and error-prone. This tool parses your CSV input using a proper state-machine parser that correctly handles quoted fields containing commas, escaped double quotes, and multi-line values. The first row is automatically treated as column headers, and each subsequent row becomes a JSON object with those headers as keys. You can choose 2-space or 4-space indentation for readable output, then copy or download the result as a .json file. All processing happens in your browser, so your spreadsheet data stays private. Perfect for developers importing CSV data into MongoDB, building API request bodies, or converting legacy data exports into modern JSON format.

How to Use CSV to JSON Converter

  1. 1

    Paste your CSV data

    Copy CSV content from your spreadsheet, database export, or text file and paste it into the input area. The first row should contain column headers that will become JSON keys.

  2. 2

    Choose JSON indentation

    Select 2-space or 4-space indentation for the output. The JSON array is generated instantly as you paste, with each CSV row converted to a JSON object using the header row as property names.

  3. 3

    Download or copy the JSON

    Click Download to save the result as a .json file, or click Copy to place it on your clipboard. The output is valid JSON ready to use in your application or API.

Features

  • Full CSV parser handles quoted fields and embedded commas
  • Escaped double quotes (RFC 4180) parsed correctly
  • First row auto-detected as column headers
  • Adjustable JSON indentation (2 or 4 spaces)
  • Download as .json file or copy to clipboard
  • Private processing — CSV data never leaves your browser

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Frequently Asked Questions

Does the first row need to be headers?+
Yes. The tool treats the first row as column headers and uses them as JSON property names. Each subsequent row becomes a JSON object with those keys. If your CSV has no header row, add one before converting.
How are quoted fields handled?+
The parser correctly handles fields wrapped in double quotes, including fields that contain commas, newlines, or escaped quotes (""). This follows the RFC 4180 CSV standard used by Excel and Google Sheets.
Are numbers converted to JSON numbers?+
Currently all values are output as JSON strings to preserve the exact data from your CSV. If you need numeric types, you can post-process the JSON output to parse specific fields as numbers.
Can I convert tab-separated values (TSV)?+
This tool is designed for comma-separated values. For TSV data, replace tabs with commas first, or use a text editor find-and-replace before pasting. A dedicated TSV converter may be added in the future.
What happens with empty cells in the CSV?+
Empty cells are converted to empty strings in the JSON output. The key still appears in the object with an empty string value, so your JSON structure remains consistent across all rows.
Is there a row or column limit?+
There is no artificial limit. The conversion runs in your browser memory, so files with thousands of rows and dozens of columns process in seconds. Very large files (100K+ rows) may take longer depending on your device.