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Paste CSV and get JSON. Handles headers, delimiters, and spreadsheet exports — all locally.
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Converts CSV data to JSON with automatic delimiter detection (comma, tab, semicolon, pipe). Supports four JSON output formats: array of objects, array of arrays, column-oriented (object of arrays), and pretty-printed. Features configurable quote character handling, drag-and-drop file upload, a preview table showing the first 5 rows, and size comparison between CSV input and JSON output.
CSV is the most common data exchange format from spreadsheets, databases, and analytics tools, but most APIs consume JSON. A reliable, format-flexible converter that handles embedded commas, custom delimiters, and large files saves developers from writing one-off parsing scripts.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Data engineers transforming CSV exports, backend developers ingesting spreadsheet data into APIs, data scientists converting survey results, and anyone migrating from legacy CSV to modern JSON APIs.
Paste CSV text or drag-and-drop a .csv file — delimiter is auto-detected and displayed
Review 'Preview' table showing first 5 rows — verify columns/data types before full conversion
Select JSON output format: 'Array of Objects', 'Array of Arrays', 'Column-Oriented', or 'Pretty-Printed'
Configure options: quote character (double/single), header row (first row as keys or key0,key1...), encoding
Click 'Convert' — JSON output appears with size comparison (CSV vs JSON byte count)
Copy JSON or download as .json — use streaming mode for large datasets to avoid memory limits
Input CSV: 'name,age,city\nAlice,30,NYC\nBob,25,LA' | Array of Objects => '[{"name":"Alice","age":"30","city":"NYC"},{"name":"Bob","age":"25","city":"LA"}]'Input: 'product\tprice\tstock\nWidget\t9.99\t42' | Tab delimiter | Column-Oriented => '{"product":["Widget"],"price":["9.99"],"stock":["42"]}'Input CSV with quoted commas: 'name,note\nAlice,"likes cats, dogs"' => '[{"name":"Alice","note":"likes cats, dogs"}]'Input without headers: '1,apple\n2,banana' with headers off => '[{"key0":"1","key1":"apple"},{"key0":"2","key1":"banana"}]'Can this handle commas inside quoted fields?
Yes, correctly handles commas, newlines, and escaped quotes within quoted fields.
Does it convert data types?
No, all values remain as strings. Use JSON.parse() after conversion.
Maximum file size?
~200 MB browser-based. For larger files, use command-line tool or split CSV.
Can I use custom column names?
Yes, disable 'First Row as Headers' to get key0, key1, key2... names.
Authoritative specifications, standards, and in-depth reading for CSV to JSON Converter.
Convert JSON arrays to CSV for spreadsheets. Paste JSON, pick a delimiter, and download the CSV instantly.
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