CSV to JSON Converter

CSV (Comma-Separated Values) is a tabular data format widely used in spreadsheets. JSON (JavaScript Object Notation) is a lightweight data format used by APIs and web applications. This tool parses CSV rows and columns and converts them into structured JSON — either as an array of objects (using the first row as keys), an array of arrays, or NDJSON (newline-delimited JSON) for streaming use cases.

We support comma (,), semicolon (;), tab, pipe (|), and custom delimiters. The Auto-detect feature analyzes your data and picks the most consistent delimiter automatically — perfect for European CSV (semicolon-separated) or TSV files.

Our parser is RFC 4180-compliant. Fields wrapped in double quotes are treated as a single value — even if they contain commas, line breaks, or other special characters. Double quotes inside quoted fields (escaped as "") are also correctly handled. This is a key advantage over simplistic split(',') approaches used by many other tools.

Array of Objects: Each row becomes an object with keys from the header row — ideal for API consumption.
Array of Arrays: Data as a 2D array — great for programmatic processing.
NDJSON: One JSON object per line — perfect for streaming, log processing, and large datasets that need to be processed line by line.

Absolutely. All parsing and conversion happens entirely in your browser using client-side JavaScript. Your CSV data is never uploaded to any server, transmitted over the network, or stored anywhere. You can safely process confidential spreadsheets, customer data, or proprietary information with complete peace of mind.

The tool handles files up to 50 MB comfortably in most modern browsers. For best performance with files over 100,000 rows, we recommend using Chrome or Edge. The table preview is limited to 50 rows to keep the UI responsive, but the full JSON output is always generated. For extremely large datasets, consider using the NDJSON output format for streaming compatibility.

European locales often use semicolons (;) instead of commas as CSV delimiters (because commas are used as decimal separators). Switch the delimiter to Semicolon or use Auto-detect mode — our tool will recognize the pattern and parse your data correctly.

This tool focuses on CSV-to-JSON conversion. For the reverse direction, we recommend using our companion JSON to CSV Converter (available on the site). Together, they provide a complete round-trip workflow for spreadsheet data transformation.