JSON List to CSV Converter

A JSON List to CSV converter transforms a JSON array of objects into the CSV (Comma-Separated Values) format. For example, [{"name":"Alice","age":30}] becomes a table with "name" and "age" as column headers. This is essential for data analysts, developers, and anyone who needs to import JSON data into spreadsheet applications like Microsoft Excel or Google Sheets.

Absolutely safe. This tool runs entirely in your browser. All parsing, conversion, and CSV generation happens locally on your device. No data is ever sent to any server, stored, or logged. You can use it offline after the page loads — perfect for sensitive or confidential datasets.

We support four common delimiters: Comma (,) — the standard CSV format; Semicolon (;) — widely used in European locales where commas serve as decimal separators; Tab (\\t) — producing TSV files ideal for direct spreadsheet pasting; and Pipe (|) — often used in data pipelines and log processing where commas may appear in field values.

Nested objects and arrays are automatically serialized using JSON.stringify(), so they appear as escaped JSON strings within the CSV cell. While this preserves all data, we recommend flattening deeply nested structures beforehand for optimal readability in spreadsheet software. This tool is designed primarily for flat JSON arrays of objects with simple key-value pairs.

Yes! If you input a flat array like ["apple", "banana", "cherry"] or [1, 2, 3, 4], the converter will create a single-column CSV with the header "value". This makes the tool versatile for both object arrays and primitive arrays.

The converter collects the union of all keys across every object in the array, preserving the order of first appearance. If an object is missing a key, the corresponding CSV cell will simply be empty. This ensures no data is lost even with irregular JSON structures. For example, [{"a":1,"b":2}, {"b":3,"c":4}] produces columns a, b, c.

We follow the RFC 4180 standard for CSV formatting. Fields containing commas, double quotes, or line breaks are automatically wrapped in double quotes. Any existing double quotes within a field are escaped by doubling them (""). This ensures maximum compatibility with all major spreadsheet applications, including Excel, Google Sheets, and LibreOffice Calc.

There's no hard limit, but since processing happens in your browser, performance depends on your device's memory and CPU. For most modern devices, arrays with up to 50,000–100,000 objects convert smoothly. The table preview shows only the first 100 rows to maintain snappy performance, but the full CSV output always contains every row. For extremely large datasets, we recommend splitting them into smaller chunks.

Privacy-first: zero data transmission. Real-time: instant table preview as you type. Flexible: multiple delimiter options, beautify JSON, and handle irregular object keys. Clean UX: no ads, no clutter, no registration — just paste, convert, and go. Mobile-friendly: fully responsive design works seamlessly on phones and tablets.