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JSON to CSV Converter
Paste a JSON array and convert it into CSV rows instantly.
Delimiter
JSON Input
CSV Output
What Is JSON to CSV Conversion?
JSON arrays of objects map naturally to tabular data: each object becomes a row and each key becomes a column header. Converting to CSV lets you open the data in spreadsheet applications like Excel and Google Sheets, pipe it into data pipelines, or import it into databases that accept delimited text files.
Delimiters and Compatibility
While commas are the most common delimiter, some locales and tools expect tabs, semicolons, or pipes. Choose the delimiter that matches your target application. Tab- separated values (TSV) are common in bioinformatics and analytics tooling, while semicolons are the default CSV separator in many European Excel installations.
Flattening Nested Objects
Real-world JSON often contains nested objects. When the Flatten nested objects option is enabled, a key like {"address":{"city":"NYC"}} becomes the column address.city with value NYC. This avoids serializing sub-objects as raw JSON strings and produces a cleaner, more useful spreadsheet.
Privacy and Security
Conversion happens entirely in your browser using the PapaParse library. No data is uploaded to any server, making it safe to convert payloads that contain customer records, financial data, or internal API responses.
FAQs
How are nested JSON objects flattened to CSV?
Nested objects are flattened using dot notation. For example, {"user": {"name": "John"}} becomes a column "user.name" with value "John". The flattening option can be toggled on or off.
How are JSON arrays handled in CSV conversion?
Array values are joined into a single cell. For example, {"tags": ["a","b"]} becomes the cell value "a,b" (or a JSON string). Top-level arrays of objects become rows in the CSV.
Can I change the CSV delimiter?
Yes. Use the delimiter dropdown to choose comma, tab, semicolon, or pipe. Tab-separated values (TSV) are useful when your data contains commas. Semicolons are common in European locales.
Will the CSV output open correctly in Excel?
Yes. The output follows the CSV standard (RFC 4180) with proper quoting of fields that contain commas, quotes, or newlines. Excel should parse it correctly. For best results, use comma as the delimiter.
What happens with inconsistent JSON keys across objects?
The converter creates columns for all unique keys across all objects. Objects missing a key will have an empty cell for that column. The column order is based on the first occurrence of each key.
Is Free JSON to CSV Converter Online — Flatten Nested Objects free to use?
Free JSON to CSV Converter Online — Flatten Nested Objects is completely free and runs in your browser.
Does Free JSON to CSV Converter Online — Flatten Nested Objects send my data to a server?
No. Free JSON to CSV Converter Online — Flatten Nested Objects processes input directly in your browser.
Do I need to create an account to use Free JSON to CSV Converter Online — Flatten Nested Objects?
No account is required to use Free JSON to CSV Converter Online — Flatten Nested Objects.
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