JSON to CSV vs Excel (XLSX): Which Should You Use?

Last updated: 6 June 2026

When you convert JSON to a spreadsheet, you usually pick between two targets: CSV (a plain text table) or Excel / XLSX (a real workbook). They look similar in Excel but behave very differently. Here's how to choose - and how this tool fits in.

Quick answer

Use Excel (XLSX) when a human will open the file: multiple sheets, real number/date types, long IDs that must not get mangled, and no "which delimiter / encoding?" guessing. Use CSV when a program or database needs to import the data, or when a tool only accepts CSV. This converter produces .xlsx, which opens cleanly in Excel, Google Sheets, and LibreOffice - and from there you can always Save As CSV if a system needs it.

CSV: simple but lossy

Universally importable; tiny, plain text.
One table only - no multiple sheets.
No data types: long IDs and codes like 007 can lose leading zeros or get converted to scientific notation when reopened.
Delimiter and encoding ambiguity (commas in values, UTF-8 vs ANSI) can break the table.

Excel (XLSX): richer and safer for people

Preserves numbers, dates, and text without delimiter issues.
Supports multiple sheets - handy when your JSON has two or more top-level lists of objects.
Ready to filter, sort, and pivot the moment it opens.
Keeps long numeric IDs intact (this tool is bigint-safe).

How nested JSON is handled either way

CSV and Excel are both flat, so nested JSON has to be flattened. By default this converter spreads nested objects into dotted columns (user.address.city); you can switch to JSON in one cell to keep a subtree as text. Lists of values become a comma-separated cell, and lists of objects are kept as JSON text in a single cell.

Convert your JSON now

Drop or paste your JSON to get a ready-to-open .xlsx in seconds - free, no signup, and processed in your browser. If you specifically need CSV, open the downloaded file in Excel or Google Sheets and use Save As / Download as CSV.

Related guides

See all guides or the FAQ.

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