JSON ↔ CSV Converter

Turn JSON into spreadsheets and spreadsheets into JSON — nested objects flattened, Excel-ready output.

How to use JSON ↔ CSV Converter

Nested objectsNested fields become dot-path columns like address.city.
Excel friendlyOptional UTF-8 BOM so accented characters open correctly in Excel.
Smart typesCSV numbers and booleans become real JSON numbers and booleans.

What JSON shape is supported?

An array of objects (one row each) or a single object. Arrays inside rows are kept as JSON text.

Why do accents look broken in Excel?

Excel assumes a legacy encoding for CSV. Keep “Excel compatible” on so the file includes a UTF-8 marker.

Is my data uploaded?

No. Conversion runs entirely in your browser.

Beautify, minify and validate JSON instantly with syntax highlighting and precise error locations.

Convert text and files to Base64 and back. UTF-8 safe, URL-safe variant and data URL output included.

Paste two versions and instantly see what was added, removed or changed.

Percent-encode text for safe URLs or decode %-sequences back to readable text, with a query-string breakdown.

Compute MD5 and SHA checksums for text or any file — and check a download against its published hash.

Create random v4 or sortable v7 UUIDs in bulk — cryptographically secure and generated in your browser.