CSV to JSON

About this CSV to JSON converter

Most APIs talk JSON. Most spreadsheets export CSV. This tool bridges the gap — drop a CSV, get back a JSON array of objects (one per row, with the first row as keys). Useful for seeding databases, mocking API responses, importing data into JSON-only systems, or just inspecting what a CSV actually contains in a shape that scripts can read.

Everything runs in your browser using Papa Parse — nothing uploads to a server. Auto-detects the delimiter (comma, semicolon, tab), treats the first row as headers by default, and handles quoted fields with embedded commas correctly. Drop multiple CSVs at once and get back a zip of JSON files. Open Advanced options if you need to override the delimiter or header behaviour.

Common questions

Are my CSV files uploaded?

No. Parsing runs entirely in your browser using Papa Parse. Nothing leaves your device. You can confirm by opening DevTools and watching the Network tab — no requests fire when you drop a file.

What if my CSV uses semicolons or tabs instead of commas?

Auto-detect (the default) reads the first few lines and picks the most consistent delimiter. If you know the format, open Advanced options and pick the delimiter explicitly to skip detection.

How are header rows handled?

By default the first row is treated as JSON keys, so each subsequent row becomes an object like { "name": "Alice", "age": "30" }. If your file has no header row, open Advanced options and uncheck "First row is header" — you'll get arrays of values instead.

Why are all my numbers strings in the output?

CSV has no type system — everything is text. To keep the conversion lossless and predictable, this tool emits every value as a string. If you need numeric types, parse them in your downstream code (JSON.parse won't do it for you because the values are stringified).

Can I convert multiple CSVs at once?

Yes — enable Bulk mode and drop several files. You get back a single zip containing one JSON file per CSV, named to match.