CSV to JSON

Convert CSV into a JSON array of objects — in your browser, nothing uploaded.

CSV

JSON

Convert numbers & booleans

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About CSV to JSON

This converts a CSV — from a spreadsheet export, a database dump or a report — into a JSON array of objects that code can consume directly. It's the everyday step for feeding spreadsheet data into an app, seeding a database or API, or turning a colleague's CSV into something you can work with programmatically. Paste the CSV and get clean, indented JSON back.

How it works

The CSV is parsed with a proper parser that understands quoted fields — so commas, quotes and line breaks inside a quoted value are handled correctly, and doubled quotes ("") are read as a literal quote. The first row is used as the object keys, and each following row becomes an object mapping those keys to values. Completely empty rows are skipped. With type conversion on, cells that look like numbers become numbers and true/false become booleans; otherwise every value stays a string. The output is pretty-printed JSON.

Assumptions and behaviour

The first row is the header and supplies the JSON keys.
Quoted fields are fully supported: commas, newlines and escaped quotes inside quotes don't break the parse.
Empty rows are dropped, so trailing blank lines don't create empty objects.
Type conversion is optional. With it off, all values are strings — safe for data like ZIP codes or IDs with leading zeros. With it on, clean numeric and boolean values are typed.

Limitations

A header row is required. Without meaningful headers in the first row, the keys will be whatever that row contains.
Duplicate column names collide — two columns with the same header map to the same key, so the later value overwrites the earlier one.
Type conversion is deliberately strict. It only converts clean numbers and exact true/false; it won't parse dates, currency, or numbers with thousands separators, and turning it on can strip leading zeros from things like IDs.
It produces a flat array of objects; it doesn't build nested structures from the CSV.

Privacy

Conversion runs entirely in your browser. Your CSV and the resulting JSON never leave your device.

Frequently asked questions

Is this CSV to JSON tool free?

Yes — free, no sign-up, no limits, runs in your browser.

Does my CSV need a header row?

Yes. The first row is used as the JSON object keys, so it should contain your column names.

Does it handle commas and quotes inside fields?

Yes. The parser understands quoted fields, so commas, line breaks and doubled quotes inside a quoted value are handled correctly.

Will my numbers become actual numbers?

Only if you turn on type conversion, which types clean numbers and true/false. With it off, everything stays a string — useful for IDs or ZIP codes with leading zeros.

What happens with duplicate column names?

They map to the same JSON key, so the last column with that name wins and overwrites the earlier one. Use unique headers to avoid losing data.

Can it create nested JSON?

No. It produces a flat array of objects, one per row; it doesn't build nested structures.

Is my CSV uploaded?

No. Everything runs locally in your browser; nothing is sent or stored.

Written by Lakshay Kumar(TechLakshay)

A QA Automation Engineer by trade, Lakshay's real passion is untangling complex problems into simple, working solutions — which is exactly why FreeMyTask exists. On Instagram, he channels that same instinct into helping 26,000+ content creators with SEO education, motivation, and hands-on query solving.

Last updated: August 22, 2026