CSV to JSON

Paste CSV and get clean JSON — headers become keys, with optional number and boolean detection. Nothing is uploaded.

Files never uploadedNo sign-upWorks in your browserFree & unlimited
Delimiter:

Convert in 3 simple steps

1

Paste your CSV

Paste CSV text or copy a range straight from Excel or Google Sheets.

📋
2

Pick options

Choose the delimiter and whether the first row is a header.

⚙️
3

Copy or download

Get formatted JSON and copy it or download a .json file.

⬇️

Why use this CSV to JSON converter

🔤

Headers as keys

Your first row becomes the object keys, so JSON comes out readable and ready to use.

🧠

Smart typing

Optionally turn numbers, booleans and null into real JSON types instead of strings.

🧩

Quotes & commas handled

Quoted fields with commas, line breaks and escaped quotes are parsed correctly.

🔀

Any delimiter

Comma, semicolon, tab or pipe — paste from any spreadsheet or export.

🔒

100% private

Runs in your browser; your CSV is never uploaded to a server.

🆓

Free & unlimited

No sign-up, no limits — works offline once the page has loaded.

Turn spreadsheet data into JSON

CSV is how spreadsheets and databases export tabular data, but code and APIs almost always want JSON. This converter bridges the two: paste a CSV export, and each row becomes a tidy JSON object using your header row as the keys. It handles the awkward cases properly — quoted fields containing commas or line breaks, escaped quotes, and alternative delimiters like semicolons or tabs.

Turn on number and boolean detection to get real JSON types instead of strings, or leave it off to preserve values exactly (handy for IDs with leading zeros). Everything runs in your browser, so even sensitive data stays on your device.

CSV to JSON for developers

Seed a database, mock an API response, or feed a front-end fixture in seconds. Once you have your JSON, tidy it with the JSON formatter, or reach for the Base64 encoder and UUID generator. Browse the rest on the developer tools page.

More developer tools

JSON FormatterBeautify, minify & validate JSON.Open tool Base64 Encode/DecodeText ↔ Base64, Unicode-safe.Open tool URL Encode/DecodeEscape & unescape URLs and params.Open tool UUID GeneratorRandom UUID v4, single or bulk.Open tool

Frequently asked questions

How do I convert CSV to JSON?
Paste your CSV into the box, keep “First row is header” ticked if your first line contains column names, then click Convert to JSON. Each row becomes a JSON object whose keys are the header names, and you can copy or download the result.
Does it handle commas and quotes inside fields?
Yes. The parser follows the common CSV rules: fields wrapped in double quotes can contain commas, line breaks and escaped quotes (written as two double quotes), so values like "Smith, John" stay in one field.
Can I use a semicolon or tab delimiter?
Yes. Choose comma, semicolon, tab or pipe as the delimiter. Semicolon is common in European spreadsheets, and tab lets you paste straight from Excel or Google Sheets.
What does “detect numbers and booleans” do?
With it on, values like 42 and 3.14 become JSON numbers, true/false become booleans and null becomes null, instead of everything being a string. Turn it off if you need every value kept as text — for example ID codes with leading zeros.
Is my data uploaded anywhere?
No. The conversion runs entirely in your browser using JavaScript. Your CSV never leaves your device, which makes it safe for private or sensitive data.
What if my CSV has no header row?
Untick “First row is header”. Each row is then converted to a JSON array of values instead of an object, so no data is lost.
Is there a row limit?
There's no hard limit — it's bound only by your browser's memory. Very large files (hundreds of thousands of rows) may be slow, but typical spreadsheets convert instantly.

By Narender Chaudhary, Editorial & Product Lead · Updated June 2026