Convert CSV to JSON online in one click — turn a spreadsheet export (with a header row) into a clean JSON array of objects, or convert JSON back to CSV. Free, instant, and 100% private: your data never leaves your browser.
Data • CSV/JSON
Built on internationally recognised SI and standards-body conversion factors for dependable results.
Results update live as you type, with a clear visual breakdown across every unit at once.
Everything runs in your browser — no account, no uploads, nothing leaves your device.
CSV (comma-separated values) is the universal way spreadsheets and databases export tabular data — every version of Excel, Google Sheets, Numbers, and virtually every analytics or e-commerce platform can produce it. JSON (JavaScript Object Notation) is the language of the modern web: REST APIs, JavaScript apps, NoSQL databases, configuration files, and no-code tools all speak JSON. Converting CSV to JSON is one of the most common day-to-day tasks for developers, data analysts, marketers, and students across the US — and this tool does it instantly, for free, without uploading a single byte.
How the conversion works. The first line of your CSV is treated as the header row, and each header becomes a key. Every following row is turned into a JSON object that pairs those keys with the row values, and all the objects are collected into a JSON array. Fields that contain commas, quotes, or line breaks are parsed using the RFC 4180 standard (double-quoted, with doubled quotes for escaping), so messy real-world exports convert cleanly. Flip the toggle and the same engine runs in reverse, rebuilding a spreadsheet-ready CSV from a JSON array.
What people use it for. Seeding a database or web app with spreadsheet data; feeding JSON into a JavaScript front-end or a Python script; building mock/sample API responses for testing; importing a Google Sheets or Excel export into a no-code platform (Airtable, Zapier, Make, Bubble); migrating product catalogs, contact lists, or survey results; and learning how tabular data maps to structured JSON. Because it is two-way, it is just as handy for analysts who receive a JSON payload and need it back in a spreadsheet.
Why this converter. It is completely free with no sign-up, runs entirely in your browser for total privacy, updates the output live as you paste, supports quoted fields, works on iPad, desktop and mobile, and lets you copy the result with one tap. There is nothing to install and nothing to trust with your data — ideal for proprietary, financial, or personal records.
name,age,city with a row John,30,New York produces {"name":"John","age":"30","city":"New York"}."Austin, TX" is handled correctly.csv.DictReader with json.dumps(). In JavaScript, split on newlines/commas or use a library like PapaParse. This tool is the fastest no-code option when you just need the JSON now without writing a script.