What is CSV ↔ JSON Converter?
CSV ↔ JSON Converter transforms spreadsheet-style CSV data into JSON and turns JSON back into CSV. It detects the delimiter automatically (comma, semicolon, tab or pipe), handles quoted fields with commas and line breaks, and can convert numbers, booleans and empty values into proper JSON types.
For JSON to CSV, nested objects are flattened into dot-notation columns so every value lands in a cell. A live table preview shows exactly what you’ll get, and the result can be copied or downloaded — with an Excel-friendly option for CSV. Files are converted in your browser and never uploaded.
How to use CSV ↔ JSON Converter
Get it done in 4 simple steps — no installation or account needed.
- Choose a direction: CSV → JSON or JSON → CSV.
- Paste your data or drop a .csv / .json file onto the upload area.
- Adjust options like header row, delimiter and type detection — the output and table preview update instantly.
- Copy the result or download it as a file.
Limitations & supported browsers
Works in the latest Chrome, Edge, Firefox, Safari (Mac, iPhone and iPad) and Samsung Internet. Because processing happens on your device, speed and maximum file size depend on your device’s memory.
- Excel workbooks (.xlsx) must be saved as CSV first (File → Save As → CSV UTF-8).
- Very large files (hundreds of MB) can exceed browser memory; the table preview shows the first 100 rows.
- JSON → CSV expects an array of objects (or a single object). Arrays inside values are joined with “; ”.
Who needs CSV ↔ JSON Converter?
From students to professionals, here’s who gets the most out of CSV ↔ JSON Converter — and why.
Developers
Turn spreadsheet data into JSON fixtures, seed data or API payloads.
Data analysts
Flatten JSON API responses into CSV for Excel or Google Sheets.
No-code builders
Move data between tools like Airtable, Zapier and spreadsheets.
Students
Convert datasets for coursework and data science projects.
Is CSV ↔ JSON Converter safe to use?
Yes. CSV ↔ JSON Converter runs entirely in your web browser using JavaScript. Your files and data are processed on your own device and are never uploaded to AppsOcean or any third-party server. There’s nothing to install, no account to create, and it’s completely free.Read our privacy policy.
CSV ↔ JSON Converter — frequently asked questions
How do I open the CSV correctly in Excel?
Tick “Excel-friendly” before downloading. It adds a UTF-8 marker so Excel shows accented and non-English characters correctly.
What happens to nested JSON objects?
They are flattened into columns with dot notation, e.g. {"user":{"name":"Asha"}} becomes a “user.name” column. Arrays of simple values are joined with a semicolon.
Are my files uploaded to a server?
No. Everything is processed locally in your browser using JavaScript. Your files never leave your device, and nothing is stored on our side.
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