Data Format Converter
Instantly convert between JSON, CSV, and Excel formats securely in your browser.
What is the Data Format Converter?
The Data Format Converter is a powerful utility designed to seamlessly translate tabular data between JSON, CSV, and Excel (.xlsx) formats.
Developers and data analysts constantly need to migrate data. This tool removes the need for writing custom parsing scripts or relying on clunky spreadsheet software. It runs completely locally in your browser, ensuring maximum privacy for your datasets.
How to use the Data Format Converter
- 1Paste your raw JSON or CSV into the input box, or drag and drop an existing .csv or .xlsx file.
- 2The tool will automatically parse and detect your data.
- 3Select your desired output format from the toggle buttons.
- 4Preview the generated data in the output panel and click "Download" to save the file instantly.
Key features
- ⚡ Instant Conversions: Instantly transforms huge JSON arrays into CSVs or Excel spreadsheets.
- 📁 File Uploads: Supports drag-and-drop for .csv and .xlsx files, making it easy to convert Excel files directly into JSON.
- 🔒 100% Private: All processing is done locally via client-side JavaScript. Your sensitive data is never uploaded to any server.
- 💾 Direct Downloads: Generate and download the converted files directly from the browser.
Examples
JSON to CSV
[
{ "name": "John", "age": 30 },
{ "name": "Alice", "age": 28 }
]name,age
John,30
Alice,28Why use this tool
- Saves time by removing the need for intermediary scripts or Python pandas code.
- Securely handles sensitive data without the risks associated with server-based converters.
- Handles complex CSV quoting and JSON serialization automatically.
Frequently asked questions
Are my Excel files uploaded?
No. The conversion uses a client-side library (SheetJS) to read and parse the Excel file directly inside your browser memory. Nothing is ever uploaded over the internet.
Can it convert complex nested JSON?
The tool is optimized for tabular data (arrays of flat objects). Deeply nested JSON may be stringified or omitted in CSV/Excel formats.
Is there a file size limit?
Yes. To prevent your web browser from freezing while parsing huge datasets into text, there is a strict 500KB file size limit for uploads.
All Developer Tools
Tap any tool to jump straight in — no signup, works on mobile.