JSON/CSV to CSV Converter

A lightweight tool for converting structured JSON/CSV data into a clean CSV format, with support for flattening, filtering, and parsing date/time fields into epoch timestamps.

Features

• Upload multiple JSON files or a single CSV file
• Flatten nested JSON objects automatically
• Choose fields for type, value, start, and end entries
• Start and End fields are parsed and converted into epoch timestamps
• Combine date and time fields into a single epoch timestamp
• Filter JSON arrays by nested fields
• Preview both JSON data and the generated CSV (first 3 records)
• Download the generated CSV file easily

Technologies Used

• HTML5
• CSS3 (Responsive design, flexbox-based layout)
• Vanilla JavaScript (ES6+) (no external libraries)

Open in Browser

Simply open the index.html file in any modern browser.

No build process or installation required.

Preview here: https://i-samos.github.io/json-csv_parser/index.html

Usage

1. Upload one or more JSON files or a single CSV file.
2. Preview the uploaded data (JSON or CSV).
3. Select the required fields:
   • Type
   • Value
   • Start — Date/Time field parsed into epoch time
   • End — Date/Time field parsed into epoch time
4. (Optional) Combine a second time field with Start/End.
5. (Optional) Apply additional filters to nested array fields.
6. Click Generate CSV.
7. Review the CSV preview (first 3 rows).
8. Click Download CSV.

Project Structure

/index.html
/styles.css
/main.js

Contribution

Contributions, issues, and feature requests are welcome!

License

This project is licensed under the MIT License.