JSON to CSV / CSV to JSON Converter

Features

This online JSON ↔ CSV converter quickly transforms a JSON array into a CSV table, or a CSV table back into a standard JSON array of objects, all inside your browser. Deeply nested JSON objects can be automatically flattened using a custom key separator of your choice, and the same separator can un-flatten dotted column names (like address.city) back into nested objects on the way back. Parsing and export are fully local, so customer lists, user exports, API responses and other sensitive data never get sent to a remote server.

When You Need This

Common pain points this tool solves

1. Turn an API JSON response into CSV for pivot tables and charts in Excel, Numbers or Sheets
2. Import a marketing or operations CSV export into scripts and pipelines as structured JSON
3. Flatten complex nested JSON into a simple CSV so it loads into relational databases or BI tools
4. Grab a JSON payload while debugging a backend, paste it here and export a shareable table for teammates

How to Use

Step-by-step instructions

1. Choose the direction: JSON → CSV or CSV → JSON. Default sample contents are swapped for you.
2. Paste your input into the left editor.
3. Tune the options: flatten nested JSON, pick a CSV delimiter, and set the key separator for nesting.
4. The right panel updates in real time; copy the output or download it as a file.

Why Choose Korelyy

What makes us better

1. Two-way conversion with nested flattening and un-flattening, all in one place.
2. Everything runs in the browser. Your CSV and JSON data never leave your machine.
3. Multiple CSV delimiters out of the box (comma, semicolon, Tab, pipe), including the formats used in German-speaking regions.

Monetize With This Tool

Turn this tool into a side income stream

1. Use this tool to speed up your freelance work and take on more paying clients
2. Create polished content faster for your blog, YouTube channel, or social media and grow your audience
3. Offer this tool's capabilities as a service on Fiverr, Upwork, or to your local business clients

Frequently Asked Questions

1. Is JSON to CSV / CSV to JSON Converter free to use?

   Yes. JSON to CSV / CSV to JSON Converter is 100% free for core features — no signup, no watermarks, no hidden paywalls on the tools you need day to day.

2. Do I need to sign up to use JSON to CSV / CSV to JSON Converter?

   No. Open and use instantly in your browser. Nothing to install, no account required. Your preferences stay on your device.

3. Is my data safe with JSON to CSV / CSV to JSON Converter?

   Yes. JSON to CSV / CSV to JSON Converter runs locally in your browser whenever technically possible — sensitive inputs are processed on your device, not on our servers. No tracking cookies.

4. Which devices does JSON to CSV / CSV to JSON Converter work on?

   Phones, tablets and desktops with any modern browser (Chrome, Safari, Edge, Firefox). Touch-friendly and responsive from 320px to 4K.

5. How do I convert JSON to CSV and vice versa?

   Paste your JSON or CSV text into the input area and click the convert button. For JSON to CSV, the tool flattens nested objects into dot-notation columns. For CSV to JSON, each row becomes a JSON object with the header row as keys.

6. How are nested JSON objects handled in CSV?

   Nested objects are flattened using dot notation (e.g., address.city, address.zipcode). Arrays are joined with commas or you can choose to expand them into separate columns.

7. Is my data safe during conversion?

   Yes, all processing happens in your browser. No data is sent to our servers. The tool works entirely client-side for privacy-sensitive data.