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JSON to CSV Converter

Convert JSON data arrays into CSV spreadsheets with automatic column detection, nested object flattening, and live table preview. Export ready-to-use CSV files for Excel, Google Sheets, and databases.

3 rows · 5 columns
JSON Array 23 lines · 388 chars
CSV Output 4 lines
#nameemailageroleactive
1Alice Johnsonalice@example.com29Developertrue
2Bob Smithbob@example.com34Designerfalse
3Carol Williamscarol@example.com27Managertrue
Raw CSV
name,email,age,role,active
Alice Johnson,alice@example.com,29,Developer,true
Bob Smith,bob@example.com,34,Designer,false
Carol Williams,carol@example.com,27,Manager,true

All conversion runs entirely in your browser. Your data is never sent to any server.

JSON is the universal data format for APIs and web applications, but when it comes to data analysis, reporting, or importing into spreadsheets, CSV (Comma-Separated Values) is the lingua franca. Our free JSON to CSV Converter bridges this gap instantly — paste any JSON array and get a properly formatted, header-detected CSV output with a live table preview. Nested objects are automatically flattened using dot notation, arrays and special characters are safely escaped, and you can preview the result as a sortable table before copying or downloading. Every byte of data stays in your browser — no uploads, no server processing, no privacy risk.

How to Use the Converter

  1. Paste your JSON array — Enter valid JSON in the left panel. The converter expects a top-level array of objects. Single objects or malformed JSON will show a clear error message.
  2. Review automatic columns — The tool scans all objects to auto-detect every unique key. Nested objects are flattened into columns like address.city.
  3. Inspect the table preview — The right panel shows a full table with row numbers and all detected columns. Hover over truncated cells to see the complete value in a tooltip.
  4. Copy or download CSV — Click Copy CSV to grab the output to your clipboard, or Download CSV to save a data.csv file ready for Excel, Google Sheets, LibreOffice, or database import.

Key Features

  • Auto Column Detection

    Scans all objects to find every unique key across the entire dataset. Handles sparse data where not every row has every column.

  • Nested Object Flattening

    Deeply nested objects are flattened using dot notation (e.g., user.address.city) for clean column names.

  • Live Table Preview

    Interactive table with sticky headers, row numbers, and hover-highlighted rows for easy data inspection.

  • Smart CSV Escaping

    Values containing commas, quotes, or newlines are automatically wrapped in double quotes with proper escaping per RFC 4180.

  • Real-Time Conversion

    Every keystroke re-parses the JSON and regenerates the CSV — no buttons, no delays, instant feedback.

  • 100% Client-Side

    All conversion happens in your browser. Your data never touches a server — no uploads, no tracking, no privacy concerns.

Frequently Asked Questions

How are nested objects handled?
Nested objects are flattened into dot-notation columns. For example, { "user": { "name": "Alice", "age": 29 } } produces columns user.name and user.age. Arrays are joined with semicolons. This works recursively for any depth.
Can I convert a single JSON object?
The converter expects a top-level JSON array. If you have a single object, wrap it in square brackets: [{ "key": "value" }]. An error message will guide you if the input format is not valid.
What CSV standard does this tool follow?
The output follows RFC 4180 — the standard CSV format. Values containing commas, double quotes, or newlines are properly escaped by wrapping in double quotes and doubling any internal quotes. The output is compatible with Excel, Google Sheets, LibreOffice, MySQL LOAD DATA INFILE, and virtually any CSV parser.
Is my data safe and private?
Absolutely. All JSON parsing and CSV generation runs entirely in your browser. Your data never leaves your device — no uploads, no server processing, no logging whatsoever.