Free JSON to CSV Converter

Transform JSON objects, API responses, and database exports into Excel-ready CSV spreadsheets instantly in your browser.

At a glance

JSON to CSV Converter is a free, client-side tool that converts JSON arrays and nested data into clean CSV or Excel spreadsheet tables online. Automatically flattens multi-level nested JSON trees (e.g. user.address.city) into clean spreadsheet columns. Processing happens entirely on your device — nothing is uploaded and no account is required.

Universal Switcher:
From:
To:

100% Client-Side Conversion

API responses and confidential JSON documents are processed locally in your web browser. Zero server uploads.

Private & Offline
JSON → CSV Table

Choose a JSON file or drag & drop here

Supports .json files of any size

0 bytes
Records: 0 Columns: 0
0 B
Open in CSV to JSON
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Why Use This JSON to CSV Converter?

Deep Dot-Notation Flattening: Automatically flattens multi-level nested JSON trees (e.g. user.address.city) into clean spreadsheet columns.
Universal Schema Discovery: Scans all items across the JSON payload to discover every unique key, preventing missing data in uneven records.
RFC 4180 Escaping: Safely handles text cells containing commas, line breaks, and quotation marks without breaking Excel columns.
100% Private Client-Side Conversion: Entire conversion runs locally in browser RAM—safe for API keys, sensitive customer records, and financial numbers.

How to Use JSON to CSV Converter

1

Upload or Paste JSON

Drag and drop your .json file into the upload zone or paste raw JSON arrays into the input editor.

2

Configure Delimiter & Flattening

Select your desired delimiter (comma, semicolon, tab, pipe) and choose whether to flatten nested structures.

3

Copy or Download CSV

Preview your converted spreadsheet table in real-time, copy directly to clipboard, or download as a .csv file.

Worked example: JSON to CSV Converter

Executed entirely inside your local browser memory using modern Web APIs. The engine verifies input syntax, performs deterministic transformation, and exposes instant copy or download options.

Sample JSON Data Source 
sample_payload.json (Valid format conforming to JSON specification)
Resulting CSV Output Processed 
converted_result.csv (100% client-side)

Technical Specifications & Engine Details

Technical specifications and engine details for JSON to CSV Converter
Specification Details
Supported Formats JSON, TXT → CSV, TSV
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Requires modern web browser with ECMAScript 6+ and standard DOM Web APIs.
Performance Constraints Client browser memory limit (typically 1–2 GB RAM); processing speed depends on local device CPU.
Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

All JSON parsing and CSV generation are processed locally in your browser memory. No data is ever sent to external servers.

Frequently Asked Questions

How does this tool handle nested JSON objects?
By default, the tool flattens nested objects into dot-notation column names (for example, a nested field {"user": {"email": "..."}} becomes the column 'user.email'). This preserves all data structure when importing into Excel or Google Sheets.
Does this tool upload my JSON data to a server?
No. All parsing and CSV conversion happen 100% in your local browser memory using JavaScript. No payload is ever sent over the internet or logged.
What happens if some objects have different keys than others?
The converter analyzes every record in the array and compiles a master list of all unique columns. Any record that lacks a specific key is automatically padded with an empty cell, ensuring all columns align properly.
Why would I choose a semicolon delimiter instead of a comma?
In many European versions of Microsoft Excel, a semicolon is used as the standard list separator because commas represent decimal marks. Choosing semicolon allows one-click opening in European Excel without text-import wizard hassles.

Methodology

This tool runs entirely in your browser. The example above shows a representative input and the result it produces.

Last updated .

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