JSON to CSV Converter — Free Online Tool

What is JSON to CSV conversion?

JSON to CSV conversion transforms structured data from JavaScript Object Notation into a flat, tabular format suitable for spreadsheets and databases. JSON is the dominant data format for web APIs, configuration files, and NoSQL databases, while CSV remains the universal standard for data exchange between applications like Excel, Google Sheets, and relational databases.

The conversion process extracts all unique keys from your JSON objects to create CSV column headers, then maps each object's values into corresponding rows. Nested objects can be flattened into dot-notation columns (e.g., address.city), and arrays are serialized into comma-separated strings within a single cell. The output follows the RFC 4180 specification so it opens directly in Excel, Google Sheets, and any database import tool.

Example: JSON to CSV conversion

Starting with this JSON array:

[
  { "name": "Alice", "email": "alice@example.com", "role": "Engineer" },
  { "name": "Bob", "email": "bob@example.com", "role": "Designer" },
  { "name": "Charlie", "email": "charlie@example.com", "role": "Manager" }
]

The converter produces this CSV output:

name,email,role
Alice,alice@example.com,Engineer
Bob,bob@example.com,Designer
Charlie,charlie@example.com,Manager

Handling nested JSON

Real-world JSON often contains nested objects and arrays. Our converter handles this with configurable flattening:

[{
  "name": "Alice",
  "address": { "city": "New York", "zip": "10001" },
  "skills": ["JavaScript", "Python"]
}]

With flattening enabled, this becomes:

name,address.city,address.zip,skills
Alice,New York,10001,"JavaScript, Python"

Common use cases