Last updated: March 2026
What Is a JSON to CSV Converter?
A JSON to CSV converter transforms JavaScript Object Notation data into Comma-Separated Values format. APIs return JSON, but spreadsheets, databases, and analytics tools often need CSV. This tool bridges the gap instantly.
Paste your JSON array, configure flattening and delimiter options, and download clean CSV ready for Excel, Google Sheets, or any data tool. No uploads, no signups, no limits.
Handling Nested JSON Objects in CSV
CSV is inherently flat \u2014 rows and columns, no nesting. When your JSON contains nested objects like {"user":{"name":"Alice","address":{"city":"NYC"}}}, you need a strategy to flatten them.
Dot-notation flattening (the default) creates column headers like user.name and user.address.city. This preserves the hierarchy in a readable way. Stringify puts the raw JSON string in a single column. Ignore skips nested fields entirely.
Frequently Asked Questions
How do I convert JSON to CSV?
Paste your JSON array of objects into the input box. The converter automatically generates CSV output with column headers from the object keys. You can customize the delimiter, quoting style, and how nested objects are handled. Copy or download the result.
Can JSON with nested objects be converted to CSV?
Yes. This converter offers three strategies: flatten with dot notation (user.name becomes a column header), stringify nested objects (the whole nested object becomes a string value), or ignore nested fields entirely. Dot-notation flattening is the default and most common approach.
What is CSV format?
CSV (Comma-Separated Values) is a plain-text format where each line is a data record and values are separated by commas. The first row usually contains column headers. It's universally supported by spreadsheet software (Excel, Google Sheets), databases, and data tools.
How are arrays handled in JSON to CSV conversion?
Arrays within JSON objects can be joined into a single comma-separated string (default), split into separate rows (one row per array element), or stringified as-is. The join approach is simplest and keeps the row count unchanged.
Is there a file size limit?
This converter runs entirely in your browser, so there's no server upload limit. Practical limits depend on your device's memory. Most modern browsers handle files up to 50–100 MB without issues. For very large files, you may notice a brief delay.
Is my data safe?
Yes. This tool runs 100% in your browser — your data is never uploaded to any server. Nothing is stored, logged, or transmitted. Close the tab and your data is gone.