JSON to CSV Converter
Convert JSON arrays and nested API responses into clean CSV spreadsheets with automatic key flattening and download export.
Ready to use JSON to CSV Converter?
Runs instantly in your browser sandbox. No sign-up required.
Recursively converts nested JSON objects into dot-notated CSV headers.
Export formatted .csv files directly from your browser memory.
Your sensitive data never touches an external server network.
Converting JSON Payloads to Tabular CSV Data
JSON objects store data hierarchically, while CSV files require flat rows and columns. Our converter uses a recursive flattening algorithm to map deeply nested JSON trees into standard tabular spreadsheets.
Nested JSON Flattening Example
// Input JSON
[
{ "id": 1, "user": { "name": "Alice", "city": "Seattle" } },
{ "id": 2, "user": { "name": "Bob", "city": "Austin" } }
]
// Output CSV
id,user.name,user.city
1,Alice,Seattle
2,Bob,AustinFrequently Asked Questions
Does this converter upload my JSON file to a server?
No. The JSON to CSV converter runs 100% locally inside your browser memory using HTML5 Web Workers. Your data remains completely private.
How are deeply nested JSON objects flattened into CSV columns?
Nested keys are joined using dot notation (e.g. user.address.city). Arrays are converted into semicolon-separated strings or individual rows based on your settings.
What file size limit does the converter support?
Because processing happens client-side, performance depends on your computer’s RAM. Files up to 50MB parse seamlessly in under a second.