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Flatten JSON
Processed Locally
Convert nested JSON objects into flat key-value pairs using dot notation
Options
Frequently Asked Questions
JSON flattening converts nested JSON objects into a flat structure where nested keys are combined using a separator (like "user.name" instead of {"user": {"name": "..."}}). This is useful for databases, CSV conversion, or data analysis.
Yes! You can use dot (.), underscore (_), slash (/), or any custom separator. The default is dot notation (.) which is commonly used in JavaScript object paths.
By default, arrays are flattened with numeric indices (e.g., "items.0", "items.1"). Enable "Preserve Arrays" to keep arrays intact in the output.
Absolutely! All flattening happens locally in your browser. Your JSON data is never sent to our servers.