Free online JSON flatten tool. Convert nested JSON objects into a flat structure with dot-notation keys. Ideal for data processing and database imports. Runs locally in your browser.
100% Local
How to Use the JSON Flatten
Paste nested JSON into the input box. Click Flatten and the nested structure is converted to a single-level flat object using dot notation for paths and bracket notation for array indices. Use Clear to reset.
How keys are generated
Nested object paths use dot notation: user.name
Array indices use bracket notation: items[0].id
Deeply nested paths are chained: user.address.city
Leaf values remain unchanged in the flat object
Features
Handles arbitrary nesting depth without limit
Produces a clean single-level object ideal for database imports
Reversible with the Unflatten tool
All processing runs locally in your browser. Your data is not uploaded to any server.