Flatten JSON Object
Flatten deeply nested JSON objects into one level with dotted keys instantly. Free online JSON object flattener. No sign
Result will appear here...
How to Use Flatten JSON Object
- Paste a nested object: Paste a JSON object with nested objects/arrays into the input box, or load the sample.
- Click Flatten Object: Press the Flatten Object button. Keys become dotted paths like a.b.c and items[0].
- Copy the flat object: Copy the single-level object for key-value stores, diffs or indexing.
About Flatten JSON Object
Flatten JSON Object converts deeply nested objects into a single level using dot notation.
- Dotted Keys: {"a":{"b":1}} becomes {"a.b":1}.
- Array Indexes: Array values use index paths like "items[0]".
- No Data Loss: Empty objects and arrays are preserved in the output.
Ideal for key-value stores, diffing, indexing and database column mapping.
Frequently Asked Questions
What does flattening a JSON object do?
It converts deeply nested objects into a single level using dot notation — {"a":{"b":1}} becomes {"a.b":1} — and arrays use indexes like "items[0]".
Why flatten JSON objects?
Flat objects are easier to store in key-value databases, compare in diffs, index in search, and map into database columns.
What about empty nested values?
Empty objects and empty arrays are preserved as "{}" and "[]" so no structure information is lost.