JSON Flatten to Dot Notation
Flatten a deeply nested JSON object into a single level map where each key is a dot notation path to a leaf value. This is exactly how tools like i18n translation files, feature flags and property config are often stored, and it makes deep structures far easier to search, diff and edit. This tool walks your JSON and joins nested object keys with dots, while array indices are written in bracket notation so paths stay unambiguous. Leaf values keep their real type, so numbers, booleans and null are preserved rather than stringified. Empty objects and empty arrays are represented explicitly so nothing silently disappears. Paste your nested JSON, click flatten, and copy the flat result. Everything runs locally in your browser, so private config never touches a server.
How to use JSON Flatten
- Paste your nested JSON.
- Click flatten to collapse it.
- Copy the dot-notation output.
Frequently asked questions
What does flattening produce?
It collapses a nested object into a single-level map where each key is the dot-notation path to the original value, for example user.address.city.
How are array items keyed?
Array positions become bracketed indices in the path, so an item might appear as tags[0] in the flattened output.
Why flatten JSON?
Flat dot-notation keys are easier to diff, search and load into tools that expect a single level of key-value pairs.
What is JSON Flatten?
Flatten a deeply nested JSON object into a single level map where each key is a dot notation path to a leaf value. This is exactly how tools like i18n translation files, feature flags and property config are often stored, and it makes deep structures far easier to search, diff and edit.
Is JSON Flatten free to use?
Yes. JSON Flatten is completely free, with no sign-up and no usage limits.
Does JSON Flatten work in a web browser?
Yes. JSON Flatten runs in any modern web browser. There is nothing to download or install.
Is my data private with JSON Flatten?
Yes. JSON Flatten runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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