JSON Flattener Online - Flatten Objects to Property Paths
Flatten nested JSON objects and arrays into a map of dollar-prefixed dot property paths.
About this tool
The recursive walker visits object keys and array indexes. Leaf values and empty containers are returned under paths such as $.user.name and $.items.0.
How to use
- Enter or select the source data.
- Run the tool locally with the required options.
- Review and copy or download the result.
Features
- Nested object paths.
- Array index paths.
- Preserves leaf JSON values.
Common use cases
- Inspect deeply nested API data.
- Compare paths across payloads.
- Prepare key-value style debugging output.
Common issues and tips
- Keys containing literal dots are not escaped, so paths can be ambiguous.
- The tool flattens structure and does not provide reverse unflattening.
Privacy
Processing runs locally in your browser. Input and generated output are not uploaded to Tools12345.
Frequently asked questions
Are arrays supported?
Yes, indexes become path segments.
What is the root marker?
$.
Can it unflatten JSON?
No.