Free Developer Tool
JSON Unflattener
Convert flattened JSON back into nested objects and arrays.
What is JSON Unflattener?
The JSON Unflattener reconstructs nested JSON structures from flattened key-value pairs, making data easier to use in applications.
How to use
- Paste flattened JSON.
- Generate the nested structure.
- Copy the result.
Features
- Restore nested objects
- Support arrays
- Fast conversion
- Valid JSON output
Common Use Cases
- Rebuilding exported data
- Preparing API payloads
- Restoring configuration files
- Working with flattened datasets
Example
Input
{
"user.name":"John"
}Output
{
"user":{
"name":"John"
}
}FAQ
Can flattened JSON always be restored?
Yes, provided the flattened structure follows a supported key format.
Does it support arrays?
Yes. Array paths are reconstructed whenever possible.
Is the output valid JSON?
Yes. The generated result is valid nested JSON.
Missing a feature?
If this tool doesn't cover your use case or is missing functionality, please let me know through the Contact page.
New improvements and features are added based on user feedback.