Is JSON Flattener free to use?

Yes, JSON Flattener is completely free to use. No signup or registration required.

Is my data safe when using JSON Flattener?

Yes, all processing happens in your browser. Your data never leaves your device and is not stored on any server.

Can I use JSON Flattener on mobile?

Yes, JSON Flattener is fully responsive and works on all devices including smartphones and tablets.

AltraTools - Free Online Developer Tools

Free JSON Flattener Tool

Convert nested JSON objects to flat dot-notation format, or restore flattened JSON back to nested structure. Essential for form handling, database operations, and data transformations.

Features

Flatten: Convert nested objects to dot notation paths
Unflatten: Restore nested structure from flat format
Array Support: Handles arrays with bracket notation
Custom Separator: Use dots, underscores, or custom separators
Preserves Types: Maintains data types accurately

Use Cases

Form data serialization, MongoDB/Firebase data operations, URL query parameter handling, environment variable management, and data migration between formats.