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JSON Flatten Unflatten Online

Convert nested JSON to flat key-value pairs and back.

Step 1: Choose direction

Click Flatten to convert nested to flat. Click Unflatten to restore.

What does flattening do?

Converts nested keys to dot notation like user.address.city.

Is the flatten tool free to use?

Yes, our flatten tool is completely free. No registration, no limits.

Can I use this flatten tool on mobile?

Yes, all tools including flatten are fully responsive. Works on all devices.