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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.

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+ 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.