COOKIE TOOLS · SERVER

Minecraft whitelist.json Builder

Validate a list of real Java usernames and UUIDs and export whitelist.json. Detect duplicates and invalid entries locally without account linking or a server connection.

FreeNo sign-upBrowser-basedJava 1.21.11 data

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Copy-ready output

How to use

Paste a JSON list of objects with name and uuid. Use actual account UUIDs from your trusted source.
Review validation results and download whitelist.json. An empty list is valid and remains visibly empty.

Examples

An empty JSON list []

A valid empty whitelist []

Two entries with names Cookie and cookie

Rejected as duplicate usernames

Supported versions & limitations

Verified Java dataset: 1.21.11

This tool validates the format; it cannot prove that a supplied UUID belongs to the supplied name. It never guesses UUIDs.
No lookup, login, account link or server write occurs. Maximum 1000 entries and 64 KiB JSON input.

Frequently asked questions

Will entering a name fetch its UUID?

No. Supply a real UUID yourself; a made-up UUID may be syntactically valid but will not whitelist the intended account.

Does an empty list mean everyone is allowed?

The file is simply empty. Whether a server enforces whitelist access depends on its separate configuration.

Sources

https://docs.papermc.io/paper/reference/server-properties/

Facts reviewed 2026-10-12. Supported scope and preview limitations are described above.