VIAaaS

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ViaVersion as a Service - standalone ViaVersion proxy

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How to use: server.example.com._p25565._v1_12_2._uBACKUSERNAME.viaaas.example.com (similar to tor to web proxies)

Default WS URL: wss://localhost:25543/ws

VIAaaS auth page is designed for storing accounts in the player's browser local storage. It requires a CORS Proxy for calling Mojang APIs, which may make Mojang see that as suspicious and reset/block your account password if the IP address is suspect.
There are some information about Mojang password resetting: https://github.com/GeyserMC/Geyser/wiki/Common-Issues#mojang-resetting-account-credentials and https://mobile.twitter.com/MojangSupport/status/863697596350517248
VIAaaS may have security vulnerabilities, make sure to block the ports in firewall and take care of browser local storage.

Requires Java 11

Usage for offline mode:

Usage for online mode:

You can use two accounts (avoids Bad Login error) or the same account for front-end and back-end connections.
Run the shadow jar or ./gradlew clean run
You should set up a CORS Proxy (something like https://www.npmjs.com/package/cors-anywhere, git clone https://github.com/Rob--W/cors-anywhere && cd cors-anywhere && npm install && node server.js) on local machine.
Go to https://localhost:25543/, configure the CORS Proxy URL (something like http://localhost:8080/, note the ending slash) and listen to the username A that you're using to connect to the proxy.
Add the account B you'll use in _u parameter to browser auth page.
Connect to mc.example.com._v1_8._u(account B).viaaas.localhost ("_u" can be removed if you are using the same account)
Approve the login
Minecraft client will give Bad Login after you approve the login in your browser if you are using the same account. You can use https://www.curseforge.com/minecraft/mc-mods/auth-me for reauthenticate the client.

WARNING

VIAaaS may trigger anti-cheats, due to block, item, movement and other differences between versions. USE AT OWN RISK

VIAaaS is stuck when connecting with online mode: