DevAuth Neo
by litetex
DevAuth Neo lets development environments authenticate Minecraft accounts, so developers avoid repeated sign-ins when they launch test clients.
What it does
On the first launch the mod asks for Microsoft account credentials. After a successful sign-in it stores the generated tokens in accounts.json, and later launches reuse those tokens so the game starts as usual without another prompt. Console or log output shows what is required when authentication is missing.
Configuration is loaded dynamically and sorted by priority, with DevAuth disabled by default so it stays out of the way unless switched on. The simplest way to enable it is setting the matching system property, and a full list of options is available, with grant-flow options prefixed with microsoft.oauth2. Environment variables use the DEVAUTH prefix with uppercase property names in place of dots.
Files are published for Fabric only, and the code is open source under the GNU Lesser General Public License v3.0 or later. The client alone runs the mod, so servers do not need it. Snapshot builds are published alongside release builds.
Key features
Account sign-in for development
Authenticates Minecraft accounts inside development environments, storing tokens for reuse.
Token reuse
Tokens are delegated to the game at startup, so later launches proceed without a new sign-in.
Configurable options
Properties can be set through system properties or environment variables, and the account can be selected with -Ddevauth.account.
Token reset
Deleting the .dev-auth-neo folder in the user profile clears the stored tokens, and tokens can be revoked in Microsoft account settings.
Compatibility
Latest build for each game version and loader.
This mod also publishes snapshot builds. Snapshots are not shown in the matrix.
How it compares
Keychain: In-Game Account Manager is a Fabric client mod for 1.21.11 – 26.3, released under the MIT License and open source. IDELogin is a client mod for Fabric, Forge and NeoForge covering 1.20 – 26.2, also open source under the MIT License. Serverauth Mod is server-side only for Fabric, covers 1.20 – 26.1.2, and is open source under the MIT License, so it differs from DevAuth Neo in environment and in running on the server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| DevAuth Neo | Fabric | 1.21.11 – 26.3 | Client-side only | 2026-09-11 |
| Keychain: In-Game Account Manager | Fabric | 1.21.11 – 26.3 | Client-side only | 2026-10-10 |
| IDELogin | Fabric, Forge and NeoForge | 1.20 – 26.2 | Client-side only | 2025-02-03 |
| Serverauth Mod | Fabric | 1.20 – 26.1.2 | Server-side only | 2026-07-20 |
Questions
Does DevAuth Neo need to be installed on the server?
Which loader does DevAuth Neo support?
Where are the login tokens kept?
Does DevAuth Neo work on snapshot versions?
In the catalog
DevAuth Neo is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 8,071 mods support Minecraft 26.3.
More from litetex
Similar mods
What the author says
Authenticate Minecraft accounts in development environments. This is a "reincarnation" of DevAuth but improved, updated and available directly as a Fabric mod.
Official listing
- Modrinth page
- modrinth.com/mod/dev-auth-neo
- Owner
- litetex
- Published
- 2025-12-14
- Updated on Modrinth
- 2026-09-11
- Facts verified
- 2026-10-15