RegSyncFix
by ILikeFood971
RegSyncFix lets a Fabric client join a server even when Fabric API reports a registry sync error, so the connection can continue past the mismatch.
What it does
When a client and server disagree about registry contents, Fabric API normally stops the join with a sync error. RegSyncFix bypasses that check so the connection goes through. The mod is a simple Fabric mod that depends on Fabric API, and it does not change game content or the registries themselves. Either side can run it, and neither needs it to work.
The author describes the intent as a way to join cases where all content is known to work, even though the registry comparison would block the connection. The author tested it on 1.20.4 and expects it to work on other versions that Fabric API supports. Because it only skips the check, a server that is not running the same mods as the client may show unexpected behavior, and the author notes that mismatched mods can cause problems in play.
Setting the mod on the server can also disable registry syncs entirely, which keeps the mod from relying on a client-side check. Files are published for Fabric across 36 game versions, and the latest Fabric build is 1.0.3 for 1.21.4, released on 2025-03-02. The code is open source under the MIT License.
Key features
Skips the registry sync check
Fabric API's registry sync error no longer stops a connection, so a client can join a server that otherwise rejects it.
Server-side sync disable
Installed on a server, the mod can turn off registry syncs entirely, leaving the client connection unchecked.
Single dependency
The only required dependency is Fabric API, which the mod builds on for its Fabric integration.
Gallery
Compatibility
Latest build for each game version and loader.
1.21.x5 of 5 versions with builds
1.20.x7 of 7 versions with builds
1.19.x5 of 5 versions with builds
1.18.x3 of 3 versions with builds
1.17.x2 of 2 versions with builds
1.16.x6 of 6 versions with builds
1.15.x3 of 3 versions with builds
1.14.x5 of 5 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Players who already know their mods work together and need to join a server despite a registry sync error, and server owners who want to disable registry syncs. The mod is not intended for mixed mod sets where compatibility is unknown.
How it compares
Real Time Mod is a Fabric mod for 1.18.2 that is client and server and open source under the MIT License, so it covers a single version only. Data Reload is open source under the MIT License, runs on the client or the server and targets 1.17.1 – 1.21.1. RegSyncFix instead covers 1.14 – 1.21.4 and only skips the registry check, without adding gameplay features.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| RegSyncFix | Fabric | 1.14 – 1.21.4 | Client or server, optional | 2025-03-02 |
| Real Time Mod | Fabric | 1.18.2 | Client and server | 2022-07-01 |
| Data Reload | Fabric | 1.17.1 – 1.21.1 | Client or server, optional | 2024-07-08 |
Questions
Does RegSyncFix need Fabric API?
Does the server need RegSyncFix to let players join?
In the catalog
RegSyncFix is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 17,979 mods support Minecraft 1.21.4.
More from ILikeFood971
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What the author says
This is a simple Fabric mod that bypasses errors during registry syncs in Fabric API (example below). It can be used on the server side to disable syncs entirely, or you can install it on your client and the client will proceed despite the error. Tested on 1.20.4 but will probably work on just about any version of…
Official listing
- Modrinth page
- modrinth.com/mod/regsyncfix
- Owner
- ILikeFood971
- Published
- 2024-05-29
- Updated on Modrinth
- 2025-03-02
- Facts verified
- 2026-10-15