Runtime Hash Updater
Runtime Hash Updater lets a server owner change the SHA1 hash of a server resource pack while the server keeps running, so players receive the new pack without a restart.
What it does
Standard servers read the resource pack hash from server.properties only at startup, so any pack change normally means stopping the server, editing the file and starting it again. This Fabric mod recalculates the hash of the pack on the server and updates the value during play, so a new pack can be offered to players who join or are already connected.
When a player joins, the server checks the current hash and can prompt that player to install the new resource pack. Once the new hash is stored, a player who saves the file and reconnects receives the updated pack. The mod can calculate the hash automatically with fetchhash, which is useful for large packs since the calculation can take a few seconds and may affect performance.
The mod is open source under the CC0 1.0 Universal license and runs on the server only, so players join without installing anything. Builds exist for Fabric across 19 release versions, 1.19 – 26.3, and Fabric API is not listed as a dependency.
Key features
Hash update without restart
The server pack hash is changed while the server keeps running, so no restart is needed after a pack edit.
Prompt on join
Players who join are asked to install the new resource pack when the server pack has changed.
Automatic hash calculation
The fetchhash command calculates the SHA1 hash of the pack, so the owner does not compute it by hand.
Custom pack hosting
A pack hosted on a third party service can be set with setpackurl, without serving the pack from the server itself.
Gallery
Compatibility
Latest build for each game version and loader.
26.x3 of 3 versions with builds
1.21.x7 of 7 versions with builds
1.20.x5 of 5 versions with builds
1.19.x4 of 4 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Frequently changed packs
Servers that add custom models or textures often can update the pack without asking players to wait for a restart.
Who it’s for: Server owners who run a custom resource pack and want to change it without stopping the server. Players only need the vanilla client, since the mod runs on the server alone.
How it compares
Better Server Packs (Fabric) is also server-side only and open source under the MIT License, with builds for 1.21 – 26.3. Mods Updater is a client-side only Fabric mod under the MIT License, published for 26.1.2, so it does not run on a server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Runtime Hash Updater | Fabric | 1.19 – 26.3 | Server-side only | 2026-09-15 |
| Better Server Packs (Fabric) | Fabric | 1.21 – 26.3 | Server-side only | 2026-09-21 |
| Mods Updater | Fabric | 26.1.2 | Client-side only | 2026-05-17 |
Questions
Does Runtime Hash Updater need to be installed on the client?
Does Runtime Hash Updater require Fabric API?
Which game versions does Runtime Hash Updater support?
In the catalog
Runtime Hash Updater is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 8,071 mods support Minecraft 26.3.
More from robotmonkey1000
Similar mods
What the author says
This is a simple Fabric mod that enables you to update the hash for your server resource pack while the server is still running. If you are anything like me, I like to constantly add new custom models to my resource pack just to add a little extra customization to Vanilla Minecraft. I do not like however having to…
Official listing
- Modrinth page
- modrinth.com/mod/sha1runtime
- Owner
- robotmonkey1000
- Published
- 2023-01-13
- Updated on Modrinth
- 2026-09-15
- Facts verified
- 2026-10-15