Stack Deobfuscator Mod allows mod developers to more easily identify issues in a non-development environment, as the errors are instantly human-readable. All errors displayed in the console and all crash reports will be remapped from unreadable production names (e.g. net.minecraft.class_310) to readable mapped names (e.g. net.minecraft.client.MinecraftClient).

Comparison:

Before

[23:13:08] [Render thread/ERROR]: Reported exception thrown!
net.minecraft.class_148: Manually triggered debug crash
at net.minecraft.class_309.method_1474(class_309.java:509) ~[client-intermediary.jar:?]
at net.minecraft.class_310.method_1574(class_310.java:1955) ~[client-intermediary.jar:?]
at net.minecraft.class_310.method_1523(class_310.java:1180) ~[client-intermediary.jar:?]
at net.minecraft.class_310.method_1514(class_310.java:801) ~[client-intermediary.jar:?]
at net.minecraft.client.main.Main.main(Main.java:237) ~[minecraft-1.19.4-client.jar:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:462) ~[fabric-loader-0.14.18.jar:?]
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.18.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.14.18.jar:?]
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:88) ~[NewLaunch.jar:?]
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:126) ~[NewLaunch.jar:?]
at org.prismlauncher.EntryPoint.main(EntryPoint.java:71) ~[NewLaunch.jar:?]
Caused by: java.lang.Throwable: Manually triggered debug crash
at net.minecraft.class_309.method_1474(class_309.java:506) ~[client-intermediary.jar:?]
... 10 more

After (yarn/quilt mappings):

[23:11:25] [Render thread/ERROR]: Reported exception thrown!
net.minecraft.util.crash.CrashException: Manually triggered debug crash
at net.minecraft.client.Keyboard.pollDebugCrash(Keyboard.java:509) ~[client-intermediary.jar:?]
at net.minecraft.client.MinecraftClient.tick(MinecraftClient.java:1955) ~[client-intermediary.jar:?]
at net.minecraft.client.MinecraftClient.render(MinecraftClient.java:1180) ~[client-intermediary.jar:?]
at net.minecraft.client.MinecraftClient.run(MinecraftClient.java:801) ~[client-intermediary.jar:?]
at net.minecraft.client.main.Main.main(Main.java:237) ~[minecraft-1.19.4-client.jar:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:462) ~[fabric-loader-0.14.18.jar:?]
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.18.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.14.18.jar:?]
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:88) ~[NewLaunch.jar:?]
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:126) ~[NewLaunch.jar:?]
at org.prismlauncher.EntryPoint.main(EntryPoint.java:71) ~[NewLaunch.jar:?]
Caused by: java.lang.Throwable: Manually triggered debug crash
at net.minecraft.client.Keyboard.pollDebugCrash(Keyboard.java:506) ~[client-intermediary.jar:?]
... 10 more

After (mojang mappings):

[23:04:12] [Render thread/ERROR]: Reported exception thrown!
net.minecraft.ReportedException: Manually triggered debug crash
at net.minecraft.client.KeyboardHandler.tick(KeyboardHandler.java:509) ~[client-intermediary.jar:?]
at net.minecraft.client.Minecraft.tick(Minecraft.java:1955) ~[client-intermediary.jar:?]
at net.minecraft.client.Minecraft.runTick(Minecraft.java:1180) ~[client-intermediary.jar:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:801) ~[client-intermediary.jar:?]
at net.minecraft.client.main.Main.main(Main.java:237) ~[minecraft-1.19.4-client.jar:?]
at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:462) ~[fabric-loader-0.14.18.jar:?]
at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74) ~[fabric-loader-0.14.18.jar:?]
at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23) ~[fabric-loader-0.14.18.jar:?]
at org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:88) ~[NewLaunch.jar:?]
at org.prismlauncher.EntryPoint.listen(EntryPoint.java:126) ~[NewLaunch.jar:?]
at org.prismlauncher.EntryPoint.main(EntryPoint.java:71) ~[NewLaunch.jar:?]
Caused by: java.lang.Throwable: Manually triggered debug crash
at net.minecraft.client.KeyboardHandler.tick(KeyboardHandler.java:506) ~[client-intermediary.jar:?]
... 10 more

Requirements:

Stack Deobfuscator Mod Download Links

Other Version:

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For Minecraft 1.20.5

Fabric version: Download from Server 1Download from Server 2

For All Versions from Minecraft 1.14.4 to Minecraft 1.20.4, 1.20.3, 1.20.2, 1.20.1

Fabric version: Download from Server 1Download from Server 2

For Minecraft 1.20.6

Fabric version: Download from Server 1Download from Server 2

For Minecraft 1.21.1, 1.21

Fabric version: Download from Server 1Download from Server 2

For Minecraft 1.21.3, 1.21.2

Fabric version: Download from Server 1Download from Server 2

For Minecraft 1.21.4

Fabric version: Download from Server 1Download from Server 2

For All Versions from Minecraft 1.14.4 to Minecraft 1.21.5

Fabric version: Download from Server 1Download from Server 2

For All Versions from Minecraft 1.14.4 to Minecraft 1.21.8, 1.21.7, 1.21.6

Fabric version: Download from Server 1Download from Server 2

For All Versions from Minecraft 1.14.4 to Minecraft 1.21.10, 1.21.9

Fabric version: Download from Server 1Download from Server 2

For All Versions from Minecraft 1.14.4 to Minecraft 1.21.11

Fabric version: Download from Server 1Download from Server 2

For All Versions from Minecraft 1.14.4 to Minecraft 26.1

Fabric version: Download from Server 1Download from Server 2

Filter by

For Minecraft 1.21.4

Fabric 314 KB May 5, 2026

For Minecraft 1.21.3, 1.21.2

Fabric 314 KB May 5, 2026

For Minecraft 1.21.1, 1.21

Fabric 206 KB May 5, 2026

For Minecraft 1.20.6

Fabric 206 KB May 5, 2026

For Minecraft 1.20.5

Fabric 206 KB May 5, 2026

For Minecraft 1.14.4 –> 26.1

Fabric 314 KB May 5, 2026

For Minecraft 1.14.4 –> 1.21.11

Fabric 314 KB May 5, 2026

For Minecraft 1.14.4 –> 1.21.10

Fabric 314 KB May 5, 2026

For Minecraft 1.14.4 –> 1.21.8

Fabric 314 KB May 5, 2026

For Minecraft 1.14.4 –> 1.21.5

Fabric 314 KB May 5, 2026

For Minecraft 1.14.4 –> 1.20.4

Fabric 206 KB May 5, 2026

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