ModsJava
Essential Core - Inspect Blocks/Entities/Chunks/Players
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
Essential Core is an effective mod for server security. Restore inventories, chunks, inspect blocks, entities, etc., and enjoy advanced logs.
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.



Essential Core
Our multi-threaded processing allows you to get the best performance when using the mod.
Overview
• Records player actions (block breaking/placement, interactions, containers, etc.)
• Open Inventories, Ender Chests, and offline player ender chests.
• Performs periodic backups of player inventories and chunks
• Allows for rollback/restore of chunks and inventories
• Has an interactive inspector (with pagination) for consulting history
• Uses background processing (multithreaded) to avoid lagging the server
Core Features
• Fast and efficient data logging for various categories (blocks, containers, interactions, chat, commands, etc.).
• Rollbacks and restores (player/chunk) via commands.
• Multi-threaded
• Logs in files by category → player → date: essential-core /logs/<category>/<player>/<dd-MM-yyyy>.log.
Configurable via config.toml (enable/disable logs, command filter, and thread count).
• Inspector with pagination and clickable buttons for navigation.
• Undo to revert the last rollback.
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What does it log?
• NEW: inventory — Player inventory log
• NEW: enderchest — Player enderchest log
• The implemented log categories (FileLogger.java file) include — each log goes to essential-core/events/<category>/<player>/<date>.log:• block_break — block breaking by player
• block_place — block placement
• interactions — interactions with blocks/entities (right-click)
• containers — container opening with summarized content
• chat — chat messages
• commands — commands executed by players (filterable)
• sessions — player login/logout
• item_pickups — picking up items from the ground
• item_drops — dropped items (Event: EntityJoinLevel detects ItemEntity)
• item_transactions — (method exists in FileLogger; see note below)
• dimensions — dimension change
• game_mode — gamemode change
• entity_death — entity death (new)
• entity_kills — entity killed by player
• console_commands — commands executed on the console
• server_events — server start/stop
• Observation: some logs are recorded with the player as "SERVER" or "CONSOLE" when applicable (e.g., entity_death records in entity_death/SERVER/<date>.log).
Commands
Alias: essentialcore, ecore and core
• /ecore status — Shows mod status: queues, threads, latest backups, processing time, memory usage.
• /ecore inspect — Toggles inspector mode: toggleInspect.
* Subcommands (while in /nc inspect mode):
* /ecore inspect block <x> <y> <z> [page] — Inspects the block's history (actions + interactions).
* /ecore inspect player <target> [page] — Player's action history.
• /ecore player <player> — Displays the player's last backups.
• /ecore chunk — Shows information about the current chunk (last backup, last players to enter, etc.).
• /ecore backup all | player | chunks — Forces a backup.
• /ecore rollback chunk <radius> <backup_number> — Restores the chunks in an area around the player to the state of the indicated backup number.
• /ecore rollback player <player> <backup_number> — Restores the player's inventory (player must be online).
• /ecore inventory — Open the inventory of an online or offline player.
• /ecore enderchest — Open the enderchest from an online or offline player.
• /ecore reload — Reloads the config.toml configuration.
• /ecore pause — Pause Mod.
Future updates
• MySQL support
• Curios inventory support
Mod inspired by coreprotect!
Need help? Access Discord.
https://discord.gg/Uwv9cvFArS
Use Discord to report bugs and problems.
The source code will be provided if the mod is well-received, thank you.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21.1, 1.21
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
File checked by MCModsHub
- Ships as EssentialCore-26.1.2-6.0.0.jar — drop this file into the mods folder
- Download size: 135 KB
- Download link checked 23 Oct 2026 — working
These come from our own check of the pack file, not from the source page.