Fabric Packet Logger
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Deep packet logging mod for Minecraft Fabric - captures all network traffic with full NBT/Component data
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Fabric is a mod loader for versions 1.14+ of Minecraft, particularly popular for client side and optimization mods.
Minecraft
26.2
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26.1
1.21.11
1.21.10
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1.21.8
1.21.7
1.21.6
1.21.5
1.21.4
1.21.3
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Where It Runs
Client Only
Runs entirely on the client. Works on vanilla servers.
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Project Details
Type
Mod
Latest Version
1.2.3+26.2
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About
Description
Fabric Package Logger
A deep packet logging mod for Minecraft Fabric that captures all network traffic (S2C and C2S) with full NBT/Component data.
Use Cases
- Mod Development: Debug network communication between client and server
- Container Inspection: View exact contents of inventories with full NBT/Component data and copying them
- Reverse Engineering: Analyze server-side mechanics and packet structures
- Anti-Cheat Analysis: Understand what data the server sends and receives
- Learning: Understand how Minecraft's network protocol works
Usage
Keybind
Press F6 to open the config screen.
Packet Selection
Use the dual-list selector to choose which packets to log:
- S2C (Server → Client): Incoming packets like inventory updates, entity spawns, etc.
- C2S (Client → Server): Outgoing packets like clicks, movements, etc.
Log Modes
- Chat: Display packets in the game chat (truncated for readability)
- File: Save packets to log files with full data
Log Files
Logs are saved to:
MINECRAFT_FOLDER/packet-logger/packets_2026-01-04_15-30-45_servername.log
A new log file is created when:
- Joining a world/server
- Re-enabling logging after it was disabled
Example Output
[12:34:56.789] [S2C] InventoryS2CPacket {syncId:2,revision:1,id:"minecraft:generic_9x3",components:{"minecraft:container":[{item:{id:"minecraft:diamond_sword",count:1,components:{"minecraft:enchantments":{levels:{"minecraft:sharpness":5}}}},slot:0}]}}
Available Packets
All packets are loaded dynamically from the game's PacketType registries and are selectable in the config screen's dual-list selector. Both S2C (Server → Client) and C2S (Client → Server) packets are covered across all protocol phases.
See for an example listing of all packets for Minecraft 1.21.4.
Click to expand (573 packets)
S2C (Server → Client)
Common
CommonPingS2CPacketCookieRequestS2CPacketCustomPayloadS2CPacketCustomReportDetailsS2CPacketDisconnectS2CPacketKeepAliveS2CPacketResourcePackRemoveS2CPacketResourcePackSendS2CPacketServerLinksS2CPacketServerTransferS2CPacketStoreCookieS2CPacketSynchronizeTagsS2CPacket
Config
DynamicRegistriesS2CPacketFeaturesS2CPacketReadyS2CPacketResetChatS2CPacketSelectKnownPacksS2CPacket
Custom
DebugBeeCustomPayloadBee
DebugBrainCustomPayloadBrain
DebugBreezeCustomPayloadBreezeInfo
DebugGameEventCustomPayloadDebugGameEventListenersCustomPayloadDebugGameTestAddMarkerCustomPayloadDebugGameTestClearCustomPayloadDebugGoalSelectorCustomPayloadGoal
DebugHiveCustomPayloadHiveInfo
DebugNeighborsUpdateCustomPayloadDebugPathCustomPayloadDebugPoiAddedCustomPayloadDebugPoiRemovedCustomPayloadDebugPoiTicketCountCustomPayloadDebugRaidsCustomPayloadDebugRedstoneUpdateOrderCustomPayloadWire
DebugStructuresCustomPayloadPiece
DebugVillageSectionsCustomPayloadDebugWorldgenAttemptCustomPayload
Login
LoginCompressionS2CPacketLoginDisconnectS2CPacketLoginHelloS2CPacketLoginQueryRequestS2CPacketLoginQueryRequestPayloadLoginSuccessS2CPacketUnknownLoginQueryRequestPayload
Play
AdvancementUpdateS2CPacketBlockBreakingProgressS2CPacketBlockEntityUpdateS2CPacketBlockEventS2CPacketBlockUpdateS2CPacketBossBarS2CPacketActionAddActionConsumerTypeUpdateNameActionUpdateProgressActionUpdatePropertiesActionUpdateStyleAction
BundleDelimiterS2CPacketBundleS2CPacketChatMessageS2CPacketChatSuggestionsS2CPacketAction
ChunkBiomeDataS2CPacketSerialized
ChunkDataS2CPacketBlockEntityDataBlockEntityVisitor
ChunkDeltaUpdateS2CPacketChunkLoadDistanceS2CPacketChunkRenderDistanceCenterS2CPacketChunkSentS2CPacketClearTitleS2CPacketCloseScreenS2CPacketCommandSuggestionsS2CPacketSuggestion
CommandTreeS2CPacketArgumentNodeCommandNodeDataCommandTreeLiteralNodeSuggestableNode
CommonPlayerSpawnInfoCooldownUpdateS2CPacketCraftFailedResponseS2CPacketDamageTiltS2CPacketDeathMessageS2CPacketDebugSampleS2CPacketDifficultyS2CPacketEndCombatS2CPacketEnterCombatS2CPacketEnterReconfigurationS2CPacketEntitiesDestroyS2CPacketEntityAnimationS2CPacketEntityAttachS2CPacketEntityAttributesS2CPacketEntry
EntityDamageS2CPacketEntityEquipmentUpdateS2CPacketEntityPassengersSetS2CPacketEntityPositionS2CPacketEntityPositionSyncS2CPacketEntityS2CPacketMoveRelativeRotateRotateAndMoveRelative
EntitySetHeadYawS2CPacketEntitySpawnS2CPacketEntityStatusEffectS2CPacketEntityStatusS2CPacketEntityTrackerUpdateS2CPacketEntityVelocityUpdateS2CPacketExperienceBarUpdateS2CPacketExperienceOrbSpawnS2CPacketExplosionS2CPacketGameJoinS2CPacketGameMessageS2CPacketGameStateChangeS2CPacketReason
HealthUpdateS2CPacketInventoryS2CPacketItemPickupAnimationS2CPacketLightUpdateS2CPacketLookAtS2CPacketMapUpdateS2CPacketMoveMinecartAlongTrackS2CPacketNbtQueryResponseS2CPacketOpenHorseScreenS2CPacketOpenScreenS2CPacketOpenWrittenBookS2CPacketOverlayMessageS2CPacketParticleS2CPacketPlayerAbilitiesS2CPacketPlayerActionResponseS2CPacketPlayerListHeaderS2CPacketPlayerListS2CPacketActionEntrySerialized
PlayerPositionLookS2CPacketPlayerRemoveS2CPacketPlayerRespawnS2CPacketPlayerRotationS2CPacketPlayerSpawnPositionS2CPacketPlaySoundFromEntityS2CPacketPlaySoundS2CPacketProfilelessChatMessageS2CPacketProjectilePowerS2CPacketRecipeBookAddS2CPacketEntry
RecipeBookRemoveS2CPacketRecipeBookSettingsS2CPacketRemoveEntityStatusEffectS2CPacketRemoveMessageS2CPacketScoreboardDisplayS2CPacketScoreboardObjectiveUpdateS2CPacketScoreboardScoreResetS2CPacketScoreboardScoreUpdateS2CPacketScreenHandlerPropertyUpdateS2CPacketScreenHandlerSlotUpdateS2CPacketSelectAdvancementTabS2CPacketServerMetadataS2CPacketSetCameraEntityS2CPacketSetCursorItemS2CPacketSetPlayerInventoryS2CPacketSetTradeOffersS2CPacketSignEditorOpenS2CPacketSimulationDistanceS2CPacketStartChunkSendS2CPacketStatisticsS2CPacketStopSoundS2CPacketSubtitleS2CPacketSynchronizeRecipesS2CPacketTeamS2CPacketOperationSerializableTeam
TickStepS2CPacketTitleFadeS2CPacketTitleS2CPacketUnloadChunkS2CPacketUpdateSelectedSlotS2CPacketUpdateTickRateS2CPacketVehicleMoveS2CPacketWorldBorderCenterChangedS2CPacketWorldBorderInitializeS2CPacketWorldBorderInterpolateSizeS2CPacketWorldBorderSizeChangedS2CPacketWorldBorderWarningBlocksChangedS2CPacketWorldBorderWarningTimeChangedS2CPacketWorldEventS2CPacketWorldTimeUpdateS2CPacket
Query
PingResultS2CPacketQueryResponseS2CPacket
C2S (Client → Server)
Common
ClientOptionsC2SPacketCommonPongC2SPacketCookieResponseC2SPacketCustomPayloadC2SPacketKeepAliveC2SPacketResourcePackStatusC2SPacketStatus
SyncedClientOptions
Config
ReadyC2SPacketSelectKnownPacksC2SPacket
Handshake
HandshakeC2SPacketConnectionIntent
Login
EnterConfigurationC2SPacketLoginHelloC2SPacketLoginKeyC2SPacketLoginQueryResponseC2SPacketLoginQueryResponsePayloadUnknownLoginQueryResponsePayload
Play
AcknowledgeChunksC2SPacketAcknowledgeReconfigurationC2SPacketAdvancementTabC2SPacketAction
BoatPaddleStateC2SPacketBookUpdateC2SPacketBundleItemSelectedC2SPacketButtonClickC2SPacketChatCommandSignedC2SPacketChatMessageC2SPacketClickSlotC2SPacketClientCommandC2SPacketMode
ClientStatusC2SPacketMode
ClientTickEndC2SPacketCloseHandledScreenC2SPacketCommandExecutionC2SPacketCraftRequestC2SPacketCreativeInventoryActionC2SPacketDebugSampleSubscriptionC2SPacketHandSwingC2SPacketJigsawGeneratingC2SPacketMessageAcknowledgmentC2SPacketPickItemFromBlockC2SPacketPickItemFromEntityC2SPacketPlayerActionC2SPacketAction
PlayerInputC2SPacketPlayerInteractBlockC2SPacketPlayerInteractEntityC2SPacketHandlerInteractAtHandlerInteractHandlerInteractTypeInteractTypeHandler
PlayerInteractItemC2SPacketPlayerLoadedC2SPacketPlayerMoveC2SPacketFullLookAndOnGroundOnGroundOnlyPositionAndOnGround
PlayerSessionC2SPacketQueryBlockNbtC2SPacketQueryEntityNbtC2SPacketRecipeBookDataC2SPacketRecipeCategoryOptionsC2SPacketRenameItemC2SPacketRequestCommandCompletionsC2SPacketSelectMerchantTradeC2SPacketSlotChangedStateC2SPacketSpectatorTeleportC2SPacketTeleportConfirmC2SPacketUpdateBeaconC2SPacketUpdateCommandBlockC2SPacketUpdateCommandBlockMinecartC2SPacketUpdateDifficultyC2SPacketUpdateDifficultyLockC2SPacketUpdateJigsawC2SPacketUpdatePlayerAbilitiesC2SPacketUpdateSelectedSlotC2SPacketUpdateSignC2SPacketUpdateStructureBlockC2SPacketVehicleMoveC2SPacket
Query
QueryPingC2SPacketQueryRequestC2SPacket
License
This project is licensed under the GNU General Public License v3.0.
Credits
- Fabric API Team
- Minecraft Modding Community
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Settings GUI -
Example chat output -
Example chat output -
Example log output
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On ModDex
Community snapshot
0
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0
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0
In stacks
By the numbers
Statistics
~2,000
Downloads
Created
Last synced
When ModDex last fetched this project from CurseForge or Modrinth. Every project is re-checked on a schedule, and any project that ships a new file is synced automatically within hours of the release.
When ModDex last fetched this project from CurseForge or Modrinth. Every project is re-checked on a schedule, and any project that ships a new file is synced automatically within hours of the release.
New file updates sync automatically
How syncing works
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Discord