# JRSecurity \u2014 Secure, mod list verification
\nJRSecurity is a lightweight security stack consisting of a Fabric client mod and a Paper\/Spigot plugin. It securely transmits a player\u2019s installed mod list to supported servers using Minecraft\u2019s modern 1.20.5+ Custom Payload system, enabling fair\u2011play verification without invasive scanning or gameplay impact. <\/p>\n
**It requires Client Mod (Fabric) and Server Plugin (Spighot, Paper, Bukkit)!**<\/p>\n
## \ud83d\udda5\ufe0f Client (Fabric 1.20.5+)<\/p>\n
– The client sends your installed mod list to the server right after joining via the Mojang 1.20.5+ payload API. Transmission is robust and version\u2011safe, built to work alongside vanilla\u2011like networking.
\nFeatures<\/p>\n
– Sends a cleaned, canonical mod and resourcepack list after a successful join
\nUses the modern Mojang Custom Payload \/ PacketCodec (1.20.5+)
\nZero gameplay changes, low overhead
\nDesigned to interoperate with the JRSecurity server plugin<\/p>\n
### Compatibility<\/p>\n
Minecraft: 1.20.5 \u2013 1.21.x
\nLoader: Fabric
\nJava: 17+<\/p>\n
### Installation<\/p>\n
1. Install Fabric Loader + Fabric API
\n2. Drop JRSecurity (client mod) into your mods\/ folder
\n3. Join a server running the JRSecurity plugin\u2014your mod list is sent automatically<\/p>\n
##
\n## \ud83d\udda7 Server Plugin (Paper\/Spigot\/Bukkit)
\nThe plugin receives the client\u2019s mod list over a namespaced plugin messaging channel , cleans and validates it against your configurable blacklist, writes per\u2011join log files, and can deny access when forbidden mods are detected.
\nFeatures<\/p>\n
Blacklist enforcement via config.yml (exact IDs + substring contains); violators are kicked with a customizable message
\nPer\u2011join logs in plugins\/JRSecurity\/joinlogs\/\u2026 (cleaned, sorted lists)
\nSmart separation of \u201crelevant mods\u201d vs libraries\/APIs for clarity<\/p>\n
### **Commands**<\/p>\n
\/modcheck show [player] \u2013 show cleaned mod list (self or others; others require modcheck.admin)<\/p>\n
\/modcheck last [player] \u2013 show the path of the latest saved log file<\/p>\n
\/modcheck reload \u2013 reloads config.yml<\/p>\n
\/rpcheck show [player] \u2013 show cleaned mod list (self or others; others require modcheck.admin)<\/p>\n
\/rpcheck last [player] \u2013 show the path of the latest saved log file<\/p>\n
\/rpcheck reload \u2013 reloads config.yml<\/p>\n
Resilient to proxies (recognizes probes, has safe fallbacks)
\nNo NMS; wide version compatibility<\/p>\n
### Compatibility<\/p>\n
Servers: Paper\/Spigot\/Bukkit 1.13 \u2013 1.21.x
\nJava: 17+ recommended<\/p>\n
### Quick Setup<\/p>\n
Put the JRSecurity plugin jar into plugins\/ and start the server
\nAdjust plugins\/JRSecurity\/config.yml as needed<\/p>\n","protected":false},"excerpt":{"rendered":"
JRSecurity implements the modern Mojang 1.20.5+ Payload API to deliver a secure and authentic mod\u2011list handshake from client to server. Built for Paper,Spighot,Bukkit Server + Fabric Client that rely on mod compliance.<\/p>\n","protected":false},"featured_media":88539,"template":"","meta":{"_minecraft_slug":"jrsecurity","_minecraft_project_id":"mvyQOe2t","_minecraft_author":"Jaxroxn","_minecraft_license":"LicenseRef-All-Rights-Reserved","_minecraft_downloads":219,"_minecraft_follows":0,"_minecraft_client_side":"unsupported","_minecraft_server_side":"required","_minecraft_storage_type":"zip","_minecraft_archive_name":"jrsecurity.zip","_minecraft_size_bytes":603920,"_minecraft_version_count":4,"_minecraft_updated_at":"2026-05-16T12:29:49.524587Z","_minecraft_date_created":"2026-02-18T01:10:44.848920Z","_minecraft_date_modified":"2026-04-04T07:20:24.415550Z","_minecraft_project_url":"https:\/\/modrinth.com\/mod\/jrsecurity","_minecraft_icon_attachment_id":88539,"_minecraft_imported_at":"2026-06-05T01:27:42+00:00","_minecraft_import_hash":"89f7c86b5a70c55b65333250cfce11ea","_minecraft_versions":"","_minecraft_links":"","_minecraft_gallery":"","_minecraft_api_metadata":""},"mod_category":[124,97,126,127,129,123],"mod_loader":[130,99,132,134],"minecraft_version":[101,102,62,37,40,41,73,74,38,78,79,80,81,82,83,167],"class_list":["post-88538","mod","type-mod","status-publish","has-post-thumbnail","hentry","mod_category-bukkit","mod_category-fabric","mod_category-management","mod_category-paper","mod_category-spigot","mod_category-technology","mod_loader-bukkit","mod_loader-fabric","mod_loader-paper","mod_loader-spigot","minecraft_version-1-20-5","minecraft_version-1-20-6","minecraft_version-1-21","minecraft_version-1-21-1","minecraft_version-1-21-10","minecraft_version-1-21-11","minecraft_version-1-21-2","minecraft_version-1-21-3","minecraft_version-1-21-4","minecraft_version-1-21-5","minecraft_version-1-21-6","minecraft_version-1-21-7","minecraft_version-1-21-8","minecraft_version-1-21-9","minecraft_version-26-1","minecraft_version-26-1-1"],"yoast_head":"\n