diff --git a/src/components/widgets/filesystem/FileSystemGoToFileDialog.vue b/src/components/widgets/filesystem/FileSystemGoToFileDialog.vue
index f92c0d55c6..d477c00d2e 100644
--- a/src/components/widgets/filesystem/FileSystemGoToFileDialog.vue
+++ b/src/components/widgets/filesystem/FileSystemGoToFileDialog.vue
@@ -65,7 +65,7 @@ export default class FileSystemGoToFileDialog extends Mixins(StateMixin) {
   search = ''
   loaded = false
 
-  get rootFiles (): Moonraker.Files.RootFile[] | undefined {
+  get rootFiles (): readonly Moonraker.Files.RootFile[] | undefined {
     return this.$typedGetters['files/getRootFiles'](this.root)
   }
 
diff --git a/src/store/console/mutations.ts b/src/store/console/mutations.ts
index 400e40b78d..5e28d1eba0 100644
--- a/src/store/console/mutations.ts
+++ b/src/store/console/mutations.ts
@@ -75,7 +75,7 @@ export const mutations = {
    * Defines the list of available commands
    */
   setGcodeHelp (state, payload: Moonraker.KlippyApis.GcodeHelpResponse) {
-    state.gcodeHelp = payload
+    state.gcodeHelp = Object.freeze(payload)
   },
 
   /**
diff --git a/src/store/console/types.ts b/src/store/console/types.ts
index 2eddc92581..e433e2a2d7 100644
--- a/src/store/console/types.ts
+++ b/src/store/console/types.ts
@@ -1,9 +1,8 @@
 export interface ConsoleState {
-  // [key: string]: string;
   consoleCommand: string;
   consoleSearch: string;
-  console: ConsoleEntry[]; // console stream
-  gcodeHelp: Moonraker.KlippyApis.GcodeHelpResponse; // known commands
+  console: Readonly<ConsoleEntry>[]; // console stream
+  gcodeHelp: Readonly<Moonraker.KlippyApis.GcodeHelpResponse>; // known commands
   consoleEntryCount: number; // give each console entry a unique id.
   commandHistory: string[];
   autoScroll: boolean;
diff --git a/src/store/files/mutations.ts b/src/store/files/mutations.ts
index d966e69ecd..7d115de0fb 100644
--- a/src/store/files/mutations.ts
+++ b/src/store/files/mutations.ts
@@ -28,17 +28,25 @@ export const mutations = {
   setServerFilesGetDirectory (state, payload: { path: string, content: MoonrakerPathContent }) {
     const { path, content } = payload
 
-    Vue.set(state.pathContent, path, content)
+    const pathContent: MoonrakerPathContent = {
+      ...content,
+      files: content.files
+        .map(file => Object.freeze(file)),
+      dirs: content.dirs
+        .map(dir => Object.freeze(dir))
+    }
+
+    Vue.set(state.pathContent, path, pathContent)
   },
 
   setServerFilesRoots (state, payload: Moonraker.Files.RootInfoWithPath[]) {
-    state.roots = payload
+    state.roots = Object.freeze(payload)
   },
 
   setServerFilesListRoot (state, payload: { root: string, files: Moonraker.Files.RootFile[] }) {
     const { root, files } = payload
 
-    Vue.set(state.rootFiles, root, files)
+    Vue.set(state.rootFiles, root, Object.freeze(files))
   },
 
   setFileUpdate (state, payload: { paths: FilePaths, file: Moonraker.Files.File | Moonraker.Files.FileWithMeta }) {
@@ -57,14 +65,14 @@ export const mutations = {
         const fileIndex = directory.files.findIndex(file => file.filename === paths.filename)
 
         if (fileIndex >= 0) {
-          Vue.set(directory.files, fileIndex, file)
+          Vue.set(directory.files, fileIndex, Object.freeze(file))
         } else {
-          directory.files.push(file)
+          directory.files.push(Object.freeze(file))
         }
       } else {
         const directory: MoonrakerPathContent = {
           partial: true,
-          files: [file],
+          files: [Object.freeze(file)],
           dirs: []
         }
 
@@ -89,9 +97,9 @@ export const mutations = {
         const dirIndex = directory.dirs.findIndex(dir => dir.dirname === paths.filename)
 
         if (dirIndex >= 0) {
-          Vue.set(directory.dirs, dirIndex, dir)
+          Vue.set(directory.dirs, dirIndex, Object.freeze(dir))
         } else {
-          directory.dirs.push(dir)
+          directory.dirs.push(Object.freeze(dir))
         }
       }
     }
@@ -179,6 +187,6 @@ export const mutations = {
   },
 
   setDiskUsage (state, payload: { root: string, disk_usage: Moonraker.Files.DiskUsage }) {
-    Vue.set(state.diskUsage, payload.root, payload.disk_usage)
+    Vue.set(state.diskUsage, payload.root, Object.freeze(payload.disk_usage))
   }
 } satisfies MutationTree<FilesState>
diff --git a/src/store/files/types.ts b/src/store/files/types.ts
index 8d14c3a63d..eb1b3f16ef 100644
--- a/src/store/files/types.ts
+++ b/src/store/files/types.ts
@@ -6,10 +6,10 @@ export type { AppFileMeta }
 export interface FilesState {
   uploads: FileUpload[];
   download: FileDownload | null;
-  roots: Moonraker.Files.RootInfoWithPath[] | null;
+  roots: readonly Moonraker.Files.RootInfoWithPath[] | null;
   currentPaths: Record<string, string | undefined>;
-  diskUsage: Record<string, Moonraker.Files.DiskUsage | undefined>;
-  rootFiles: Record<string, Moonraker.Files.RootFile[] | undefined>;
+  diskUsage: Record<string, Readonly<Moonraker.Files.DiskUsage> | undefined>;
+  rootFiles: Record<string, readonly Moonraker.Files.RootFile[] | undefined>;
   pathContent: Record<string, MoonrakerPathContent | undefined>;
 }
 
@@ -20,8 +20,8 @@ export interface AppDiskUsage extends Moonraker.Files.DiskUsage {
 
 export interface MoonrakerPathContent {
   partial?: boolean;
-  files: (Moonraker.Files.File | Moonraker.Files.FileWithMeta)[];
-  dirs: Moonraker.Files.Dir[];
+  files: (Readonly<Moonraker.Files.File> | Readonly<Moonraker.Files.FileWithMeta>)[];
+  dirs: Readonly<Moonraker.Files.Dir>[];
 }
 
 export interface AppFile extends Moonraker.Files.File, Pick<Moonraker.Files.Metadata, 'thumbnails'> {
diff --git a/src/store/history/mutations.ts b/src/store/history/mutations.ts
index 1ebab8b486..bddd3d1199 100644
--- a/src/store/history/mutations.ts
+++ b/src/store/history/mutations.ts
@@ -24,6 +24,7 @@ export const mutations = {
   setHistoryList (state, payload: Moonraker.History.ListResponse) {
     if (payload.jobs != null) {
       state.jobs = payload.jobs
+        .map(job => Object.freeze(job))
     }
     if (payload.count != null) {
       state.count = payload.count
@@ -35,7 +36,7 @@ export const mutations = {
    */
   setAddHistory (state, payload: Moonraker.History.Job) {
     if (payload) {
-      state.jobs.push(payload)
+      state.jobs.push(Object.freeze(payload))
       state.count++
     }
   },
@@ -47,7 +48,7 @@ export const mutations = {
     if (payload) {
       const i = state.jobs.findIndex(job => job.job_id === payload.job_id)
       if (i >= 0) {
-        Vue.set(state.jobs, i, payload)
+        Vue.set(state.jobs, i, Object.freeze(payload))
       }
     }
   },
@@ -57,13 +58,13 @@ export const mutations = {
       const i = state.jobs.findIndex(job => job.job_id === payload)
       if (i >= 0) {
         const job = state.jobs[i]
-        Vue.set(state.jobs, i, {
+        Vue.set(state.jobs, i, Object.freeze({
           ...job,
           metadata: {
             ...job.metadata,
             thumbnails: []
           }
-        })
+        }))
       }
     }
   },
diff --git a/src/store/history/types.ts b/src/store/history/types.ts
index 10341984b3..f3830ce9e7 100644
--- a/src/store/history/types.ts
+++ b/src/store/history/types.ts
@@ -2,7 +2,7 @@ import type { AppFileMeta } from '@/store/files/types.metadata'
 
 export interface HistoryState {
   count: number;
-  jobs: Moonraker.History.Job[];
+  jobs: Readonly<Moonraker.History.Job>[];
   job_totals: Moonraker.History.JobTotals;
 }
 
diff --git a/src/store/jobQueue/mutations.ts b/src/store/jobQueue/mutations.ts
index b1f94fc328..649cfa540a 100644
--- a/src/store/jobQueue/mutations.ts
+++ b/src/store/jobQueue/mutations.ts
@@ -12,6 +12,6 @@ export const mutations = {
   },
 
   setQueuedJobs (state, payload: Moonraker.JobQueue.QueuedJob[]) {
-    state.queuedJobs = payload || []
+    state.queuedJobs = Object.freeze(payload || [])
   }
 } satisfies MutationTree<JobQueueState>
diff --git a/src/store/jobQueue/types.ts b/src/store/jobQueue/types.ts
index 33582822bf..ca50451458 100644
--- a/src/store/jobQueue/types.ts
+++ b/src/store/jobQueue/types.ts
@@ -2,7 +2,7 @@ import type { AppFile, AppFileWithMeta } from '@/store/files/types'
 
 export interface JobQueueState {
   queueState: Moonraker.JobQueue.QueueState;
-  queuedJobs: Moonraker.JobQueue.QueuedJob[];
+  queuedJobs: readonly Moonraker.JobQueue.QueuedJob[];
 }
 
 export interface QueuedJobWithAppFile extends Moonraker.JobQueue.QueuedJob {
diff --git a/src/store/spoolman/mutations.ts b/src/store/spoolman/mutations.ts
index b712f417ed..b50858c6f8 100644
--- a/src/store/spoolman/mutations.ts
+++ b/src/store/spoolman/mutations.ts
@@ -20,7 +20,7 @@ export const mutations = {
   },
 
   setSpools (state, payload: Moonraker.Spoolman.Spool[]) {
-    state.spools = payload
+    state.spools = Object.freeze(payload)
   },
 
   setDialogState (state, payload: SpoolSelectionDialogState) {
@@ -28,7 +28,7 @@ export const mutations = {
   },
 
   setInfo (state, payload: Moonraker.Spoolman.Info) {
-    state.info = payload
+    state.info = Object.freeze(payload)
   },
 
   setCurrency (state, payload: Moonraker.Spoolman.Currency) {
diff --git a/src/store/spoolman/types.ts b/src/store/spoolman/types.ts
index 1ffb1bb563..96344bfb44 100644
--- a/src/store/spoolman/types.ts
+++ b/src/store/spoolman/types.ts
@@ -1,6 +1,6 @@
 export interface SpoolmanState {
-  info: Moonraker.Spoolman.Info | null;
-  spools: Moonraker.Spoolman.Spool[];
+  info: Readonly<Moonraker.Spoolman.Info> | null;
+  spools: readonly Moonraker.Spoolman.Spool[];
   activeSpool: number | null;
   currency: string | null;
   connected: boolean;
diff --git a/src/typings/moonraker.spoolman.d.ts b/src/typings/moonraker.spoolman.d.ts
index 9ac779daaf..a96c7aed15 100644
--- a/src/typings/moonraker.spoolman.d.ts
+++ b/src/typings/moonraker.spoolman.d.ts
@@ -57,6 +57,10 @@ declare namespace Moonraker.Spoolman {
     extra?: Record<string, unknown>;
   }
 
+  export type FilamentMultiColorDirection =
+    | 'coaxial'
+    | 'longitudinal'
+
   export interface Filament {
     id: number;
     registered: string;
@@ -75,7 +79,7 @@ declare namespace Moonraker.Spoolman {
     settings_bed_temp?: number;
     color_hex?: string;
     multi_color_hexes?: string;
-    multi_color_direction?: string;
+    multi_color_direction?: FilamentMultiColorDirection;
     external_id?: string;
     extra?: Record<string, unknown>;
   }