diff --git a/packages/builder/src/builder.js b/packages/builder/src/builder.js
index 561e15d9a9..04ea198a79 100644
--- a/packages/builder/src/builder.js
+++ b/packages/builder/src/builder.js
@@ -22,7 +22,9 @@ import {
   determineGlobals,
   stripWhitespace,
   isString,
-  isIndexFileAndFolder
+  isIndexFileAndFolder,
+  isPureObject,
+  clearRequireCache
 } from '@nuxt/utils'
 
 import Ignore from './ignore'
@@ -30,7 +32,6 @@ import BuildContext from './context/build'
 import TemplateContext from './context/template'
 
 const glob = pify(Glob)
-
 export default class Builder {
   constructor(nuxt, bundleBuilder) {
     this.nuxt = nuxt
@@ -616,10 +617,12 @@ export default class Builder {
 
     let patterns = [
       r(src, this.options.dir.layouts),
-      r(src, this.options.dir.store),
       r(src, this.options.dir.middleware),
       ...rGlob(this.options.dir.layouts)
     ]
+    if (this.options.store) {
+      patterns.push(r(src, this.options.dir.store))
+    }
 
     if (this._nuxtPages) {
       patterns.push(
@@ -648,10 +651,25 @@ export default class Builder {
     this.createFileWatcher(customPatterns, ['change'], refreshFiles, this.assignWatcher('custom'))
   }
 
+  getServerMiddlewarePaths() {
+    return this.options.serverMiddleware
+      .map((serverMiddleware) => {
+        if (isString(serverMiddleware)) {
+          return serverMiddleware
+        }
+        if (isPureObject(serverMiddleware) && isString(serverMiddleware.handler)) {
+          return serverMiddleware.handler
+        }
+      })
+      .filter(Boolean)
+      .map(p => path.extname(p) ? p : this.nuxt.resolver.resolvePath(p))
+  }
+
   watchRestart() {
+    const serverMiddlewarePaths = this.getServerMiddlewarePaths()
     const nuxtRestartWatch = [
       // Server middleware
-      ...this.options.serverMiddleware.filter(isString),
+      ...serverMiddlewarePaths,
       // Custom watchers
       ...this.options.watch
     ].map(this.nuxt.resolver.resolveAlias)
@@ -659,6 +677,10 @@ export default class Builder {
     if (this.ignore.ignoreFile) {
       nuxtRestartWatch.push(this.ignore.ignoreFile)
     }
+    // If store not activated, watch for a file in the directory
+    if (!this.options.store) {
+      nuxtRestartWatch.push(path.join(this.options.srcDir, this.options.dir.store))
+    }
 
     this.createFileWatcher(
       nuxtRestartWatch,
@@ -667,6 +689,11 @@ export default class Builder {
         if (['add', 'change', 'unlink'].includes(event) === false) {
           return
         }
+        /* istanbul ignore if */
+        if (serverMiddlewarePaths.includes(fileName)) {
+          consola.debug(`Clear cache for ${fileName}`)
+          clearRequireCache(fileName)
+        }
         await this.nuxt.callHook('watch:fileChanged', this, fileName) // Legacy
         await this.nuxt.callHook('watch:restart', { event, path: fileName })
       },
diff --git a/packages/builder/test/__utils__/index.js b/packages/builder/test/__utils__/index.js
index 054ce5eeda..70888b8267 100644
--- a/packages/builder/test/__utils__/index.js
+++ b/packages/builder/test/__utils__/index.js
@@ -10,6 +10,7 @@ export const createNuxt = () => ({
   callHook: jest.fn(),
   resolver: {
     requireModule: jest.fn(() => ({ template: 'builder-template' })),
-    resolveAlias: jest.fn(src => `resolveAlias(${src})`)
+    resolveAlias: jest.fn(src => `resolveAlias(${src})`),
+    resolvePath: jest.fn(src => `resolvePath(${src})`)
   }
 })
diff --git a/packages/builder/test/builder.watch.test.js b/packages/builder/test/builder.watch.test.js
index ab9e2dd5b3..7e2fbd2639 100644
--- a/packages/builder/test/builder.watch.test.js
+++ b/packages/builder/test/builder.watch.test.js
@@ -1,7 +1,8 @@
+import path from 'path'
 import chokidar from 'chokidar'
 import upath from 'upath'
 import debounce from 'lodash/debounce'
-import { r, isString } from '@nuxt/utils'
+import { r, isString, isPureObject } from '@nuxt/utils'
 
 import Builder from '../src/builder'
 import { createNuxt } from './__utils__'
@@ -41,31 +42,51 @@ describe('builder: builder watch', () => {
 
     const patterns = [
       '/var/nuxt/src/layouts',
-      '/var/nuxt/src/store',
       '/var/nuxt/src/middleware',
       '/var/nuxt/src/layouts/*.{vue,js,ts,tsx}',
       '/var/nuxt/src/layouts/**/*.{vue,js,ts,tsx}'
     ]
 
-    expect(r).toBeCalledTimes(5)
+    expect(r).toBeCalledTimes(4)
     expect(r).nthCalledWith(1, '/var/nuxt/src', '/var/nuxt/src/layouts')
-    expect(r).nthCalledWith(2, '/var/nuxt/src', '/var/nuxt/src/store')
-    expect(r).nthCalledWith(3, '/var/nuxt/src', '/var/nuxt/src/middleware')
-    expect(r).nthCalledWith(4, '/var/nuxt/src', '/var/nuxt/src/layouts/*.{vue,js,ts,tsx}')
-    expect(r).nthCalledWith(5, '/var/nuxt/src', '/var/nuxt/src/layouts/**/*.{vue,js,ts,tsx}')
+    expect(r).nthCalledWith(2, '/var/nuxt/src', '/var/nuxt/src/middleware')
+    expect(r).nthCalledWith(3, '/var/nuxt/src', '/var/nuxt/src/layouts/*.{vue,js,ts,tsx}')
+    expect(r).nthCalledWith(4, '/var/nuxt/src', '/var/nuxt/src/layouts/**/*.{vue,js,ts,tsx}')
 
-    expect(upath.normalizeSafe).toBeCalledTimes(5)
+    expect(upath.normalizeSafe).toBeCalledTimes(4)
     expect(upath.normalizeSafe).nthCalledWith(1, '/var/nuxt/src/layouts', 0, patterns)
-    expect(upath.normalizeSafe).nthCalledWith(2, '/var/nuxt/src/store', 1, patterns)
-    expect(upath.normalizeSafe).nthCalledWith(3, '/var/nuxt/src/middleware', 2, patterns)
-    expect(upath.normalizeSafe).nthCalledWith(4, '/var/nuxt/src/layouts/*.{vue,js,ts,tsx}', 3, patterns)
-    expect(upath.normalizeSafe).nthCalledWith(5, '/var/nuxt/src/layouts/**/*.{vue,js,ts,tsx}', 4, patterns)
+    expect(upath.normalizeSafe).nthCalledWith(2, '/var/nuxt/src/middleware', 1, patterns)
+    expect(upath.normalizeSafe).nthCalledWith(3, '/var/nuxt/src/layouts/*.{vue,js,ts,tsx}', 2, patterns)
+    expect(upath.normalizeSafe).nthCalledWith(4, '/var/nuxt/src/layouts/**/*.{vue,js,ts,tsx}', 3, patterns)
 
     expect(builder.createFileWatcher).toBeCalledTimes(1)
     expect(builder.createFileWatcher).toBeCalledWith(patterns, ['add', 'unlink'], expect.any(Function), expect.any(Function))
     expect(builder.assignWatcher).toBeCalledTimes(1)
   })
 
+  test('should watch store files', () => {
+    const nuxt = createNuxt()
+    nuxt.options.store = true
+    nuxt.options.srcDir = '/var/nuxt/src'
+    nuxt.options.dir = {
+      layouts: '/var/nuxt/src/layouts',
+      pages: '/var/nuxt/src/pages',
+      store: '/var/nuxt/src/store',
+      middleware: '/var/nuxt/src/middleware'
+    }
+    nuxt.options.build.watch = []
+
+    const builder = new Builder(nuxt, {})
+    builder.createFileWatcher = jest.fn()
+    builder.assignWatcher = jest.fn(() => () => {})
+    r.mockImplementation((dir, src) => src)
+
+    builder.watchClient()
+
+    expect(r).toBeCalledTimes(5)
+    expect(r).nthCalledWith(5, '/var/nuxt/src', '/var/nuxt/src/store')
+  })
+
   test('should watch pages files', () => {
     const nuxt = createNuxt()
     nuxt.options.srcDir = '/var/nuxt/src'
@@ -86,10 +107,10 @@ describe('builder: builder watch', () => {
 
     builder.watchClient()
 
-    expect(r).toBeCalledTimes(8)
-    expect(r).nthCalledWith(6, '/var/nuxt/src', '/var/nuxt/src/pages')
-    expect(r).nthCalledWith(7, '/var/nuxt/src', '/var/nuxt/src/pages/*.{vue,js,ts,tsx}')
-    expect(r).nthCalledWith(8, '/var/nuxt/src', '/var/nuxt/src/pages/**/*.{vue,js,ts,tsx}')
+    expect(r).toBeCalledTimes(7)
+    expect(r).nthCalledWith(5, '/var/nuxt/src', '/var/nuxt/src/pages')
+    expect(r).nthCalledWith(6, '/var/nuxt/src', '/var/nuxt/src/pages/*.{vue,js,ts,tsx}')
+    expect(r).nthCalledWith(7, '/var/nuxt/src', '/var/nuxt/src/pages/**/*.{vue,js,ts,tsx}')
   })
 
   test('should invoke generateRoutesAndFiles on file refresh', () => {
@@ -215,6 +236,13 @@ describe('builder: builder watch', () => {
 
   test('should watch files for restarting server', () => {
     const nuxt = createNuxt()
+    nuxt.options.srcDir = '/var/nuxt/src'
+    nuxt.options.dir = {
+      layouts: '/var/nuxt/src/layouts',
+      pages: '/var/nuxt/src/pages',
+      store: '/var/nuxt/src/store',
+      middleware: '/var/nuxt/src/middleware'
+    }
     nuxt.options.watchers = {
       chokidar: { test: true }
     }
@@ -222,21 +250,25 @@ describe('builder: builder watch', () => {
       '/var/nuxt/src/watch/test'
     ]
     nuxt.options.serverMiddleware = [
-      '/var/nuxt/src/middleware/test',
+      '/var/nuxt/src/serverMiddleware/test',
+      { path: '/test', handler: '/var/nuxt/src/serverMiddleware/test-handler' },
       { obj: 'test' }
     ]
     const builder = new Builder(nuxt, {})
     builder.ignore.ignoreFile = '/var/nuxt/src/.nuxtignore'
-    isString.mockImplementationOnce(src => typeof src === 'string')
+    isString.mockImplementation(src => typeof src === 'string')
+    isPureObject.mockImplementation(obj => typeof obj === 'object')
 
     builder.watchRestart()
 
     expect(chokidar.watch).toBeCalledTimes(1)
     expect(chokidar.watch).toBeCalledWith(
       [
-        'resolveAlias(/var/nuxt/src/middleware/test)',
+        'resolveAlias(resolvePath(/var/nuxt/src/serverMiddleware/test))',
+        'resolveAlias(resolvePath(/var/nuxt/src/serverMiddleware/test-handler))',
         'resolveAlias(/var/nuxt/src/watch/test)',
-        '/var/nuxt/src/.nuxtignore'
+        '/var/nuxt/src/.nuxtignore',
+        path.join('/var/nuxt/src/var/nuxt/src/store') // because store == false + using path.join()
       ],
       { test: true }
     )
@@ -246,6 +278,13 @@ describe('builder: builder watch', () => {
 
   test('should trigger restarting when files changed', async () => {
     const nuxt = createNuxt()
+    nuxt.options.srcDir = '/var/nuxt/src'
+    nuxt.options.dir = {
+      layouts: '/var/nuxt/src/layouts',
+      pages: '/var/nuxt/src/pages',
+      store: '/var/nuxt/src/store',
+      middleware: '/var/nuxt/src/middleware'
+    }
     nuxt.options.watchers = {
       chokidar: { test: true }
     }
@@ -274,6 +313,13 @@ describe('builder: builder watch', () => {
 
   test('should ignore other events in watchRestart', () => {
     const nuxt = createNuxt()
+    nuxt.options.srcDir = '/var/nuxt/src'
+    nuxt.options.dir = {
+      layouts: '/var/nuxt/src/layouts',
+      pages: '/var/nuxt/src/pages',
+      store: '/var/nuxt/src/store',
+      middleware: '/var/nuxt/src/middleware'
+    }
     nuxt.options.watchers = {
       chokidar: { test: true }
     }
diff --git a/packages/cli/src/commands/dev.js b/packages/cli/src/commands/dev.js
index 8348c72f1a..7415a1750e 100644
--- a/packages/cli/src/commands/dev.js
+++ b/packages/cli/src/commands/dev.js
@@ -41,7 +41,7 @@ export default {
     const nuxt = await cmd.getNuxt(config)
 
     // Setup hooks
-    nuxt.hook('watch:restart', payload => this.onWatchRestart(payload, { nuxt, builder, cmd, argv }))
+    nuxt.hook('watch:restart', payload => this.onWatchRestart(payload, { nuxt, cmd, argv }))
     nuxt.hook('bundler:change', changedFileName => this.onBundlerChange(changedFileName))
 
     // Wait for nuxt to be ready
diff --git a/packages/utils/src/lang.js b/packages/utils/src/lang.js
index a98f294ea3..6ce1507bee 100644
--- a/packages/utils/src/lang.js
+++ b/packages/utils/src/lang.js
@@ -6,9 +6,7 @@ export const isString = obj => typeof obj === 'string' || obj instanceof String
 
 export const isNonEmptyString = obj => Boolean(obj && isString(obj))
 
-export const isPureObject = function isPureObject(o) {
-  return !Array.isArray(o) && typeof o === 'object'
-}
+export const isPureObject = obj => !Array.isArray(obj) && typeof obj === 'object'
 
 export const isUrl = function isUrl(url) {
   return ['http', '//'].some(str => url.startsWith(str))