diff --git a/components/DetailBar.tsx b/components/DetailBar.tsx
index d6c33fc..f33d730 100644
--- a/components/DetailBar.tsx
+++ b/components/DetailBar.tsx
@@ -1,4 +1,4 @@
-import { MonitorState, MonitorTarget } from '@/uptime.types'
+import { MonitorState, MonitorTarget } from '@/types/uptime.types'
 import { getColor } from '@/util/color'
 import { Box, Tooltip, Modal } from '@mantine/core'
 import { useResizeObserver } from '@mantine/hooks'
@@ -50,13 +50,20 @@ export default function DetailBar({
       if (overlap > 0) {
         for (let i = 0; i < incident.error.length; i++) {
           let partStart = incident.start[i]
-          let partEnd = i === incident.error.length - 1 ? (incident.end ?? currentTime) : incident.start[i + 1]
+          let partEnd =
+            i === incident.error.length - 1 ? incident.end ?? currentTime : incident.start[i + 1]
           partStart = Math.max(partStart, dayStart)
           partEnd = Math.min(partEnd, dayEnd)
 
           if (overlapLen(dayStart, dayEnd, partStart, partEnd) > 0) {
-            const startStr = new Date(partStart * 1000).toLocaleTimeString([], {hour: '2-digit', minute:'2-digit'})
-            const endStr = new Date(partEnd * 1000).toLocaleTimeString([], {hour: '2-digit', minute:'2-digit'})
+            const startStr = new Date(partStart * 1000).toLocaleTimeString([], {
+              hour: '2-digit',
+              minute: '2-digit',
+            })
+            const endStr = new Date(partEnd * 1000).toLocaleTimeString([], {
+              hour: '2-digit',
+              minute: '2-digit',
+            })
             incidentReasons.push(`[${startStr}-${endStr}] ${incident.error[i]}`)
           }
         }
@@ -77,7 +84,10 @@ export default function DetailBar({
             <>
               <div>{dayPercent + '% at ' + new Date(dayStart * 1000).toLocaleDateString()}</div>
               {dayDownTime > 0 && (
-                <div>{`Down for ${moment.preciseDiff(moment(0), moment(dayDownTime * 1000))} (click for detail)`}</div>
+                <div>{`Down for ${moment.preciseDiff(
+                  moment(0),
+                  moment(dayDownTime * 1000)
+                )} (click for detail)`}</div>
               )}
             </>
           )
@@ -94,10 +104,14 @@ export default function DetailBar({
           }}
           onClick={() => {
             if (dayDownTime > 0) {
-              setModalTitle(`🚨 ${monitor.name} incidents at ${new Date(dayStart * 1000).toLocaleDateString()}`)
+              setModalTitle(
+                `🚨 ${monitor.name} incidents at ${new Date(dayStart * 1000).toLocaleDateString()}`
+              )
               setModelContent(
                 <>
-                  {incidentReasons.map((reason, index) => (<div key={index}>{reason}</div>))}
+                  {incidentReasons.map((reason, index) => (
+                    <div key={index}>{reason}</div>
+                  ))}
                 </>
               )
               setModalOpened(true)
@@ -110,7 +124,12 @@ export default function DetailBar({
 
   return (
     <>
-      <Modal opened={modalOpened} onClose={() => setModalOpened(false)} title={modalTitle} size={'40em'}>
+      <Modal
+        opened={modalOpened}
+        onClose={() => setModalOpened(false)}
+        title={modalTitle}
+        size={'40em'}
+      >
         {modelContent}
       </Modal>
       <Box
diff --git a/components/DetailChart.tsx b/components/DetailChart.tsx
index c6c45e6..531f7af 100644
--- a/components/DetailChart.tsx
+++ b/components/DetailChart.tsx
@@ -11,7 +11,7 @@ import {
   TimeScale,
 } from 'chart.js'
 import 'chartjs-adapter-moment'
-import { MonitorState, MonitorTarget } from '@/uptime.types'
+import { MonitorState, MonitorTarget } from '@/types/uptime.types'
 import { iataToCountry } from '@/util/iata'
 
 ChartJS.register(
diff --git a/components/Header.tsx b/components/Header.tsx
index 2b1be33..2e6a149 100644
--- a/components/Header.tsx
+++ b/components/Header.tsx
@@ -1,9 +1,10 @@
 import { Container, Group, Text } from '@mantine/core'
 import classes from '@/styles/Header.module.css'
 import { pageConfig } from '@/uptime.config'
+import { PageConfigLink } from '@/types/config'
 
 export default function Header() {
-  const linkToElement = (link: { label: string; link: string; highlight?: boolean }) => {
+  const linkToElement = (link: PageConfigLink) => {
     return (
       <a
         key={link.label}
@@ -38,11 +39,11 @@ export default function Header() {
         </div>
 
         <Group gap={5} visibleFrom="sm">
-          {pageConfig.links.map(linkToElement)}
+          {pageConfig.links?.map(linkToElement)}
         </Group>
 
         <Group gap={5} hiddenFrom="sm">
-          {pageConfig.links.filter((link) => (link as any).highlight).map(linkToElement)}
+          {pageConfig.links?.filter((link) => link.highlight).map(linkToElement)}
         </Group>
       </Container>
     </header>
diff --git a/pages/api/data.ts b/pages/api/data.ts
index 6186e02..b2d29b5 100644
--- a/pages/api/data.ts
+++ b/pages/api/data.ts
@@ -1,11 +1,10 @@
-import { workerConfig } from "@/uptime.config"
-import { MonitorState } from "@/uptime.types"
-import { NextRequest } from "next/server"
+import { workerConfig } from '@/uptime.config'
+import { MonitorState } from '@/types/uptime.types'
+import { NextRequest } from 'next/server'
 
 export const runtime = 'edge'
 
 export default async function handler(req: NextRequest): Promise<Response> {
-
   const { UPTIMEFLARE_STATE } = process.env as unknown as {
     UPTIMEFLARE_STATE: KVNamespace
   }
@@ -15,11 +14,11 @@ export default async function handler(req: NextRequest): Promise<Response> {
     return new Response(JSON.stringify({ error: 'No data available' }), {
       status: 500,
       headers: {
-        'Content-Type': 'application/json'
-      }
+        'Content-Type': 'application/json',
+      },
     })
   }
-  const state = (JSON.parse(stateStr)) as unknown as MonitorState
+  const state = JSON.parse(stateStr) as unknown as MonitorState
 
   let monitors: any = {}
 
@@ -29,7 +28,7 @@ export default async function handler(req: NextRequest): Promise<Response> {
       up: isUp,
       latency: state.latency[monitor.id].recent.slice(-1)[0].ping,
       location: state.latency[monitor.id].recent.slice(-1)[0].loc,
-      message: isUp ? "OK" : state.incident[monitor.id].slice(-1)[0].error.slice(-1)[0]
+      message: isUp ? 'OK' : state.incident[monitor.id].slice(-1)[0].error.slice(-1)[0],
     }
   }
 
@@ -37,12 +36,12 @@ export default async function handler(req: NextRequest): Promise<Response> {
     up: state.overallUp,
     down: state.overallDown,
     updatedAt: state.lastUpdate,
-    monitors: monitors
+    monitors: monitors,
   }
 
   return new Response(JSON.stringify(ret), {
     headers: {
-      'Content-Type': 'application/json'
-    }
+      'Content-Type': 'application/json',
+    },
   })
-}
\ No newline at end of file
+}
diff --git a/types/config.ts b/types/config.ts
new file mode 100644
index 0000000..01644ea
--- /dev/null
+++ b/types/config.ts
@@ -0,0 +1,80 @@
+export type PageConfig = {
+  title?: string
+  links?: PageConfigLink[]
+  group?: PageConfigGroup
+  maintenances?: Maintenances[]
+}
+
+export type Maintenances = {
+  // title to display
+  title: string
+  // array of monitor ids
+  monitors?: string[]
+  // body message
+  body?: string
+  // start date
+  start?: Date
+  // end Date
+  end?: Date
+  // display color
+  color?: string
+}
+
+export type PageConfigGroup = { [key: string]: string[] }
+
+export type PageConfigLink = {
+  link: string
+  label: string
+  highlight?: boolean
+}
+
+export type WorkerConfig = {
+  kvWriteCooldownMinutes: number
+  monitors: Monitor[]
+  notification?: Notification
+  callbacks?: Callbacks
+}
+
+export type Monitor = {
+  id: string
+  name: string
+  method: 'GET' | 'POST' | 'PATCH' | 'DELETE' | 'TCP_PING'
+  target: string
+  tooltip?: string
+  statusPageLink?: string
+  hideLatencyChart?: boolean
+  expectedCodes?: number[]
+  timeout?: number
+  headers?: { [key: string]: string | number }
+  body?: string
+  responseKeyword?: string
+  responseForbiddenKeyword?: string
+  checkProxy?: string
+  checkProxyFallback?: boolean
+}
+
+export type Notification = {
+  appriseApiServer?: string
+  recipientUrl?: string
+  timeZone?: string
+  gracePeriod?: number
+  skipNotificationIds?: string[]
+}
+
+export type Callbacks = {
+  onStatusChange: (
+    env: any,
+    monitor: any,
+    isUp: boolean,
+    timeIncidentStart: number,
+    timeNow: number,
+    reason: string
+  ) => Promise<any>
+  onIncident: (
+    env: any,
+    monitor: any,
+    timeIncidentStart: number,
+    timeNow: number,
+    reason: string
+  ) => Promise<any>
+}
diff --git a/uptime.types.ts b/types/uptime.types.ts
similarity index 55%
rename from uptime.types.ts
rename to types/uptime.types.ts
index f287622..dcb2594 100644
--- a/uptime.types.ts
+++ b/types/uptime.types.ts
@@ -1,3 +1,5 @@
+import { Monitor } from './config'
+
 type MonitorState = {
   lastUpdate: number
   overallUp: number
@@ -28,24 +30,8 @@ type MonitorState = {
   >
 }
 
-type MonitorTarget = {
-  id: string
-  name: string
-  method: string // "TCP_PING" or Http Method (e.g. GET, POST, OPTIONS, etc.)
-  target: string // url for http, hostname:port for tcp
-  tooltip?: string
-  statusPageLink?: string
-  hideLatencyChart?: boolean
-  checkProxy?: string
-  checkProxyFallback?: boolean
-
-  // HTTP Code
-  expectedCodes?: number[]
-  timeout?: number
-  headers?: Record<string, string | undefined>
+type MonitorTarget = Monitor & {
   body?: BodyInit
-  responseKeyword?: string
-  responseForbiddenKeyword?: string
 }
 
 export type { MonitorState, MonitorTarget }
diff --git a/uptime.config.ts b/uptime.config.ts
index b1bdea8..2ccaeb7 100644
--- a/uptime.config.ts
+++ b/uptime.config.ts
@@ -1,4 +1,6 @@
-const pageConfig = {
+import { PageConfig, WorkerConfig } from './types/config'
+
+const pageConfig: PageConfig = {
   // Title for your status page
   title: "lyc8503's Status Page",
   // Links shown at the header of your status page, could set `highlight` to `true`
@@ -11,12 +13,12 @@ const pageConfig = {
   // If not specified, all monitors will be shown in a single list
   // If specified, monitors will be grouped and ordered, not-listed monitors will be invisble (but still monitored)
   group: {
-    "🌐 Public (example group name)": ['foo_monitor', 'bar_monitor', 'more monitor ids...'],
-    "🔐 Private": ['test_tcp_monitor'],
+    '🌐 Public (example group name)': ['foo_monitor', 'bar_monitor', 'more monitor ids...'],
+    '🔐 Private': ['test_tcp_monitor'],
   },
 }
 
-const workerConfig = {
+const workerConfig: WorkerConfig = {
   // Write KV at most every 3 minutes unless the status changed
   kvWriteCooldownMinutes: 3,
   // Enable HTTP Basic auth for status page & API by uncommenting the line below, format `<USERNAME>:<PASSWORD>`
@@ -77,12 +79,12 @@ const workerConfig = {
   notification: {
     // [Optional] apprise API server URL
     // if not specified, no notification will be sent
-    appriseApiServer: "https://apprise.example.com/notify",
+    appriseApiServer: 'https://apprise.example.com/notify',
     // [Optional] recipient URL for apprise, refer to https://github.com/caronc/apprise
     // if not specified, no notification will be sent
-    recipientUrl: "tgram://bottoken/ChatID",
+    recipientUrl: 'tgram://bottoken/ChatID',
     // [Optional] timezone used in notification messages, default to "Etc/GMT"
-    timeZone: "Asia/Shanghai",
+    timeZone: 'Asia/Shanghai',
     // [Optional] grace period in minutes before sending a notification
     // notification will be sent only if the monitor is down for N continuous checks after the initial failure
     // if not specified, notification will be sent immediately
@@ -101,7 +103,6 @@ const workerConfig = {
     ) => {
       // This callback will be called when there's a status change for any monitor
       // Write any Typescript code here
-
       // This will not follow the grace period settings and will be called immediately when the status changes
       // You need to handle the grace period manually if you want to implement it
     },