diff --git a/src/layouts/Main.tsx b/src/layouts/Main.tsx
index 262e739..06902a1 100644
--- a/src/layouts/Main.tsx
+++ b/src/layouts/Main.tsx
@@ -1,6 +1,5 @@
-import { Event, kinds } from 'nostr-tools'
+import { Event, getPublicKey, kinds, nip19 } from 'nostr-tools'
 import { useCallback, useEffect, useRef, useState } from 'react'
-import { useDispatch, useSelector } from 'react-redux'
 import { Outlet, useNavigate, useSearchParams } from 'react-router-dom'
 import { AppBar } from '../components/AppBar/AppBar'
 import { LoadingSpinner } from '../components/LoadingSpinner'
@@ -12,12 +11,11 @@ import {
 import {
   restoreState,
   setMetadataEvent,
+  updateKeyPair,
   updateLoginMethod,
   updateNostrLoginAuthMethod,
   updateUserAppData
 } from '../store/actions'
-import { State } from '../store/rootReducer'
-import { Dispatch } from '../store/store'
 import { setUserRobotImage } from '../store/userRobotImage/action'
 import {
   getRoboHashPicture,
@@ -25,7 +23,7 @@ import {
   loadState,
   subscribeForSigits
 } from '../utils'
-import { useAppSelector } from '../hooks'
+import { useAppDispatch, useAppSelector } from '../hooks'
 import styles from './style.module.scss'
 import { useLogout } from '../hooks/useLogout'
 import { LoginMethod } from '../store/auth/types'
@@ -33,13 +31,13 @@ import { NostrLoginAuthOptions } from 'nostr-login/dist/types'
 import { init as initNostrLogin } from 'nostr-login'
 
 export const MainLayout = () => {
-  const [searchParams] = useSearchParams()
+  const [searchParams, setSearchParams] = useSearchParams()
   const navigate = useNavigate()
-  const dispatch: Dispatch = useDispatch()
+  const dispatch = useAppDispatch()
   const logout = useLogout()
   const [isLoading, setIsLoading] = useState(true)
   const [loadingSpinnerDesc, setLoadingSpinnerDesc] = useState(`Loading App`)
-  const authState = useSelector((state: State) => state.auth)
+  const authState = useAppSelector((state) => state.auth)
   const usersAppData = useAppSelector((state) => state.userAppData)
 
   // Ref to track if `subscribeForSigits` has been called
@@ -125,7 +123,7 @@ export const MainLayout = () => {
   }, [])
 
   useEffect(() => {
-    if (authState.loggedIn && usersAppData) {
+    if (authState && authState.loggedIn && usersAppData) {
       const pubkey = authState.usersPubkey || authState.keyPair?.public
 
       if (pubkey && !hasSubscribed.current) {
@@ -164,6 +162,53 @@ export const MainLayout = () => {
     }
   }, [authState, dispatch])
 
+  useEffect(() => {
+    // Developer login with ?nsec= (not recommended)
+    const nsec = searchParams.get('nsec')
+    if (!nsec) return
+
+    // Clear nsec from the url immediately
+    searchParams.delete('nsec')
+    setSearchParams(searchParams)
+
+    if (!authState?.loggedIn) {
+      if (!nsec.startsWith('nsec')) {
+        console.error('Invalid format, use private key (nsec)')
+        return
+      }
+
+      try {
+        const privateKey = nip19.decode(nsec).data as Uint8Array
+        if (!privateKey) {
+          console.error('Failed to convert the private key.')
+          return
+        }
+
+        const publickey = getPublicKey(privateKey)
+
+        dispatch(
+          updateKeyPair({
+            private: nsec,
+            public: publickey
+          })
+        )
+        dispatch(updateLoginMethod(LoginMethod.privateKey))
+        ;(async () => {
+          const authController = new AuthController()
+          await authController
+            .authAndGetMetadataAndRelaysMap(publickey)
+            .catch((err) => {
+              console.error('Error occurred in authentication: ' + err)
+              return null
+            })
+        })()
+      } catch (err) {
+        console.error(`Error decoding the nsec. ${err}`)
+      }
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [dispatch, searchParams])
+
   if (isLoading) return <LoadingSpinner desc={loadingSpinnerDesc} />
 
   const isDev = import.meta.env.MODE === 'development'