diff --git a/client/composables/rpc.ts b/client/composables/rpc.ts
new file mode 100644
index 0000000..75ef8b5
--- /dev/null
+++ b/client/composables/rpc.ts
@@ -0,0 +1,69 @@
+import { createBirpc } from 'birpc'
+import { parse, stringify } from 'flatted'
+import type { ClientFunctions, ServerFunctions } from '../../src/types'
+import { PATH_ENTRY } from '../../src/constants'
+
+const RECONNECT_INTERVAL = 2000
+
+export const wsConnecting = ref(true)
+export const wsError = ref<any>()
+
+let connectPromise = connectWS()
+let onMessage: Function = () => {}
+
+export const clientFunctions = {
+  // will be added in app.vue
+} as ClientFunctions
+
+export const extendedRpcMap = new Map<string, any>()
+
+export const rpc = createBirpc<ServerFunctions>(clientFunctions, {
+  post: async (d) => {
+    (await connectPromise).send(d)
+  },
+  on: (fn) => { onMessage = fn },
+  serialize: stringify,
+  deserialize: parse,
+  resolver(name, fn) {
+    if (fn)
+      return fn
+    if (!name.includes(':'))
+      return
+    const [namespace, fnName] = name.split(':')
+    return extendedRpcMap.get(namespace)?.[fnName]
+  },
+  onError(error, name) {
+    console.error(`[nuxt-devtools] RPC error on executing "${name}":`, error)
+  },
+})
+
+async function connectWS() {
+  const wsUrl = new URL(`ws://host${PATH_ENTRY}`)
+  wsUrl.protocol = location.protocol === 'https:' ? 'wss:' : 'ws:'
+  wsUrl.host = 'localhost:3000'
+
+  const ws = new WebSocket(wsUrl.toString())
+  ws.addEventListener('message', e => onMessage(String(e.data)))
+  ws.addEventListener('error', (e) => {
+    console.error(e)
+    wsError.value = e
+  })
+  ws.addEventListener('close', () => {
+    // eslint-disable-next-line no-console
+    console.log('[nuxt-devtools] WebSocket closed, reconnecting...')
+    wsConnecting.value = true
+    setTimeout(async () => {
+      connectPromise = connectWS()
+    }, RECONNECT_INTERVAL)
+  })
+  wsConnecting.value = true
+  if (ws.readyState !== WebSocket.OPEN)
+    await new Promise(resolve => ws.addEventListener('open', resolve))
+
+  // eslint-disable-next-line no-console
+  console.log('[nuxt-devtools] WebSocket connected.')
+  wsConnecting.value = false
+  wsError.value = null
+
+  return ws
+}