diff --git a/apps/cli/src/cli.ts b/apps/cli/src/cli.ts
index f4ac2e85..ba435070 100644
--- a/apps/cli/src/cli.ts
+++ b/apps/cli/src/cli.ts
@@ -8,7 +8,7 @@ import * as fs from 'fs'
 import * as path from 'path'
 import { execSync } from 'child_process'
 import { Command } from 'commander'
-import { loadConfig, getConfigPath } from '@openchatlab/config'
+import { DEFAULT_API_PORT, loadConfig, getConfigPath } from '@openchatlab/config'
 import {
   NodePathProvider,
   DatabaseManager,
@@ -276,7 +276,7 @@ program
 program
   .command('serve')
   .description('Start the HTTP API server')
-  .option('--port <port>', 'Server port', '3110')
+  .option('--port <port>', 'Server port', String(DEFAULT_API_PORT))
   .option('--host <host>', 'Listen address', '127.0.0.1')
   .option('--token <token>', 'Custom Bearer Token (reads from config or auto-generates if omitted)')
   .option('--web [dir]', 'Serve Web frontend static assets (defaults to dist-web/)')
@@ -335,7 +335,7 @@ program
 program
   .command('web')
   .description('Launch Web UI with one click (HTTP API + browser auto-open)')
-  .option('--port <port>', 'Server port', '3110')
+  .option('--port <port>', 'Server port', String(DEFAULT_API_PORT))
   .option('--host <host>', 'Listen address', '127.0.0.1')
   .option('--no-open', 'Do not auto-open browser')
   .action(async (options) => {
diff --git a/packages/config/src/index.ts b/packages/config/src/index.ts
index 6f9ba4f5..bd13fa4b 100644
--- a/packages/config/src/index.ts
+++ b/packages/config/src/index.ts
@@ -5,7 +5,7 @@
  */
 
 export { loadConfig, getConfigPath, getConfigDir, writeConfigField } from './loader'
-export { configSchema } from './schema'
+export { configSchema, DEFAULT_API_PORT } from './schema'
 export type { ChatLabConfig, LlmConfig, DataConfig, ApiConfig, LocaleConfig, UiConfig } from './schema'
 export {
   loadAuthProfiles,
diff --git a/packages/config/src/schema.ts b/packages/config/src/schema.ts
index 722a4b0f..98dc6b8f 100644
--- a/packages/config/src/schema.ts
+++ b/packages/config/src/schema.ts
@@ -6,6 +6,8 @@
 
 import { z } from 'zod'
 
+export const DEFAULT_API_PORT = 3110
+
 export const llmConfigSchema = z.object({
   provider: z.string().default(''),
   model: z.string().default(''),
@@ -17,7 +19,7 @@ export const dataConfigSchema = z.object({
 })
 
 export const apiConfigSchema = z.object({
-  port: z.number().int().min(1).max(65535).default(3210),
+  port: z.number().int().min(1).max(65535).default(DEFAULT_API_PORT),
   host: z.string().default('127.0.0.1'),
   token: z.string().default(''),
 })
diff --git a/scripts/dev-server-command.mjs b/scripts/dev-server-command.mjs
new file mode 100644
index 00000000..2329a3c4
--- /dev/null
+++ b/scripts/dev-server-command.mjs
@@ -0,0 +1,11 @@
+export function createChatlabServeCommand({ serverDir, backendPort, nodeExecutable = process.execPath }) {
+  return {
+    command: nodeExecutable,
+    args: ['--watch', '--import', 'tsx', 'src/cli.ts', 'serve', '--port', String(backendPort)],
+    options: {
+      cwd: serverDir,
+      stdio: ['ignore', 'pipe', 'pipe'],
+      env: { ...process.env },
+    },
+  }
+}
diff --git a/scripts/dev-server-command.test.mjs b/scripts/dev-server-command.test.mjs
new file mode 100644
index 00000000..4ac0a2d6
--- /dev/null
+++ b/scripts/dev-server-command.test.mjs
@@ -0,0 +1,18 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { createChatlabServeCommand } from './dev-server-command.mjs'
+
+test('web dev backend runs through the current Node executable with the tsx loader', () => {
+  const command = createChatlabServeCommand({
+    rootDir: '/repo',
+    serverDir: '/repo/apps/cli',
+    coreDir: '/repo/packages/core/src',
+    runtimeDir: '/repo/packages/node-runtime/src',
+    backendPort: 3110,
+    nodeExecutable: '/custom/node',
+  })
+
+  assert.equal(command.command, '/custom/node')
+  assert.deepEqual(command.args, ['--watch', '--import', 'tsx', 'src/cli.ts', 'serve', '--port', '3110'])
+})
diff --git a/vite.web.config.mts b/vite.web.config.mts
index 197eff6b..e319c9d3 100644
--- a/vite.web.config.mts
+++ b/vite.web.config.mts
@@ -17,8 +17,10 @@ import * as net from 'net'
 import { defineConfig, type Plugin } from 'vite'
 import vue from '@vitejs/plugin-vue'
 import ui from '@nuxt/ui/vite'
+import { DEFAULT_API_PORT } from './packages/config/src/schema'
+import { createChatlabServeCommand } from './scripts/dev-server-command.mjs'
 
-const BACKEND_PORT = 3110
+const BACKEND_PORT = DEFAULT_API_PORT
 
 function isPortInUse(port: number): Promise<boolean> {
   return new Promise((resolve) => {
@@ -51,28 +53,11 @@ function chatlabServePlugin(): Plugin {
       }
 
       const serverDir = resolve(__dirname, 'apps/cli')
-      const coreDir = resolve(__dirname, 'packages/core/src')
-      const runtimeDir = resolve(__dirname, 'packages/node-runtime/src')
-      serverProcess = spawn(
-        'pnpm',
-        [
-          'tsx',
-          'watch',
-          '--include',
-          `${coreDir}/**`,
-          '--include',
-          `${runtimeDir}/**`,
-          'src/cli.ts',
-          'serve',
-          '--port',
-          String(BACKEND_PORT),
-        ],
-        {
-          cwd: serverDir,
-          stdio: ['ignore', 'pipe', 'pipe'],
-          env: { ...process.env },
-        }
-      )
+      const serveCommand = createChatlabServeCommand({
+        serverDir,
+        backendPort: BACKEND_PORT,
+      })
+      serverProcess = spawn(serveCommand.command, serveCommand.args, serveCommand.options)
 
       serverProcess.stdout?.on('data', (data: Buffer) => {
         const line = data.toString().trim()