diff --git a/conf/base.js b/conf/base.js
deleted file mode 100644
index 209e8f0..0000000
--- a/conf/base.js
+++ /dev/null
@@ -1,36 +0,0 @@
-/**
- * Base configuration - shared across all environments
- */
-
-module.exports = {
-  server: {
-    port: 3000,
-    host: '0.0.0.0'
-  },
-  
-  gateway: {
-    url: 'http://127.0.0.1:18789',
-    token: 'a41984619a5f4b9bf9148ab6eb4abca53eb796d046cbbec5'
-  },
-  
-  session: {
-    secret: 'change-me-in-production',
-    maxAge: 24 * 60 * 60 * 1000 // 24 hours
-  },
-  
-  auth: {
-    disabled: false,
-    ldap: {
-      enabled: false,
-      url: 'ldap://localhost:389',
-      baseDN: 'ou=users,dc=example,dc=com',
-      bindDN: '',
-      bindPassword: '',
-      searchFilter: '(uid={{username}})'
-    }
-  },
-  
-  data: {
-    dir: './data'
-  }
-};
\ No newline at end of file
diff --git a/conf/base.json b/conf/base.json
new file mode 100644
index 0000000..d2ee6bf
--- /dev/null
+++ b/conf/base.json
@@ -0,0 +1,27 @@
+{
+  "server": {
+    "port": 3000,
+    "host": "0.0.0.0"
+  },
+  "gateway": {
+    "url": "http://127.0.0.1:18789"
+  },
+  "session": {
+    "secret": "change-me-in-production",
+    "maxAge": 86400000
+  },
+  "auth": {
+    "disabled": false,
+    "ldap": {
+      "enabled": false,
+      "url": "ldap://localhost:389",
+      "baseDN": "ou=users,dc=example,dc=com",
+      "bindDN": "",
+      "bindPassword": "",
+      "searchFilter": "(uid={{username}})"
+    }
+  },
+  "data": {
+    "dir": "./data"
+  }
+}
\ No newline at end of file
diff --git a/conf/development.js b/conf/development.js
deleted file mode 100644
index 02892d7..0000000
--- a/conf/development.js
+++ /dev/null
@@ -1,16 +0,0 @@
-/**
- * Development environment configuration
- */
-
-module.exports = {
-  auth: {
-    disabled: true, // Skip auth in dev
-    ldap: {
-      enabled: false
-    }
-  },
-  
-  server: {
-    // Vite runs on 5173, proxy from there
-  }
-};
\ No newline at end of file
diff --git a/conf/development.json b/conf/development.json
new file mode 100644
index 0000000..7c54e5b
--- /dev/null
+++ b/conf/development.json
@@ -0,0 +1,8 @@
+{
+  "auth": {
+    "disabled": true,
+    "ldap": {
+      "enabled": false
+    }
+  }
+}
\ No newline at end of file
diff --git a/conf/production.js b/conf/production.js
deleted file mode 100644
index 3d7da1a..0000000
--- a/conf/production.js
+++ /dev/null
@@ -1,22 +0,0 @@
-/**
- * Production environment configuration
- */
-
-module.exports = {
-  server: {
-    // Use PORT env var if set, otherwise default
-    port: parseInt(process.env.PORT) || 3000
-  },
-  
-  session: {
-    // Should be set via secrets.js in production
-    secret: process.env.SESSION_SECRET || 'CHANGE-ME-NOW'
-  },
-  
-  auth: {
-    disabled: false,
-    ldap: {
-      enabled: process.env.LDAP_ENABLED === 'true'
-    }
-  }
-};
\ No newline at end of file
diff --git a/conf/production.json b/conf/production.json
new file mode 100644
index 0000000..e4075ac
--- /dev/null
+++ b/conf/production.json
@@ -0,0 +1,11 @@
+{
+  "server": {
+    "port": 3000
+  },
+  "session": {
+    "secret": "CHANGE-ME-NOW"
+  },
+  "auth": {
+    "disabled": false
+  }
+}
\ No newline at end of file
diff --git a/conf/secrets.example.js b/conf/secrets.example.js
deleted file mode 100644
index 4725417..0000000
--- a/conf/secrets.example.js
+++ /dev/null
@@ -1,26 +0,0 @@
-/**
- * Example secrets file
- * 
- * Copy this to secrets.js and fill in your actual values
- * secrets.js is ignored by git
- */
-
-module.exports = {
-  gateway: {
-    // Your OpenClaw gateway token
-    token: 'your-gateway-token-here'
-  },
-  
-  session: {
-    // Random string for session signing
-    secret: 'generate-a-random-string-here'
-  },
-  
-  auth: {
-    ldap: {
-      // LDAP bind credentials (if needed for search)
-      bindDN: 'cn=admin,dc=example,dc=com',
-      bindPassword: 'ldap-admin-password'
-    }
-  }
-};
\ No newline at end of file
diff --git a/conf/secrets.example.json b/conf/secrets.example.json
new file mode 100644
index 0000000..3ee7d5b
--- /dev/null
+++ b/conf/secrets.example.json
@@ -0,0 +1,14 @@
+{
+  "gateway": {
+    "token": "your-gateway-token-here"
+  },
+  "session": {
+    "secret": "generate-a-random-string-here"
+  },
+  "auth": {
+    "ldap": {
+      "bindDN": "cn=admin,dc=example,dc=com",
+      "bindPassword": "ldap-admin-password"
+    }
+  }
+}
\ No newline at end of file
diff --git a/conf/secrets.json b/conf/secrets.json
new file mode 100644
index 0000000..5cd5219
--- /dev/null
+++ b/conf/secrets.json
@@ -0,0 +1,14 @@
+{
+  "gateway": {
+    "token": "a41984619a5f4b9bf9148ab6eb4abca53eb796d046cbbec5"
+  },
+  "session": {
+    "secret": "dev-session-secret-change-in-production"
+  },
+  "auth": {
+    "ldap": {
+      "bindDN": "",
+      "bindPassword": ""
+    }
+  }
+}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index d87ceb1..01d4cf2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,6 @@
       "name": "openclaw-webui",
       "version": "1.0.0",
       "dependencies": {
-        "@simpleworkjs/conf": "^1.0.0",
         "eventsource": "^2.0.2",
         "express": "^4.18.2",
         "express-session": "^1.17.3",
@@ -871,18 +870,6 @@
         "win32"
       ]
     },
-    "node_modules/@simpleworkjs/conf": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@simpleworkjs/conf/-/conf-1.0.0.tgz",
-      "integrity": "sha512-p1dQAELW0oUBRpDoz260TYw18IMI/Y11xYAb17P1MEPjsTAUB0LWE/6ZeA2VQmpU/LXoRnDysg0G/oASGILyUA==",
-      "license": "MIT",
-      "dependencies": {
-        "extend": "^3.0.2"
-      },
-      "engines": {
-        "node": ">=16.0.0"
-      }
-    },
     "node_modules/@types/estree": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
@@ -1448,12 +1435,6 @@
         "url": "https://opencollective.com/express"
       }
     },
-    "node_modules/extend": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
-      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==",
-      "license": "MIT"
-    },
     "node_modules/extsprintf": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.4.1.tgz",
diff --git a/package.json b/package.json
index 891a4c4..cb52fd4 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,6 @@
     "preview": "vite preview"
   },
   "dependencies": {
-    "@simpleworkjs/conf": "^1.0.0",
     "eventsource": "^2.0.2",
     "express": "^4.18.2",
     "express-session": "^1.17.3",
diff --git a/server/config.js b/server/config.js
new file mode 100644
index 0000000..87eef20
--- /dev/null
+++ b/server/config.js
@@ -0,0 +1,75 @@
+/**
+ * Simple ESM-compatible configuration loader
+ * Loads JSON files: base.json -> environment.json -> secrets.json
+ */
+
+import { readFileSync, existsSync } from 'fs';
+import { join, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+function deepMerge(target, source) {
+  const result = { ...target };
+  for (const key of Object.keys(source)) {
+    if (source[key] && typeof source[key] === 'object' && !Array.isArray(source[key])) {
+      result[key] = deepMerge(result[key] || {}, source[key]);
+    } else {
+      result[key] = source[key];
+    }
+  }
+  return result;
+}
+
+function loadJsonFile(filename) {
+  const path = join(__dirname, '..', 'conf', filename);
+  if (!existsSync(path)) return {};
+  try {
+    return JSON.parse(readFileSync(path, 'utf-8'));
+  } catch (err) {
+    console.warn(`Warning: Failed to load ${filename}:`, err.message);
+    return {};
+  }
+}
+
+// Load configuration
+const environment = process.env.NODE_ENV || 'development';
+
+const base = loadJsonFile('base.json');
+const envConfig = loadJsonFile(`${environment}.json`);
+const secrets = loadJsonFile('secrets.json');
+
+// Merge all configs
+const config = deepMerge(deepMerge(base, envConfig), secrets);
+
+// Add environment info
+config.environment = environment;
+
+// Allow env var overrides for critical settings
+if (process.env.PORT) {
+  config.server = config.server || {};
+  config.server.port = parseInt(process.env.PORT);
+}
+
+if (process.env.OPENCLAW_GATEWAY) {
+  config.gateway = config.gateway || {};
+  config.gateway.url = process.env.OPENCLAW_GATEWAY;
+}
+
+if (process.env.OPENCLAW_TOKEN) {
+  config.gateway = config.gateway || {};
+  config.gateway.token = process.env.OPENCLAW_TOKEN;
+}
+
+if (process.env.SESSION_SECRET) {
+  config.session = config.session || {};
+  config.session.secret = process.env.SESSION_SECRET;
+}
+
+if (process.env.LDAP_ENABLED === 'true') {
+  config.auth = config.auth || {};
+  config.auth.ldap = config.auth.ldap || {};
+  config.auth.ldap.enabled = true;
+}
+
+export default config;
\ No newline at end of file
diff --git a/server/index.js b/server/index.js
index b065233..7a67140 100644
--- a/server/index.js
+++ b/server/index.js
@@ -18,11 +18,11 @@ import { join, dirname } from 'path';
 import { fileURLToPath } from 'url';
 import ldap from 'ldapjs';
 import { v4 as uuidv4 } from 'uuid';
-import conf from '@simpleworkjs/conf';
+import conf from './config.js';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 
-// Configuration via @simpleworkjs/conf
+// Configuration
 const CONFIG = {
   port: conf.server?.port || 3000,
   gatewayUrl: conf.gateway?.url || 'http://127.0.0.1:18789',
@@ -38,7 +38,8 @@ const CONFIG = {
     bindPassword: conf.auth?.ldap?.bindPassword || '',
     searchFilter: conf.auth?.ldap?.searchFilter || '(uid={{username}})'
   },
-  dataDir: conf.data?.dir || join(__dirname, '../data')
+  dataDir: conf.data?.dir || join(__dirname, '../data'),
+  environment: conf.environment
 };
 
 // Ensure data directory exists