diff --git a/README.md b/README.md
index 331b832..d18867f 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 ![build-status](https://github.com/alswl/dbml-editor/actions/workflows/ci.yaml/badge.svg)
 
-Online editor for [DBML](https://dbml.dbdiagram.io/home/) files.
+Free online editor [DBML](https://dbml.dbdiagram.io/home/) editor.
 
 ## Online Editor
 
@@ -10,8 +10,10 @@ Online editor for [DBML](https://dbml.dbdiagram.io/home/) files.
 
 ## Features
 
-- Syntax highlighting
+- DBML syntax highlighting
 - Live preview
+- Import from SQL
+- Export to SQL
 
 ## Alternatives
 
@@ -22,6 +24,8 @@ Online editor for [DBML](https://dbml.dbdiagram.io/home/) files.
 
 ## Roadmap
 
-- Full support for DBML feature
-- Export to SQL
-- Import from SQL
+- Better syntax highlighting
+- Editor inline error hint
+- hidden foreign key
+- better style based on note
+- ER positions save and restore
diff --git a/src/components/viewer/viewer.tsx b/src/components/viewer/viewer.tsx
index 19113d5..e4c4556 100644
--- a/src/components/viewer/viewer.tsx
+++ b/src/components/viewer/viewer.tsx
@@ -1,4 +1,4 @@
-import parseDatabaseToER from '@/parser/parser';
+import parseDatabaseToER from '@/services/er';
 import { DagreLayout } from '@antv/layout';
 import { Graph, Model } from '@antv/x6';
 import { Snapline } from '@antv/x6-plugin-snapline';
diff --git a/src/global.ts b/src/global.ts
index 24be6ad..925989b 100644
--- a/src/global.ts
+++ b/src/global.ts
@@ -1,5 +1,5 @@
-import registerSyntax from '@/editor/syntax';
 import registerER from '@/nodes/er';
+import registerSyntax from '@/services/editor/syntax';
 
 registerER();
 registerSyntax();
diff --git a/src/pages/Home/index.tsx b/src/pages/Home/index.tsx
index b384474..82029b1 100644
--- a/src/pages/Home/index.tsx
+++ b/src/pages/Home/index.tsx
@@ -1,4 +1,4 @@
-import { CompilerDiagnostic, exporter, importer, Parser } from '@dbml/core';
+import { exporter, importer, Parser } from '@dbml/core';
 import { Col, FloatButton, message, Modal, Row, Select, Space } from 'antd';
 import { debounce } from 'lodash-es';
 import { useEffect, useState } from 'react';
@@ -6,21 +6,14 @@ import MonacoEditor from 'react-monaco-editor';
 
 import { InitCode } from '@/components/editor';
 import Viewer from '@/components/viewer/viewer';
+import ErrorFmt, { ExportFormat, ImportFormat } from '@/services/dbml';
 import { ExportOutlined, ImportOutlined } from '@ant-design/icons';
 import { PageContainer } from '@ant-design/pro-components';
 import { CompilerError } from '@dbml/core/types/parse/error';
 import TextArea from 'antd/es/input/TextArea';
 import './index.less';
 
-type ImportFormat =
-  | 'dbml'
-  | 'mysql'
-  | 'postgres'
-  | 'json'
-  | 'mssql'
-  | 'postgresLegacy';
-
-type ExportFormat = 'dbml' | 'mysql' | 'postgres' | 'json' | 'mssql' | 'oracle';
+const defaultBuildDelay = 2000;
 
 export default () => {
   const [messageApi, contextHolder] = message.useMessage();
@@ -39,40 +32,18 @@ export default () => {
   const [exportText, setExportText] = useState('');
   const [regen, setRegen] = useState(0);
 
-  // editorDidMount
+  // editor init
   const editorDidMount = () => {
     setDatabase(initialDatabase);
   };
 
-  // code change
-  useEffect(() => {
-    try {
-      const newDB = parser.parse(code, 'dbmlv2');
-      setDatabase(newDB);
-    } catch (e) {
-      if (e as CompilerError) {
-        const diags = (e as CompilerError).diags
-          .map((d: CompilerDiagnostic) => {
-            return `${d.location.start.line}:${d.location.start.column} ${d.message}`;
-          })
-          .join('\n');
-
-        messageApi.error(diags);
-        // TODO hl to editor
-      } else if (e instanceof Error) {
-        messageApi.error(`${e.message}`);
-      } else {
-        throw e;
-      }
-    }
-  }, [code]);
-
   // editor change
   const editorOnChange = (newValue: any) => {
     setCode(newValue);
   };
-  const debouncedOnChange = debounce(editorOnChange, 500);
+  const debouncedOnChange = debounce(editorOnChange, defaultBuildDelay);
 
+  // handle import
   const handleImport = () => {
     try {
       const s = importer.import(importText, importFormat);
@@ -80,13 +51,7 @@ export default () => {
       setIsImportModalOpen(false);
     } catch (e) {
       if (e as CompilerError) {
-        const diags = (e as CompilerError).diags
-          .map((d: CompilerDiagnostic) => {
-            return `${d.location.start.line}:${d.location.start.column} ${d.message}`;
-          })
-          .join('\n');
-
-        messageApi.error(diags);
+        messageApi.error(ErrorFmt(e as CompilerError));
       } else if (e instanceof Error) {
         messageApi.error(`${e.message}`);
         return;
@@ -96,6 +61,24 @@ export default () => {
     }
   };
 
+  // code change regen database
+  useEffect(() => {
+    try {
+      const newDB = parser.parse(code, 'dbmlv2');
+      setDatabase(newDB);
+    } catch (e) {
+      if (e as CompilerError) {
+        messageApi.error(ErrorFmt(e as CompilerError));
+        // TODO hl to editor
+      } else if (e instanceof Error) {
+        messageApi.error(`${e.message}`);
+      } else {
+        throw e;
+      }
+    }
+  }, [code]);
+
+  // export regen
   useEffect(() => {
     if (!isExportModalOpen) return;
 
@@ -104,13 +87,7 @@ export default () => {
       setExportText(s);
     } catch (e) {
       if (e as CompilerError) {
-        const diags = (e as CompilerError).diags
-          .map((d: CompilerDiagnostic) => {
-            return `${d.location.start.line}:${d.location.start.column} ${d.message}`;
-          })
-          .join('\n');
-
-        messageApi.error(diags);
+        messageApi.error(ErrorFmt(e as CompilerError));
       } else if (e instanceof Error) {
         messageApi.error(`${e.message}`);
       } else {
diff --git a/src/services/dbml/index.ts b/src/services/dbml/index.ts
new file mode 100644
index 0000000..fc39b87
--- /dev/null
+++ b/src/services/dbml/index.ts
@@ -0,0 +1,22 @@
+import { CompilerDiagnostic } from '@dbml/core';
+import { CompilerError } from '@dbml/core/types/parse/error';
+
+type ImportFormat =
+  | 'dbml'
+  | 'mysql'
+  | 'postgres'
+  | 'json'
+  | 'mssql'
+  | 'postgresLegacy';
+type ExportFormat = 'dbml' | 'mysql' | 'postgres' | 'json' | 'mssql' | 'oracle';
+
+export default function ErrorFmt(e: CompilerError): string {
+  const diags = e.diags
+    .map((d: CompilerDiagnostic) => {
+      return `${d.location.start.line}:${d.location.start.column} ${d.message}`;
+    })
+    .join('\n');
+  return diags;
+}
+
+export type { ExportFormat, ImportFormat };
diff --git a/src/editor/syntax.ts b/src/services/editor/syntax.ts
similarity index 94%
rename from src/editor/syntax.ts
rename to src/services/editor/syntax.ts
index e844025..91cf950 100644
--- a/src/editor/syntax.ts
+++ b/src/services/editor/syntax.ts
@@ -138,6 +138,7 @@ function registerSyntax() {
         { include: '@whitespace' },
 
         // delimiters and operators
+        // eslint-disable-next-line no-useless-escape
         [/[\[\]{}().,;]/, '@brackets'],
         [
           /@symbols/,
@@ -150,6 +151,7 @@ function registerSyntax() {
         ],
 
         // numbers
+        // eslint-disable-next-line no-useless-escape
         [/\d*\.\d+([eE][\-+]?\d+)?/, 'number.float'],
         [/0[xX][0-9a-fA-F]+/, 'number.hex'],
         [/\d+/, 'number'],
@@ -165,8 +167,10 @@ function registerSyntax() {
       ],
 
       comment: [
+        // eslint-disable-next-line no-useless-escape
         [/[^\/*]+/, 'comment'],
         [/\*\//, 'comment', '@pop'],
+        // eslint-disable-next-line no-useless-escape
         [/[\/*]/, 'comment'],
       ],
 
diff --git a/src/parser/parser.ts b/src/services/er/index.ts
similarity index 100%
rename from src/parser/parser.ts
rename to src/services/er/index.ts