diff --git a/README.md b/README.md
index 1b57bfb..eb48039 100644
--- a/README.md
+++ b/README.md
@@ -14,11 +14,6 @@ This library automatically generates TypeScript types (`*.d.ts`) by parsing Goog
 - Generate types(`*.d.ts`) for Google Sheets at the desired location
 - Customize the type and type file name
 
-### TODO
-
-- CLI (`npx google-spreadsheet-dts ...`)
-- Private Google Sheets parser
-
 ## 📦 Install
 
 ```bash
@@ -44,6 +39,8 @@ import { generateDts } from 'google-spreadsheet-dts';
 import { resolve } from 'node:path';
 import { publicGoogleSheetsParser } from 'google-spreadsheet-dts/parser';
 
+import PublicGoogleSheetsParser from 'public-google-sheets-parser';
+
 generateDts({
   name: 'GoogleSheets',
   directory: resolve(__dirname, '../src'),
@@ -58,15 +55,13 @@ generateDts({
     ]
   }
 
-  // Specify the Google Sheets to parse
-  parser: publicGoogleSheetsParser({
-    spreadSheetId: '1j23zhzHcPd_LzDQ7uPrXgMJfPoZYs289boUKoKnAjUo',
-    path: ['Key', 'Property'],
-    typeName: 'Type',
-    publicGoogleSheetsParser: {
-      sheetName: 'ParserTest',
+  parser: publicGoogleSheetsParser(
+    new PublicGoogleSheetsParser(/* ... */),
+    {
+      path: ['Key', 'Property'],
+      typeName: 'Type',
     },
-  }),
+  ),
 });
 ```
 
@@ -86,6 +81,8 @@ const { generateDts } = require('google-spreadsheet-dts');
 const { resolve } = require('node:path');
 const { publicGoogleSheetsParser } = require('google-spreadsheet-dts/parser');
 
+const PublicGoogleSheetsParser = require('public-google-sheets-parser');
+
 generateDts({
   name: 'GoogleSheets',
   directory: resolve(__dirname, '../src'),
@@ -99,14 +96,13 @@ generateDts({
     ]
   }
 
-  parser: publicGoogleSheetsParser({
-    spreadSheetId: '1j23zhzHcPd_LzDQ7uPrXgMJfPoZYs289boUKoKnAjUo',
-    path: ['Key', 'Property'],
-    typeName: 'Type',
-    publicGoogleSheetsParser: {
-      sheetName: 'ParserTest',
+  parser: publicGoogleSheetsParser(
+    new PublicGoogleSheetsParser(/* ... */),
+    {
+      path: ['Key', 'Property'],
+      typeName: 'Type',
     },
-  }),
+  ),
 });
 ```
 
diff --git a/src/__tests__/parser.test.ts b/src/__tests__/parser.test.ts
index c74324f..bfa1165 100644
--- a/src/__tests__/parser.test.ts
+++ b/src/__tests__/parser.test.ts
@@ -1,12 +1,19 @@
 import { describe, it, expect } from 'vitest';
 import { publicGoogleSheetsParser } from '../parser';
-
-const SPREADSHEET_ID = '1j23zhzHcPd_LzDQ7uPrXgMJfPoZYs289boUKoKnAjUo';
+import PublicGoogleSheetsParser from 'public-google-sheets-parser';
 
 // https://docs.google.com/spreadsheets/d/1j23zhzHcPd_LzDQ7uPrXgMJfPoZYs289boUKoKnAjUo/edit#gid=0
 const SHEET_NAME = 'ParserTest';
+const SPREADSHEET_ID = '1j23zhzHcPd_LzDQ7uPrXgMJfPoZYs289boUKoKnAjUo';
 
 describe('publicGoogleSheetsParser', () => {
+  const publicGoogleSheetsParserInstance = new PublicGoogleSheetsParser(
+    SPREADSHEET_ID,
+    {
+      sheetName: SHEET_NAME,
+    },
+  );
+
   const expected = {
     click_conversation_data: {
       conversation_id: 'string',
@@ -24,31 +31,25 @@ describe('publicGoogleSheetsParser', () => {
   };
 
   it('Common forms', async () => {
-    const parsed = await publicGoogleSheetsParser({
-      spreadsheetId: SPREADSHEET_ID,
-      path: ['Key', 'Property'],
-      typeName: 'Type',
-      options: {
-        publicGoogleSheetsParser: {
-          sheetName: SHEET_NAME,
-        },
+    const parsed = await publicGoogleSheetsParser(
+      publicGoogleSheetsParserInstance,
+      {
+        path: ['Key', 'Property'],
+        typeName: 'Type',
       },
-    })();
+    )();
 
     expect(parsed).toEqual(expected);
   });
 
   it('With empty lines', async () => {
-    const parsed = await publicGoogleSheetsParser({
-      spreadsheetId: SPREADSHEET_ID,
-      path: ['Key', 'Property'],
-      typeName: 'Type',
-      options: {
-        publicGoogleSheetsParser: {
-          sheetName: `${SHEET_NAME}-EmptyLines`,
-        },
+    const parsed = await publicGoogleSheetsParser(
+      publicGoogleSheetsParserInstance,
+      {
+        path: ['Key', 'Property'],
+        typeName: 'Type',
       },
-    })();
+    )();
 
     expect(parsed).toEqual(expected);
   });
diff --git a/src/parser/README.md b/src/parser/README.md
index 0f8a6b6..536cd88 100644
--- a/src/parser/README.md
+++ b/src/parser/README.md
@@ -5,7 +5,7 @@
 
 ## public-google-sheets-parser
 
-A parser that parses public Google Sheets. This parser uses [public-google-sheets-parser](https://github.com/fureweb-com/public-google-sheets-parser).
+A parser that parses **public** Google Sheets. This parser uses [public-google-sheets-parser](https://github.com/fureweb-com/public-google-sheets-parser).
 
 ### Usage
 
@@ -13,14 +13,16 @@ A parser that parses public Google Sheets. This parser uses [public-google-sheet
 import { generateDts } from 'google-spreadsheet-dts';
 import { publicGoogleSheetsParser } from 'google-spreadsheet-dts/parser';
 
-const parser = publicGoogleSheetsParser({
-  spreadSheetId: '1j23zhzHcPd_LzDQ7uPrXgMJfPoZYs289boUKoKnAjUo',
-  path: ['Key', 'Property'],
-  typeName: 'Type',
-  publicGoogleSheetsParser: {
-    sheetName: 'ParserTest',
+import PublicGoogleSheetsParser from 'public-google-sheets-parser';
+
+const parser = publicGoogleSheetsParser(
+  new PublicGoogleSheetsParser(/* ... */),
+  {
+    publicGoogleSheetsParserInstance,
+    path: ['Key', 'Property'],
+    typeName: 'Type',
   },
-});
+);
 
 generateDts({
   name: 'GoogleSheets',
@@ -34,23 +36,18 @@ generateDts({
 #### `publicGoogleSheetsParser`
 
 ```ts
-function publicGoogleSheetsParser(options: {
-  spreadSheetId: string;
-  path: string[];
-  typeName: string;
-  publicGoogleSheetsParser: PublicGoogleSheetsParserOptions;
-}): Parser;
-
-type PublicGoogleSheetsParserOptions = {
-  sheetName: string;
-};
+function publicGoogleSheetsParser(
+  publicGoogleSheetsParserInstance: PublicGoogleSheetsParser,
+  params: {
+    path: string[];
+    typeName: string;
+  },
+): Parser;
 ```
 
-- `spreadSheetId`: Google Sheets ID
+- `publicGoogleSheetsParserInstance`: An instance of [`PublicGoogleSheetsParser`](https://github.com/fureweb-com/public-google-sheets-parser?tab=readme-ov-file#usage-example)
 - `path`: List of column names where object property names exists
 - `typeName`: Column name where the type name exists
-- `publicGoogleSheets`
-  - `sheetName`: Google Sheets sheet name
 
 For example, given the following Google Sheets:
 
diff --git a/src/parser/publicGoogleSheetsParser.ts b/src/parser/publicGoogleSheetsParser.ts
index a5c9e74..f329532 100644
--- a/src/parser/publicGoogleSheetsParser.ts
+++ b/src/parser/publicGoogleSheetsParser.ts
@@ -1,30 +1,20 @@
 // Parser for public-google-sheets-parser
 // https://github.com/fureweb-com/public-google-sheets-parser
 
-import PublicGoogleSheetsParser from 'public-google-sheets-parser';
+import type PublicGoogleSheetsParser from 'public-google-sheets-parser';
 
-type SheetName = string;
-type PublicGoogleSheetsParserOptions = { sheetName: SheetName };
-
-type Options = Partial<{
-  publicGoogleSheetsParser: PublicGoogleSheetsParserOptions;
-}>;
-
-type Params = {
-  spreadsheetId: string;
+type PublicGoogleSheetsParserParams = {
   path: string[];
   typeName: string;
-  options?: Options;
 };
 
 export const publicGoogleSheetsParser =
-  ({ spreadsheetId, path, typeName, options }: Params) =>
+  (
+    publicGoogleSheetsParserInstance: PublicGoogleSheetsParser,
+    { path, typeName }: PublicGoogleSheetsParserParams,
+  ) =>
   async (): Promise<object> => {
-    const parser = new PublicGoogleSheetsParser(
-      spreadsheetId,
-      options?.publicGoogleSheetsParser,
-    );
-    const data = await parser.parse();
+    const data = await publicGoogleSheetsParserInstance.parse();
 
     const filledData = data.map((item, index, data) => {
       if (index === 0) {