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# Custom extensions
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## toc
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## Introduction
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One of the strength of tiptap is it’s extendability. You don’t depend on the provided extensions, it’s intended to extend the editor to your liking. With custom extensions you can add new content types and new functionalities, on top of what already exists or on top of that.
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## Option 1: Change defaults
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Let’s say you want to change the keyboard shortcuts for the bullet list. You should start by looking at [the source code of the `BulletList` extension](https://github.com/ueberdosis/tiptap-next/blob/main/packages/extension-bullet-list/index.ts) and find the default you’d like to change. In that case, the keyboard shortcut, and just that.
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```js
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// 1. Import the extension
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import BulletList from '@tiptap/extension-bullet-list'
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// 2. Overwrite the keyboard shortcuts
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const CustomBulletList = BulletList()
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.keys(({ editor }) => ({
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'Mod-l': () => editor.bulletList(),
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}))
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.create() // Don’t forget that!
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// 3. Add the custom extension to your editor
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new Editor({
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extensions: [
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CustomBulletList(),
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// …
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]
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})
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```
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You can overwrite every aspect of an existing extension:
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### Name
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```js
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import Document from '@tiptap/extension-document'
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const CustomDocument = Document()
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.name('doc')
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.create()
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```
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### Settings
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```js
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import Heading from '@tiptap/extension-heading'
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const CustomHeading = Heading()
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.defaults({
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levels: [1, 2, 3],
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class: 'my-custom-heading',
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})
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.create()
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```
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### Schema
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```js
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import Code from '@tiptap/extension-code'
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const CustomCode = Code()
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.schema(() => ({
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excludes: '_',
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parseDOM: [
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{ tag: 'code' },
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],
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toDOM: () => ['code', { 'data-attribute': 'foobar' }, 0],
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}))
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.create()
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```
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### Commands
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```js
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import Paragraph from '@tiptap/extension-paragraph'
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const CustomParagraph = Paragraph()
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.commands(() => ({
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paragraph: () => ({ commands }) => {
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return commands.toggleBlockType(name, 'paragraph')
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},
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}))
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.create()
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```
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### Keyboard shortcuts
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```js
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import BulletList from '@tiptap/extension-bullet-list'
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const CustomBulletList = BulletList()
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.keys(({ editor }) => ({
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'Mod-l': () => editor.bulletList(),
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}))
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.create()
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```
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### Input rules
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```js
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import Strike from '@tiptap/extension-strike'
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import { markInputRule } from '@tiptap/core'
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const inputRegex = /(?:^|\s)((?:~)((?:[^~]+))(?:~))$/gm
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const CustomStrike = Strike()
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.inputRules(({ type }) => [
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markInputRule(inputRegex, type),
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])
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.create()
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```
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### Paste rules
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```js
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import Underline from '@tiptap/extension-underline'
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import { markPasteRule } from '@tiptap/core'
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const pasteRegex = /(?:^|\s)((?:~)((?:[^~]+))(?:~))$/gm
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const CustomUnderline = Underline()
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.pasteRules(({ type }) => [
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markPasteRule(pasteRegex, type),
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])
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.create()
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```
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## Option 2: Extend existing extensions
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## Option 3: Start from scratch
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### 1. Read the documentation
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Although tiptap tries to hide most of the complexity of ProseMirror, it’s built on top of its APIs and we recommend you to read through the [ProseMirror Guide](https://ProseMirror.net/docs/guide/) for advanced usage. You’ll have a better understanding of how everything works under the hood and get more familiar with many terms and jargon used by tiptap.
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### 2. Have a look at existing extensions
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### 3. Get started
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### 4. Ask questions
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### 5. Publish a community extension
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