# How to Render LaTeX/KaTeX Math Equations in Tiptap: A Complete Guide

> Learn to render LaTeX KaTeX math equations in Tiptap with our complete guide. Discover client-side solutions for Tiptap using custom node views and real-time previews.

- Repository: [Hung Hoang/reactjs-tiptap-editor](https://github.com/hunghg255/reactjs-tiptap-editor)
- Tags: how-to-guide
- Published: 2026-03-03

---

**The Katex extension in `reactjs-tiptap-editor` provides a complete client-side solution for rendering LaTeX/KaTeX mathematics inside Tiptap using a custom node view, toolbar dialog, and real-time preview capabilities.**

The `reactjs-tiptap-editor` package ships with a dedicated Katex extension that enables first-class LaTeX math support without external dependencies beyond the official KaTeX library. This extension implements a full-stack rendering pipeline that handles everything from input parsing to HTML generation, allowing users to write mathematical expressions using standard LaTeX syntax directly within the editor.

## Architecture of the Katex Extension

The implementation follows a three-layer architecture that separates data modeling, rendering logic, and user interface concerns.

### Extension Definition Layer

The core extension logic resides in [[`src/extensions/Katex/Katex.ts`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/Katex.ts)](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/Katex.ts). This file declares an inline node named `katex` that stores two HTML attributes: `text` (the LaTeX expression) and `macros` (optional macro definitions). It registers a `setKatex` command, an input rule triggered by `$katex$`, and a React node view factory.

### React Node View Layer

[[`src/extensions/Katex/components/KatexWrapper.tsx`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/components/KatexWrapper.tsx)](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/components/KatexWrapper.tsx) implements the `KatexNodeView` component. This component retrieves the stored LaTeX string from node attributes, processes it through `katex.renderToString`, and injects the generated HTML using `dangerouslySetInnerHTML`. The resulting `span.katex` element is draggable, selectable, and editable.

### Toolbar UI Layer

The user interface is provided by [[`src/extensions/Katex/components/RichTextKatex.tsx`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/components/RichTextKatex.tsx)](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/components/RichTextKatex.tsx). This component renders a toolbar button that opens a modal dialog where users can input LaTeX expressions and define macros. The dialog features a real-time preview using the same KaTeX engine (v0.16.27) as the node view.

### Data Flow

When a user inserts a formula:

1. The toolbar dialog captures the LaTeX expression and optional macros
2. The dialog executes `editor.chain().focus().setKatex({ text, macros }).run()`
3. The `setKatex` command inserts a `katex` node with encoded attributes
4. The React node view decodes attributes and calls `katex.renderToString`
5. The rendered HTML appears as an inline, draggable element in the editor

## Implementation Guide

Follow these steps to enable LaTeX/KaTeX math equations in your Tiptap editor.

### Install Dependencies

While `reactjs-tiptap-editor` includes `katex` (v0.16.27) as a dependency, you must manually import the CSS and ensure peer dependencies are available:

```bash
npm install katex @tiptap/react @tiptap/core

```

### Import the Extension and Styles

Import the Katex extension, toolbar component, and required CSS:

```tsx
import { Katex, RichTextKatex } from 'reactjs-tiptap-editor/katex';
import 'katex/dist/katex.min.css';

```

### Configure Editor Extensions

Add `Katex` to your Tiptap extensions array:

```tsx
import { useEditor } from '@tiptap/react';
import { Document, Text, Paragraph } from '@tiptap/extensions';
import { Katex } from 'reactjs-tiptap-editor/katex';

const editor = useEditor({
  extensions: [
    Document,
    Text,
    Paragraph,
    // other extensions...
    Katex,
  ],
  content: '',
});

```

### Add the Toolbar Button

Render the `RichTextKatex` component within your toolbar to provide the LaTeX input dialog:

```tsx
const RichTextToolbar = () => (
  <>
    {/* other toolbar buttons */}
    <RichTextKatex />
  </>
);

```

### Usage Examples

Users can enter various LaTeX expressions through the dialog:

- **Simple equation**: `E = mc^2` renders as *E = mc²*
- **Integral**: `\int_{0}^{\infty} e^{-x} dx = 1` renders the corresponding integral notation
- **Custom macros**: `\newcommand{\R}{\mathbb{R}} \R` renders the real number symbol ℝ

The dialog's `previewContent` updates in real-time using the same rendering logic as the node view, ensuring WYSIWYG accuracy before insertion.

## Key Implementation Files

Understanding these source files helps with customization and debugging:

- **[`src/extensions/Katex/Katex.ts`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/Katex.ts)**: Defines the `katex` node schema, `setKatex` command, and input rules
- **[`src/extensions/Katex/components/KatexWrapper.tsx`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/components/KatexWrapper.tsx)**: React node view that executes `katex.renderToString` and manages DOM insertion
- **[`src/extensions/Katex/components/RichTextKatex.tsx`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/components/RichTextKatex.tsx)**: Toolbar button and modal dialog with real-time preview
- **[`docs/extensions/Katex/index.md`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/docs/extensions/Katex/index.md)**: Official documentation with import syntax and configuration examples

## Summary

- **Import path**: Use `reactjs-tiptap-editor/katex` for both the extension and toolbar components
- **Required CSS**: Always import [`katex/dist/katex.min.css`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/katex/dist/katex.min.css) for proper equation styling
- **Command API**: Insert equations via `editor.chain().focus().setKatex({ text, macros }).run()`
- **Real-time preview**: The toolbar dialog provides live KaTeX rendering before insertion
- **Node attributes**: The extension stores LaTeX source in `text` and macro definitions in `macros` attributes
- **File locations**: Core logic is in [`src/extensions/Katex/Katex.ts`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/Katex.ts) with UI components in the `components/` subdirectory

## Frequently Asked Questions

### How do I edit an existing KaTeX equation in the editor?

Double-click or select the rendered equation node and click the Katex toolbar button. The dialog will reopen with the current `text` and `macros` values pre-populated, allowing you to modify the LaTeX source and update the rendering via the `setKatex` command.

### Does this extension support both inline and block equations?

Yes. The `katex` node is defined as an inline node in [`src/extensions/Katex/Katex.ts`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/src/extensions/Katex/Katex.ts), but it can be configured for block contexts by modifying the node specification or using Tiptap's node wrapping commands. The underlying `katex.renderToString` method handles both display and inline math modes based on the LaTeX syntax provided.

### Why is my equation not rendering after installation?

Ensure you have imported the KaTeX CSS file (`import 'katex/dist/katex.min.css'`). Without this stylesheet, the HTML generated by `katex.renderToString` in [`KatexWrapper.tsx`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/KatexWrapper.tsx) will lack the necessary fonts and positioning rules. Also verify that the `Katex` extension is included in your Tiptap extensions array.

### Can I define custom LaTeX macros?

Yes. The `setKatex` command accepts a `macros` object parameter that gets stored in the node's HTML attributes. These macros are passed to `katex.renderToString` in [`KatexWrapper.tsx`](https://github.com/hunghg255/reactjs-tiptap-editor/blob/main/KatexWrapper.tsx), allowing you to define reusable commands like `\newcommand{\R}{\mathbb{R}}` that persist with the specific equation node.