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ProseMirror
What ProseMirror is
ProseMirror is a toolkit for developers building rich-text editors on the web. It provides a WYSIWYG-style interface for structured documents while allowing applications to define their document shape and content rules. Rather than treating content as an HTML blob, it gives application code control over a custom document data structure. Schemas and plugins support customization, and the modular design lets applications choose or replace parts. Four essential modules handle the document model, editor state, view, and transformations; additional modules provide commands, key bindings, undo history, input macros, collaboration, and a basic schema. Multiple people can edit together in real time. Examples cover tasks such as Markdown editing, image uploads, code editors, footnotes, and track changes. ProseMirror is open source and legally free for commercial use. It is installed with npm and can be self-hosted. It is a customizable toolkit, not a ready-made editor component, and implementation generally involves a bundler. The GitHub repository says development moved to Forgejo.
Who it suits
It suits developers who need to build a web editor around structured documents and want control over the document model. It is less suited to someone seeking a ready-made component rather than a toolkit.
What it does well
- Allows applications to define custom document structures.
- Supports real-time collaborative editing.
- Plugin system can add custom functionality.
- Free for commercial use under the MIT license.
What to know first
- It is not a drop-in editor component.
- Implementation generally involves a bundler.
- GitHub repository says development moved to Forgejo.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| ProseMirror open-source library | commercial use legally permitted · install with npm | Free |
As prosemirror.net lists them, read 1 Oct 2026. The maker's own page has the final word.
Getting started
- Open the ProseMirror website.
- Install the library with npm.
- Use its schemas to define the document structure.
- Choose the core and additional modules for the editor.
- Use the official examples as a starting point for editor features.
Verdict
ProseMirror gives developers a modular base for structured, customizable web editors, including collaboration support. Its toolkit approach requires implementation work rather than providing a finished editor component.
Questions
How much does ProseMirror cost?
The listed ProseMirror open-source library plan is free. Commercial use is legally permitted.
Is ProseMirror open source?
Yes. The project is open source and is legally free to use commercially.
Which platforms does it support?
ProseMirror is for the web and can be self-hosted. It supports JavaScript and TypeScript projects.
Does it support collaborative editing?
Yes. The project includes support for multiple people editing in real time.
How do developers install it?
The official site identifies npm as the easiest installation route. Using the toolkit generally involves a bundler.
Is ProseMirror a complete editor component?
No. It is a modular toolkit intended as a customizable base for different kinds of editors.
Facts from ProseMirror's own pages
- Account security
- The discussion site's terms make account holders responsible for maintaining account security and activity under their accounts. · discuss.prosemirror.net, 1 Oct 2026
- Architecture
- ProseMirror is modular, pluggable, largely functional and immutable, and unopinionated. · prosemirror.net, 1 Oct 2026
- Browser support
- The library works on recent Firefox, Chrome, Safari, and Edge versions, as well as Internet Explorer 11. · prosemirror.net, 1 Oct 2026
- Bundling
- ProseMirror is not distributed as one browser-loadable script, so the guide says users will probably want a bundler. · prosemirror.net, 1 Oct 2026
- Collaboration
- It supports real-time collaborative editing, allowing multiple people to edit the same document simultaneously. · prosemirror.net, 1 Oct 2026
- Commercial use
- The project is open source and legally free to use commercially, while asking profitable users to help fund maintenance. · prosemirror.net, 1 Oct 2026
- Core
- The core library is small and generic and is intended as a base for different kinds of editors. · prosemirror.net, 1 Oct 2026
- Core modules
- Four essential modules are prosemirror-model, prosemirror-state, prosemirror-view, and prosemirror-transform. · prosemirror.net, 1 Oct 2026
- Document model
- The editor gives application code control over a custom document data structure rather than treating the document as an HTML blob. · prosemirror.net, 1 Oct 2026
- Editing model
- It provides a WYSIWYG-style interface for documents with constrained, structured content. · prosemirror.net, 1 Oct 2026
- Examples
- Official examples cover Markdown editing, image upload, custom schemas, menus, foldable nodes, code editors, linters, footnotes, track changes, and collaborative editing. · prosemirror.net, 1 Oct 2026
- Extensions
- Additional modules provide editing commands, key bindings, undo history, input macros, collaborative editing, and a basic document schema. · prosemirror.net, 1 Oct 2026
- Implementation limit
- The core library is not a drop-in component and is intended as a modular, customizable toolkit; using it generally involves a bundler. · prosemirror.net, 1 Oct 2026
- Installation
- The official site says the easiest way to install ProseMirror is with npm. · prosemirror.net, 1 Oct 2026
- License
- The project is released under the MIT license and the homepage says users are legally free to use it commercially. · github.com, 1 Oct 2026
- License terms
- The ProseMirror state package is released under the MIT License, which includes warranty and liability disclaimers. · github.com, 1 Oct 2026
- Modularity
- Its modular architecture lets applications load only the code they need and replace system parts. · prosemirror.net, 1 Oct 2026
- Plugins
- Its plugin system enables additional functionality and custom extensions. · prosemirror.net, 1 Oct 2026
- Purpose
- ProseMirror is a toolkit for building rich-text editors on the web. · prosemirror.net, 1 Oct 2026
- Repository status
- The GitHub repository says it is archived and that development has moved to Forgejo at code.haverbeke.berlin. · github.com, 1 Oct 2026
- Schemas
- Document schemas allow custom document structures without writing an editor from scratch. · prosemirror.net, 1 Oct 2026
- Security advisory
- An official forum advisory reports a viable cross-site-scripting risk affecting some uses of DOMSerializer. · discuss.prosemirror.net, 1 Oct 2026
- Structured documents
- It provides a WYSIWYG-style interface for constrained, structured documents and lets applications customize document shape and structure. · prosemirror.net, 1 Oct 2026
- Support
- The project directs questions and discussion to its forum and bugs to its issue tracker, with a code of conduct for communication. · prosemirror.net, 1 Oct 2026
Where ProseMirror stands on Freedom251
- Rich Text Editor Software#10 of 37