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kodemirror

Open source Apache-2.0 Kotlin
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JavaScript Libraries & Components

About kodemirror

Native Compose Multiplatform code editor — a Kotlin port of CodeMirror 6

Platforms

Web Self-hosted Android

Languages

Kotlin

Links

Website Source Code
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monkopedia
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README.md

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KodeMirror

CI Maven Central License

A native Compose Multiplatform code editor — no WebView, no JS bridges. Built as a ground-up Kotlin port of CodeMirror 6, the industry-standard web editor.

Live Demo · Documentation · API Reference

Why KodeMirror?

Compose Multiplatform doesn't ship a code editor. Your options are embedding a WebView (heavy, hard to integrate) or building from scratch. KodeMirror gives you a real Compose component with the full feature set of CodeMirror 6:

  • Syntax highlighting for 20+ languages, plus 100+ via legacy modes
  • Vim mode with 600+ ported upstream tests
  • Search/replace, autocompletion, linting, code folding
  • Collaborative editing and side-by-side diff/merge
  • Themes — One Dark, Dracula, GitHub Light, Material Design
  • Real keyboard input pipeline — layout-aware key handling, no platform hacks

All from shared Kotlin code across every Compose target.

Try the live demo to see it in action — syntax highlighting, vim mode, autocompletion, and more, all running in the browser.

Platform Support

Platform Status
wasmJs (Browser) Tested — automated gap tests + manual browser testing
JVM Desktop Unit tests pass, visual rendering lightly tested
Android Unit tests pass via CI, untested on devices
iOS / macOS native Compiles, experimental

Quick Start

// build.gradle.kts
kotlin {
    sourceSets {
        commonMain.dependencies {
            implementation(platform("com.monkopedia.kodemirror:kodemirror-bom:0.1.0"))
            implementation("com.monkopedia.kodemirror:view")
            implementation("com.monkopedia.kodemirror:commands")
            implementation("com.monkopedia.kodemirror:basic-setup")
            // Pick your language(s)
            implementation("com.monkopedia.kodemirror:lang-javascript")
        }
    }
}
@Composable
fun Editor() {
    val session = rememberEditorSession(
        doc = "function hello() {\n    return 'world';\n}",
        extensions = basicSetup + javascript().extension
    )
    KodeMirror(session = session, modifier = Modifier.fillMaxSize())
}

With Vim mode and a theme

@Composable
fun VimEditor() {
    val session = rememberEditorSession(
        doc = "println(\"Hello, KodeMirror!\")",
        extensions = basicSetup + kotlin().extension + vim() + oneDark
    )
    KodeMirror(session = session, modifier = Modifier.fillMaxSize())
}

Modules

Core

Module Description
state Editor state, transactions, selections, facets
view Compose UI component, decorations, key handling
language Language support infrastructure, syntax highlighting
commands Standard editor commands (cursor movement, delete, indent, undo/redo)
basic-setup Convenience bundle combining common extensions

Features

Module Description
search Find/replace panel, search commands
autocomplete Completion popup and sources
lint Diagnostic display and linting
collab Collaborative editing support
merge Side-by-side diff view
vim Vim keybindings and modal editing

Languages

JavaScript, TypeScript, HTML, CSS, Python, Java, Kotlin, Go, Rust, Markdown, JSON, YAML, XML, SQL, C++, PHP, and more — 20+ dedicated modules plus 100+ via legacy-modes.

Themes

One Dark, Dracula, GitHub Light, and Material Design integration.

Known Limitations

This is v0.1.0 — the API may evolve. Known issues to be aware of:

  • Single editor per window — multiple simultaneous KodeMirror instances share global state (#6)
  • Large files — parsing is synchronous, so very large documents may lag on keystroke (#7)
  • Mobile/native — Android and iOS targets compile and pass unit tests but are not battle-tested on real devices yet

See all open issues for the full list.

Contributing

Contributions are welcome! Please open an issue to discuss before submitting large changes.

License

Copyright 2026 Jason Monk

Licensed under the Apache License, Version 2.0

Originally based on CodeMirror 6 by Marijn Haverbeke, licensed under MIT. See NOTICE for details.