zed-mojo

A Zed editor extension for the Mojo programming language.

What It Does

• Syntax highlighting for .mojo and .🔥 files
• Code completion, diagnostics, and hover documentation via mojo-lsp-server
• Auto-indentation and bracket matching
• Code outline in the symbols panel (fn, def, struct, class, trait)
• Vim text object support

How to Use

Prerequisites

Install the Mojo SDK so that mojo-lsp-server is available.

The extension finds the LSP server automatically in this order:

1. PATH — works if mojo-lsp-server is globally available
2. Pixi — detects pixi.toml in the project and uses .pixi/envs/default/bin/mojo-lsp-server
3. MODULAR_HOME — uses $MODULAR_HOME/pkg/packages.modular.com_mojo/bin/mojo-lsp-server
4. Default — falls back to ~/.modular/pkg/packages.modular.com_mojo/bin/mojo-lsp-server

If none of these work, set the path manually in Zed settings (Cmd+,):

{
  "lsp": {
    "mojo-lsp-server": {
      "binary": {
        "path": "/path/to/mojo-lsp-server"
      }
    }
  }
}

Using with Pixi

If your project uses pixi:

pixi add max

The extension will detect pixi.toml and use the pixi environment's mojo-lsp-server automatically.

How to Build

Requirements

• Rust toolchain

Setup, Build, and Install

# One-time: install the wasm target
make setup

# Build the extension
make build

# Or build + see install instructions
make dev

Then in Zed: Cmd+Shift+P → zed: install dev extension → select this directory.

Credits

• Tree-sitter grammar: lsh/tree-sitter-mojo
• Reference: modular/vscode-mojo