TOML Schema Language Server Protocol (LSP) written in Rust, and VS Code extension. Using TOML Schema by @brunoborges.

Features

TOML Schema Validation: Full compliance with, and using the TOML Schema specification.
Real-Time Diagnostics: Validates TOML files on the fly as you type.
Local Schema Support: Uses local .tosd files to define schemas.

Limitations

TOML Version: TOML Schema is currently based strictly on TOML 1.0.0.
Error Positioning: The underlying Rust implementation of TOML Schema validation currently only returns paths and string messages, no error type/tokens. Because of this, editor diagnostics/errors are placed directly on item values rather than pinpointing specific syntax tokens.

Automatic TOSD Validation: Implement validation for .tosd files using TOML Schema's Self-Schema.
Caching: Implement caching (and file watching) for .tosd files to prevent re-fetching (disk I/O) on every modification.
Remote Schema Support: Add support for remote .tosd URLs to improve UX (currently restricted as the current implementation supports only local files).

The project consists of a Rust backend LSP server, and a TypeScript VS Code extension client.

To develop locally, start file watchers for both the frontend and backend:

# Watch and build the VS Code client
npm run dev

# Watch and run the Rust LSP server
cargo watch -x run

note: In development, these communicate via TCP server (localhost:9260) as opposed to stdin/stdout.

Open this project in VS Code, press F5 and select "VS Code Extension Development" debugger to launch a host window with the extension active.

To package the VS Code extension into a .vsix bundle:

npx @vscode/vsce package