LSP4IJ

LSP4IJ is a free and open-source

• Language Server protocol (LSP) client compatible with all flavors of IntelliJ.
• Debug Adapter Protocol support with Debug Adapter Protocol Run/Debug configuration.

It allows you to integrate any language server that communicates with its client via stdio:

• by developing an IntelliJ plugin with LSP extension points:
  • com.redhat.devtools.lsp4ij.server extension point to define a language server.
  • com.redhat.devtools.lsp4ij.languageMapping to associate an IntelliJ language with a language server definition.
• by manually adding language server definitions, supporting custom server settings. This approach doesn't require developing a specific IntelliJ plugin.

LSP4IJ also provides:

• An LSP Consoles view to track LSP requests, responses, and notifications in a console.
• A Language Servers preferences page to configure the LSP trace level and the debug port to use to debug the language server.

You can find more documentation in:

• the developer guide , providing step-by-step instructions on how to integrate a language server in LSP4IJ, in an external IntelliJ plugin.
• the User-defined language server documentation , explaining how to integrate a language server in LSP4IJ with a few settings.
• the user guide, explaining how to use the LSP console and Language Server preferences.
• the LSP Support overview, describing which LSP features are implemented, and how.