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YANG (yang-lsp)#

lsp-mode provides YANG language support via the TypeFox/yang-lsp Server. The server identifier is yls as an abbreviation of the released binary called yang-language-server.

Configuration#

Add following configuration in .emacs or init.el to hook lsp on YANG files, since yang-mode is the supported major mode.

(add-hook 'yang-mode-hook 'lsp)

It recommended to add following configuration for the yang.settings file, which resides at the user/project/workspace root, to be validated via lsp-json. This may be automated by lsp-yang in later stages.

(setq lsp-json-schemas
      `[(:fileMatch ["yang.settings"] :url lsp-yang-yls-settings-schema-url)])

To automatically trigger the lsp-json based validation, following configuration is recommended.

(add-hook 'jsonc-mode-hook 'lsp)

Known Issues#

  • Files in the project need to be opened in buffer to be known by LSP server
  • yang.settings is not associated with its JSON schema yang-lsp-settings-schema.json yet
  • yang-lsp settings file yang.settings is not respected
  • lsp-format-buffer does not follow yang-mode or yang.settings
  • Snippets have a bad format with extraneous characters
Last update: October 29, 2025