Awesome
Syntax highlighting for ER Diagrams
Syntax support in Visual Studio Code for Entity-Relationship Diagram files (.er files) with highlighting for entities, primary keys, comments and more. This has been designed around Material Theme so stylings might appear different depending on theme.
Preview
Syntax
This is based on the syntax used by erd-go but also supports cardinalities used by erd and erdm.
Markdown
This extension also provides syntax highlighting and previewing of ER code in Markdown.