{"id":949,"date":"2026-07-08T05:51:38","date_gmt":"2026-07-08T05:51:38","guid":{"rendered":"https:\/\/www.vpascode.com\/in\/docs\/uncategorized\/mermaid-js-playbook\/mermaid-js-architecture-diagram-syntax-layout-guide-vpascode\/"},"modified":"2026-07-30T01:24:34","modified_gmt":"2026-07-30T01:24:34","slug":"mermaid-js-architecture-diagram-syntax-layout-guide","status":"publish","type":"ld_docs","link":"https:\/\/www.vpascode.com\/in\/docs\/vpascode-docs\/mermaid-js-playbook\/mermaid-js-architecture-diagram-syntax-layout-guide","title":{"rendered":"Mermaid.js Architecture Diagram Syntax & Layout Guide"},"content":{"rendered":"

An Architecture diagram provides a structured blueprint used by systems architects and DevOps teams to visualize infrastructure setups, cloud microservices, and structural layout configurations. Built on the architecture-beta<\/code> engine, this text-based tool replaces manual dragging utilities by auto-arranging structural service groups, database clusters, gateways, and edge paths into clean, predictable system layouts.<\/p>\n

Basic Syntax Structure<\/h2>\n

Every diagram starts with the architecture-beta<\/code> declaration header. You populate the canvas by defining individual node elements using the service<\/code> keyword, and map connection tracks by specifying exact directional coordinate ports (T<\/strong>op, B<\/strong>ottom, L<\/strong>eft, R<\/strong>ight) separated by colons and double dashes.<\/p>\n

\r\n
\r\n Mermaid<\/span>\r\n \r\n <\/path><\/path><\/svg>\r\n Edit Mermaid in VPasCode<\/span>\r\n <\/a>\r\n <\/div>\r\n
\r\n 
architecture-beta\r\n  service gateway(internet)[Gateway Label]\r\n  service server(server)[App Server]\r\n  \r\n  gateway:B -- T:server<\/code><\/pre>                <\/div>\r\n                
\r\n                    \r\n                        <\/path><\/path><\/svg>\r\n                        Edit Mermaid in VPasCode<\/span>\r\n                    <\/a>\r\n                <\/div>\r\n            <\/div>\r\n            \n
\"\"<\/p>\n
Syntax Reference<\/h2>\n
The table below breaks down the primary data components, formatting keywords, and connector attributes used to construct an architecture workspace map in Mermaid.js.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Syntax Component<\/th>\nType Requirement<\/th>\nDescription & Usage Rules<\/th>\n<\/tr>\n<\/thead>\n
Declaration<\/strong><\/td>\nKeyword Identifier<\/td>\nInitializes the infrastructure mapping workspace canvas. Must use the exact architecture-beta<\/code> block.<\/td>\n<\/tr>\n
Service Node<\/strong><\/td>\nKeyword + Identity Block<\/td>\nDeclares an architectural entity. Uses the syntax: service id(icon)[Display Label]<\/code>.<\/td>\n<\/tr>\n
Group Wrapper<\/strong><\/td>\nContainer Keyword<\/td>\nGroups related services inside a visual container. Uses the syntax: group id(icon)[Group Label]<\/code>.<\/td>\n<\/tr>\n
In Keyword<\/strong><\/td>\nAssignment Modifier<\/td>\nExplicitly assigns a service node to reside inside a specific declared group wrapper: service id(icon)[Label] in groupId<\/code>.<\/td>\n<\/tr>\n
Junction Node<\/strong><\/td>\nKeyword Identifier<\/td>\nEstablishes a structural alignment hub point used to neatly route complex, multi-directional link paths: junction id<\/code>.<\/td>\n<\/tr>\n
Connection Edges<\/strong><\/td>\nPort Direction Operators<\/td>\nConfigures directional tracking paths by pinning the link to specific node sides (T, B, L, R): source:side -- side:target<\/code>. Supports directional arrow tips (--><\/code>).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
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Advanced Grouping & Port Edge Routing<\/h2>\n
To control exactly how links travel between elements without looking messy, the architecture engine requires explicit port bindings. Related nodes can be organized inside structural groups to clarify system boundaries.<\/p>\n
1. Exact Port Binding Rules<\/h3>\n
You define where a connection line leaves and enters a component by appending a colon and an edge direction flag (T<\/code>, B<\/code>, L<\/code>, R<\/code>) to the respective node identifiers:<\/p>\n