--- author: Mermaid Team title: Mermaid Diagrams date: 2021-07-18T10:52:59+08:00 description: A brief guide to Mermaid syntax. mermaid: true tags: - markdown - mermaid --- ## Examples The following are some examples of the diagrams, charts and graphs that can be made using Mermaid. Click here to jump into the [full syntax](http://mermaid-js.github.io/mermaid/). ### Flowchart ``` flowchart LR A[Hard] -->|Text| B(Round) B --> C{Decision} C -->|One| D[Result 1] C -->|Two| E[Result 2] ``` ```mermaid flowchart LR A[Hard] -->|Text| B(Round) B --> C{Decision} C -->|One| D[Result 1] C -->|Two| E[Result 2] ``` ### Sequence diagram ``` sequenceDiagram Alice->>John: Hello John, how are you? loop Healthcheck John->>John: Fight against hypochondria end Note right of John: Rational thoughts! John-->>Alice: Great! John->>Bob: How about you? Bob-->>John: Jolly good! ``` ```mermaid sequenceDiagram Alice->>John: Hello John, how are you? loop Healthcheck John->>John: Fight against hypochondria end Note right of John: Rational thoughts! John-->>Alice: Great! John->>Bob: How about you? Bob-->>John: Jolly good! ``` ### Gantt chart ``` gantt section Section Completed :done, des1, 2014-01-06,2014-01-08 Active :active, des2, 2014-01-07, 3d Parallel 1 : des3, after des1, 1d Parallel 2 : des4, after des1, 1d Parallel 3 : des5, after des3, 1d Parallel 4 : des6, after des4, 1d ``` ```mermaid gantt section Section Completed :done, des1, 2014-01-06,2014-01-08 Active :active, des2, 2014-01-07, 3d Parallel 1 : des3, after des1, 1d Parallel 2 : des4, after des1, 1d Parallel 3 : des5, after des3, 1d Parallel 4 : des6, after des4, 1d ``` ### Class diagram ``` classDiagram Class01 <|-- AveryLongClass : Cool <> Class01 Class09 --> C2 : Where am I? Class09 --* C3 Class09 --|> Class07 Class07 : equals() Class07 : Object[] elementData Class01 : size() Class01 : int chimp Class01 : int gorilla class Class10 { <> int id size() } ``` ```mermaid classDiagram Class01 <|-- AveryLongClass : Cool <> Class01 Class09 --> C2 : Where am I? Class09 --* C3 Class09 --|> Class07 Class07 : equals() Class07 : Object[] elementData Class01 : size() Class01 : int chimp Class01 : int gorilla class Class10 { <> int id size() } ``` ### State diagram ``` stateDiagram-v2 [*] --> Still Still --> [*] Still --> Moving Moving --> Still Moving --> Crash Crash --> [*] ``` ```mermaid stateDiagram-v2 [*] --> Still Still --> [*] Still --> Moving Moving --> Still Moving --> Crash Crash --> [*] ``` ### Pie chart ``` pie "Dogs" : 386 "Cats" : 85.9 "Rats" : 15 ``` ```mermaid pie "Dogs" : 386 "Cats" : 85.9 "Rats" : 15 ``` ### User Journey diagram ``` journey title My working day section Go to work Make tea: 5: Me Go upstairs: 3: Me Do work: 1: Me, Cat section Go home Go downstairs: 5: Me Sit down: 3: Me ``` ```mermaid journey title My working day section Go to work Make tea: 5: Me Go upstairs: 3: Me Do work: 1: Me, Cat section Go home Go downstairs: 5: Me Sit down: 3: Me ``` ### C4 diagram ``` C4Context title System Context diagram for Internet Banking System Person(customerA, "Banking Customer A", "A customer of the bank, with personal bank accounts.") Person(customerB, "Banking Customer B") Person_Ext(customerC, "Banking Customer C") System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.") Person(customerD, "Banking Customer D", "A customer of the bank,
with personal bank accounts.") Enterprise_Boundary(b1, "BankBoundary") { SystemDb_Ext(SystemE, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.") System_Boundary(b2, "BankBoundary2") { System(SystemA, "Banking System A") System(SystemB, "Banking System B", "A system of the bank, with personal bank accounts.") } System_Ext(SystemC, "E-mail system", "The internal Microsoft Exchange e-mail system.") SystemDb(SystemD, "Banking System D Database", "A system of the bank, with personal bank accounts.") Boundary(b3, "BankBoundary3", "boundary") { SystemQueue(SystemF, "Banking System F Queue", "A system of the bank, with personal bank accounts.") SystemQueue_Ext(SystemG, "Banking System G Queue", "A system of the bank, with personal bank accounts.") } } BiRel(customerA, SystemAA, "Uses") BiRel(SystemAA, SystemE, "Uses") Rel(SystemAA, SystemC, "Sends e-mails", "SMTP") Rel(SystemC, customerA, "Sends e-mails to") ``` ```mermaid C4Context title System Context diagram for Internet Banking System Person(customerA, "Banking Customer A", "A customer of the bank, with personal bank accounts.") Person(customerB, "Banking Customer B") Person_Ext(customerC, "Banking Customer C") System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.") Person(customerD, "Banking Customer D", "A customer of the bank,
with personal bank accounts.") Enterprise_Boundary(b1, "BankBoundary") { SystemDb_Ext(SystemE, "Mainframe Banking System", "Stores all of the core banking information about customers, accounts, transactions, etc.") System_Boundary(b2, "BankBoundary2") { System(SystemA, "Banking System A") System(SystemB, "Banking System B", "A system of the bank, with personal bank accounts.") } System_Ext(SystemC, "E-mail system", "The internal Microsoft Exchange e-mail system.") SystemDb(SystemD, "Banking System D Database", "A system of the bank, with personal bank accounts.") Boundary(b3, "BankBoundary3", "boundary") { SystemQueue(SystemF, "Banking System F Queue", "A system of the bank, with personal bank accounts.") SystemQueue_Ext(SystemG, "Banking System G Queue", "A system of the bank, with personal bank accounts.") } } BiRel(customerA, SystemAA, "Uses") BiRel(SystemAA, SystemE, "Uses") Rel(SystemAA, SystemC, "Sends e-mails", "SMTP") Rel(SystemC, customerA, "Sends e-mails to") ```