Mermaid

The mermaid shortcode generates diagrams and flowcharts from text in a similar manner as Markdown using the Mermaid library.

graph LR;
  If --> Then
  Then --> Else

Usage

```mermaid {align="center" zoom="true"}
graph LR;
  If --> Then
  Then --> Else
```

{{< mermaid align="center" zoom="true" >}}
graph LR;
  If --> Then
  Then --> Else
{{< /mermaid >}}

{{ partial "shortcodes/mermaid.html" (dict
  "page"    .
  "content" "graph LR;\n  If --> Then\n  Then --> Else"
  "align"   "center"
  "zoom"    "true"
)}}

Codefence syntax is widely available in other Markdown parsers like GitHub and therefore is the recommend syntax for generating portable Markdown.

Parameter

Name	Default	Notes
align	`center`	The vertical alignment. Allowed values are `left`, `center` or `right`.
zoom	see notes	Whether the graph is pan- and zoomable. If not set the value is determined by the `mermaidZoom` setting of your configurations options or the pages front matter or `false` if not set at all. - `false`: no pan or zoom - `true`: pan and zoom active
<content>	<empty>	Your Mermaid graph.

Settings

Configuring Pan and Zoom

Option Front Matter The generated graphs can be panned by dragging them and zoomed by using the mousewheel. On mobile devices you can use finger gestures.

By default this is disabled. Set mermaidZoom=true to enable it.

Individual settings of a graphs zoom parameter have precedence over the page’s front matter and configuration options in that order.

mermaidZoom = true

mermaidZoom: true

{
   "mermaidZoom": true
}

Providing Initialization Options for the Mermaid Library

Option Front Matter The Mermaid library is configured with default settings for initialization.

You can overwrite the settings by providing a JSON object in mermaidInitialize. See Mermaid’s documentation for all allowed settings.

Keep in mind that initialization settings of your pages front matter overwrite all settings of your configuration options.

In addition, you can merge settings for each individual graph through diagram directives on top of the settings of your page’s front matter or configuration options.

mermaidInitialize = '{ "securityLevel": "loose" }'

mermaidInitialize: '{ "securityLevel": "loose" }'

{
   "mermaidInitialize": "{ \"securityLevel\": \"loose\" }"
}

Loading an External Version of the Mermaid Library

Option Front Matter The theme uses the shipped Mermaid library by default.

In case you want do use a different version of the Mermaid library but don’t want to override the shipped version, you can set customMermaidURL to the URL of the external Mermaid library.

customMermaidURL = 'https://unpkg.com/mermaid/dist/mermaid.min.js'

customMermaidURL: https://unpkg.com/mermaid/dist/mermaid.min.js

{
   "customMermaidURL": "https://unpkg.com/mermaid/dist/mermaid.min.js"
}

Force Loading of the Mermaid Library

Option Front Matter The Mermaid library will be loaded if the page contains an mermaid shortcode or codefence.

You can force loading the Mermaid library if no shortcode or codefence was used by setting mermaid.force=true. If a shortcode or codefence was found, this option has no effect. This comes handy in case you are using scripting to render a graph.

[mermaid]
  force = true

mermaid:
  force: true

{
   "mermaid": {
      "force": true
   }
}

Setting a Specific Mermaid Theme

While you can configure the Mermaid theme to render your graph by using one of the initialization options, the recommended way is to set the default value using the --MERMAID-theme variable in your color variant stylesheet. This allows your graphs to look pretty when the user switches the color variant.

Examples

Flowchart with YAML-Title

```mermaid
---
title: Example Diagram
---
graph LR;
  A[Hard edge] -->|Link text| B(Round edge)
  B --> C{<strong>Decision</strong>}
  C -->|One| D[Result one]
  C -->|Two| E[Result two]
```

---
title: Example Diagram
---
graph LR;
  A[Hard edge] -->|Link text| B(Round edge)
  B --> C{<strong>Decision</strong>}
  C -->|One| D[Result one]
  C -->|Two| E[Result two]

Sequence Diagram with Configuration Directive

```mermaid
%%{init:{"fontFamily":"monospace", "sequence":{"showSequenceNumbers":true}}}%%
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!
```

%%{init:{"fontFamily":"monospace", "sequence":{"showSequenceNumbers":true}}}%%
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!

Class Diagram

```mermaid
classDiagram
  Animal <|-- Duck
  Animal <|-- Fish
  Animal <|-- Zebra
  Animal : +int age
  Animal : +String gender
  Animal: +isMammal()
  Animal: +mate()
  class Duck{
    +String beakColor
    +swim()
    +quack()
  }
  class Fish{
    -int sizeInFeet
    -canEat()
  }
  class Zebra{
    +bool is_wild
    +run()
  }
```

classDiagram
  Animal <|-- Duck
  Animal <|-- Fish
  Animal <|-- Zebra
  Animal : +int age
  Animal : +String gender
  Animal: +isMammal()
  Animal: +mate()
  class Duck{
    +String beakColor
    +swim()
    +quack()
  }
  class Fish{
    -int sizeInFeet
    -canEat()
  }
  class Zebra{
    +bool is_wild
    +run()
  }

State Diagram Aligned to the Right Using Shortcode Syntax

{{< mermaid align="right" >}}
stateDiagram-v2
  open: Open Door
  closed: Closed Door
  locked: Locked Door
  open   --> closed: Close
  closed --> locked: Lock
  locked --> closed: Unlock
  closed --> open: Open
{{< /mermaid >}}

stateDiagram-v2
  open: Open Door
  closed: Closed Door
  locked: Locked Door
  open   --> closed: Close
  closed --> locked: Lock
  locked --> closed: Unlock
  closed --> open: Open

Entity Relationship Model with Non-Default Mermaid Theme

```mermaid
%%{init:{"theme":"forest"}}%%
erDiagram
  CUSTOMER }|..|{ DELIVERY-ADDRESS : has
  CUSTOMER ||--o{ ORDER : places
  CUSTOMER ||--o{ INVOICE : "liable for"
  DELIVERY-ADDRESS ||--o{ ORDER : receives
  INVOICE ||--|{ ORDER : covers
  ORDER ||--|{ ORDER-ITEM : includes
  PRODUCT-CATEGORY ||--|{ PRODUCT : contains
  PRODUCT ||--o{ ORDER-ITEM : "ordered in"
```

%%{init:{"theme":"forest"}}%%
erDiagram
  CUSTOMER }|..|{ DELIVERY-ADDRESS : has
  CUSTOMER ||--o{ ORDER : places
  CUSTOMER ||--o{ INVOICE : "liable for"
  DELIVERY-ADDRESS ||--o{ ORDER : receives
  INVOICE ||--|{ ORDER : covers
  ORDER ||--|{ ORDER-ITEM : includes
  PRODUCT-CATEGORY ||--|{ PRODUCT : contains
  PRODUCT ||--o{ ORDER-ITEM : "ordered in"

User Journey

```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
```

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

GANTT Chart

```mermaid
gantt
  dateFormat  YYYY-MM-DD
  title Adding GANTT diagram functionality to Mermaid
  section A section
  Completed task            :done,    des1, 2014-01-06,2014-01-08
  Active task               :active,  des2, 2014-01-09, 3d
  Future task               :         des3, after des2, 5d
  Future task2              :         des4, after des3, 5d
  section Critical tasks
  Completed task in the critical line :crit, done, 2014-01-06,24h
  Implement parser and jison          :crit, done, after des1, 2d
  Create tests for parser             :crit, active, 3d
  Future task in critical line        :crit, 5d
  Create tests for renderer           :2d
  Add to Mermaid                      :1d
```

gantt
  dateFormat  YYYY-MM-DD
  title Adding GANTT diagram functionality to Mermaid
  section A section
  Completed task            :done,    des1, 2014-01-06,2014-01-08
  Active task               :active,  des2, 2014-01-09, 3d
  Future task               :         des3, after des2, 5d
  Future task2              :         des4, after des3, 5d
  section Critical tasks
  Completed task in the critical line :crit, done, 2014-01-06,24h
  Implement parser and jison          :crit, done, after des1, 2d
  Create tests for parser             :crit, active, 3d
  Future task in critical line        :crit, 5d
  Create tests for renderer           :2d
  Add to Mermaid                      :1d

Pie Chart without Zoom

```mermaid {zoom="false"}
pie title Pets adopted by volunteers
  "Dogs" : 386
  "Cats" : 85
  "Rats" : 15
```

pie title Pets adopted by volunteers
  "Dogs" : 386
  "Cats" : 85
  "Rats" : 15

Quadrant Chart

```mermaid
quadrantChart
  title Reach and engagement of campaigns
  x-axis Low Reach --> High Reach
  y-axis Low Engagement --> High Engagement
  quadrant-1 We should expand
  quadrant-2 Need to promote
  quadrant-3 Re-evaluate
  quadrant-4 May be improved
  Campaign A: [0.3, 0.6]
  Campaign B: [0.45, 0.23]
  Campaign C: [0.57, 0.69]
  Campaign D: [0.78, 0.34]
  Campaign E: [0.40, 0.34]
  Campaign F: [0.35, 0.78]
```

quadrantChart
  title Reach and engagement of campaigns
  x-axis Low Reach --> High Reach
  y-axis Low Engagement --> High Engagement
  quadrant-1 We should expand
  quadrant-2 Need to promote
  quadrant-3 Re-evaluate
  quadrant-4 May be improved
  Campaign A: [0.3, 0.6]
  Campaign B: [0.45, 0.23]
  Campaign C: [0.57, 0.69]
  Campaign D: [0.78, 0.34]
  Campaign E: [0.40, 0.34]
  Campaign F: [0.35, 0.78]

Requirement Diagram

```mermaid
requirementDiagram

  requirement test_req {
    id: 1
    text: the test text.
    risk: high
    verifymethod: test
  }

  element test_entity {
    type: simulation
  }

  test_entity - satisfies -> test_req
```

requirementDiagram

  requirement test_req {
    id: 1
    text: the test text.
    risk: high
    verifymethod: test
  }

  element test_entity {
    type: simulation
  }

  test_entity - satisfies -> test_req

Git Graph

```mermaid
gitGraph
  commit
  commit
  branch develop
  checkout develop
  commit
  commit
  checkout main
  merge develop
  commit
  commit
```

gitGraph
  commit
  commit
  branch develop
  checkout develop
  commit
  commit
  checkout main
  merge develop
  commit
  commit

C4 Diagrams

```mermaid
C4Context
  title System Context diagram for Internet Banking System
  Enterprise_Boundary(b0, "BankBoundary0") {
    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", "desc")
    Person(customerD, "Banking Customer D", "A customer of the bank, <br/> with personal bank accounts.")

    System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.")

    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. next line.")
      }

      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.")
        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")

  UpdateElementStyle(customerA, $fontColor="red", $bgColor="grey", $borderColor="red")
  UpdateRelStyle(customerA, SystemAA, $textColor="blue", $lineColor="blue", $offsetX="5")
  UpdateRelStyle(SystemAA, SystemE, $textColor="blue", $lineColor="blue", $offsetY="-10")
  UpdateRelStyle(SystemAA, SystemC, $textColor="blue", $lineColor="blue", $offsetY="-40", $offsetX="-50")
  UpdateRelStyle(SystemC, customerA, $textColor="red", $lineColor="red", $offsetX="-50", $offsetY="20")

  UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")
```

C4Context
  title System Context diagram for Internet Banking System
  Enterprise_Boundary(b0, "BankBoundary0") {
    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", "desc")
    Person(customerD, "Banking Customer D", "A customer of the bank, <br/> with personal bank accounts.")

    System(SystemAA, "Internet Banking System", "Allows customers to view information about their bank accounts, and make payments.")

    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. next line.")
      }

      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.")
        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")

  UpdateElementStyle(customerA, $fontColor="red", $bgColor="grey", $borderColor="red")
  UpdateRelStyle(customerA, SystemAA, $textColor="blue", $lineColor="blue", $offsetX="5")
  UpdateRelStyle(SystemAA, SystemE, $textColor="blue", $lineColor="blue", $offsetY="-10")
  UpdateRelStyle(SystemAA, SystemC, $textColor="blue", $lineColor="blue", $offsetY="-40", $offsetX="-50")
  UpdateRelStyle(SystemC, customerA, $textColor="red", $lineColor="red", $offsetX="-50", $offsetY="20")

  UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")

Mindmaps

```mermaid
mindmap
  root((mindmap))
    Origins
      Long history
      ::icon(fa fa-book)
      Popularisation
        British popular psychology author Tony Buzan
    Research
      On effectiveness<br/>and features
      On Automatic creation
        Uses
            Creative techniques
            Strategic planning
            Argument mapping
    Tools
      Pen and paper
      Mermaid
```

mindmap
  root((mindmap))
    Origins
      Long history
      ::icon(fa fa-book)
      Popularisation
        British popular psychology author Tony Buzan
    Research
      On effectiveness<br/>and features
      On Automatic creation
        Uses
            Creative techniques
            Strategic planning
            Argument mapping
    Tools
      Pen and paper
      Mermaid

Timeline

```mermaid
timeline
  title History of Social Media Platform
  2002 : LinkedIn
  2004 : Facebook
       : Google
  2005 : Youtube
  2006 : Twitter
```

timeline
  title History of Social Media Platform
  2002 : LinkedIn
  2004 : Facebook
       : Google
  2005 : Youtube
  2006 : Twitter

Sankey

```mermaid
sankey-beta
  %% source,target,value
  Electricity grid,Over generation / exports,104.453
  Electricity grid,Heating and cooling - homes,113.726
  Electricity grid,H2 conversion,27.14
```

sankey-beta
  %% source,target,value
  Electricity grid,Over generation / exports,104.453
  Electricity grid,Heating and cooling - homes,113.726
  Electricity grid,H2 conversion,27.14

XYChart

```mermaid
xychart-beta
  title "Sales Revenue"
  x-axis [jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec]
  y-axis "Revenue (in $)" 4000 --> 11000
  bar [5000, 6000, 7500, 8200, 9500, 10500, 11000, 10200, 9200, 8500, 7000, 6000]
  line [5000, 6000, 7500, 8200, 9500, 10500, 11000, 10200, 9200, 8500, 7000, 6000]
```

xychart-beta
  title "Sales Revenue"
  x-axis [jan, feb, mar, apr, may, jun, jul, aug, sep, oct, nov, dec]
  y-axis "Revenue (in $)" 4000 --> 11000
  bar [5000, 6000, 7500, 8200, 9500, 10500, 11000, 10200, 9200, 8500, 7000, 6000]
  line [5000, 6000, 7500, 8200, 9500, 10500, 11000, 10200, 9200, 8500, 7000, 6000]

Block Diagram

```mermaid
block-beta
  columns 1
    db(("DB"))
    blockArrowId6<["&nbsp;&nbsp;&nbsp;"]>(down)
    block:ID
      A
      B["A wide one in the middle"]
      C
    end
    space
    D
    ID --> D
    C --> D
    style B fill:#969,stroke:#333,stroke-width:4px
```

block-beta
  columns 1
    db(("DB"))
    blockArrowId6<["&nbsp;&nbsp;&nbsp;"]>(down)
    block:ID
      A
      B["A wide one in the middle"]
      C
    end
    space
    D
    ID --> D
    C --> D
    style B fill:#969,stroke:#333,stroke-width:4px

Packet

```mermaid
---
title: "TCP Packet"
---
packet-beta
  0-15: "Source Port"
  16-31: "Destination Port"
  32-63: "Sequence Number"
  64-95: "Acknowledgment Number"
  96-99: "Data Offset"
  100-105: "Reserved"
  106: "URG"
  107: "ACK"
  108: "PSH"
  109: "RST"
  110: "SYN"
  111: "FIN"
  112-127: "Window"
  128-143: "Checksum"
  144-159: "Urgent Pointer"
  160-191: "(Options and Padding)"
  192-255: "Data (variable length)"
```

---
title: "TCP Packet"
---
packet-beta
  0-15: "Source Port"
  16-31: "Destination Port"
  32-63: "Sequence Number"
  64-95: "Acknowledgment Number"
  96-99: "Data Offset"
  100-105: "Reserved"
  106: "URG"
  107: "ACK"
  108: "PSH"
  109: "RST"
  110: "SYN"
  111: "FIN"
  112-127: "Window"
  128-143: "Checksum"
  144-159: "Urgent Pointer"
  160-191: "(Options and Padding)"
  192-255: "Data (variable length)"

Architecture

```mermaid
architecture-beta
  group api(cloud)[API]

  service db(database)[Database] in api
  service disk1(disk)[Storage] in api
  service disk2(disk)[Storage] in api
  service server(server)[Server] in api

  db:L -- R:server
  disk1:T -- B:server
  disk2:T -- B:db
```

architecture-beta
  group api(cloud)[API]

  service db(database)[Database] in api
  service disk1(disk)[Storage] in api
  service disk2(disk)[Storage] in api
  service server(server)[Server] in api

  db:L -- R:server
  disk1:T -- B:server
  disk2:T -- B:db