Skip to content
On this page

Examples

This page contains a collection of examples of diagrams and charts that can be created through mermaid and its myriad applications.

If you wish to learn how to support mermaid on your webpage, read the Beginner's Guide.

If you wish to learn about mermaid's syntax, Read the Diagram Syntax section.

Basic Pie Chart

Code:
mermaid
pie title NETFLIX
         "Time spent looking for movie" : 90
         "Time spent watching it" : 10
null
Code:
mermaid
pie title What Voldemort doesn't have?
         "FRIENDS" : 2
         "FAMILY" : 3
         "NOSE" : 45
null

Basic sequence diagram

Code:
mermaid
sequenceDiagram
    Alice ->> Bob: Hello Bob, how are you?
    Bob-->>John: How about you John?
    Bob--x Alice: I am good thanks!
    Bob-x John: I am good thanks!
    Note right of John: Bob thinks a long<br/>long time, so long<br/>that the text does<br/>not fit on a row.

    Bob-->Alice: Checking with John...
    Alice->John: Yes... John, how are you?
null

Basic flowchart

Code:
mermaid
graph LR
    A[Square Rect] -- Link text --> B((Circle))
    A --> C(Round Rect)
    B --> D{Rhombus}
    C --> D
null

Larger flowchart with some styling

Code:
mermaid
graph TB
    sq[Square shape] --> ci((Circle shape))

    subgraph A
        od>Odd shape]-- Two line<br/>edge comment --> ro
        di{Diamond with <br/> line break} -.-> ro(Rounded<br>square<br>shape)
        di==>ro2(Rounded square shape)
    end

    %% Notice that no text in shape are added here instead that is appended further down
    e --> od3>Really long text with linebreak<br>in an Odd shape]

    %% Comments after double percent signs
    e((Inner / circle<br>and some odd <br>special characters)) --> f(,.?!+-*ุฒ)

    cyr[Cyrillic]-->cyr2((Circle shape ะะฐั‡ะฐะปะพ));

     classDef green fill:#9f6,stroke:#333,stroke-width:2px;
     classDef orange fill:#f96,stroke:#333,stroke-width:4px;
     class sq,e green
     class di orange
null

SequenceDiagram: Loops, alt and opt

Code:
mermaid
sequenceDiagram
    loop Daily query
        Alice->>Bob: Hello Bob, how are you?
        alt is sick
            Bob->>Alice: Not so good :(
        else is well
            Bob->>Alice: Feeling fresh like a daisy
        end

        opt Extra response
            Bob->>Alice: Thanks for asking
        end
    end
null

SequenceDiagram: Message to self in loop

Code:
mermaid
sequenceDiagram
    participant Alice
    participant Bob
    Alice->>John: Hello John, how are you?
    loop Healthcheck
        John->>John: Fight against hypochondria
    end
    Note right of John: Rational thoughts<br/>prevail...
    John-->>Alice: Great!
    John->>Bob: How about you?
    Bob-->>John: Jolly good!
null

Sequence Diagram: Blogging app service communication

Code:
mermaid
sequenceDiagram
    participant web as Web Browser
    participant blog as Blog Service
    participant account as Account Service
    participant mail as Mail Service
    participant db as Storage

    Note over web,db: The user must be logged in to submit blog posts
    web->>+account: Logs in using credentials
    account->>db: Query stored accounts
    db->>account: Respond with query result

    alt Credentials not found
        account->>web: Invalid credentials
    else Credentials found
        account->>-web: Successfully logged in

        Note over web,db: When the user is authenticated, they can now submit new posts
        web->>+blog: Submit new post
        blog->>db: Store post data

        par Notifications
            blog--)mail: Send mail to blog subscribers
            blog--)db: Store in-site notifications
        and Response
            blog-->>-web: Successfully posted
        end
    end

null

A commit flow diagram.

Code:
mermaid
gitGraph:
    commit "Ashish"
    branch newbranch
    checkout newbranch
    commit id:"1111"
    commit tag:"test"
    checkout main
    commit type: HIGHLIGHT
    commit
    merge newbranch
    commit
    branch b2
    commit
null