[sanjeetkumaritoutlook-user]

A Mermaid diagram is a text-based way to create diagrams and visualizations. Instead of dragging boxes and arrows in a tool, you write simple plain text code, and Mermaid renders it into a nice diagram.

It’s especially popular in GitHub READMEs and documentation because you can keep the diagram version-controlled as text.
🔹 Types of Diagrams Mermaid Supports

Flowcharts (flowchart TD)

Sequence diagrams (showing interactions over time)

Class diagrams (UML-like)

State diagrams

Gantt charts (timelines)

Pie charts

ER diagrams (Entity–Relationship)

User journey diagrams

🔹 Why it’s Useful

Text-based → easy to store in Git repos, review in PRs.

No external design tool needed.

Auto-updates with changes (no need to redraw).

Works in GitHub, GitLab, VS Code, Notion, Obsidian, etc.
mermaid-examples.pdf

[Copilot]

Pull Request Overview

Adds Mermaid diagram examples and a cheat sheet to the repository to document common diagram types and provide ready-to-use snippets.

• Introduces individual markdown files for flowchart, sequence, state, Gantt, pie chart, ER, and user journey diagrams.
• Adds a consolidated "Mermaid Diagrams Cheat Sheet" with correct, ready-to-render examples.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
diagrams/userjourney.md	Adds a user journey mermaid diagram example.
diagrams/state.md	Adds a state diagram example.
diagrams/sequence.md	Adds a sequence diagram example.
diagrams/piechart.md	Adds a pie chart example.
diagrams/mermaid-examples.md	Adds a consolidated cheat sheet of mermaid examples (correctly formatted).
diagrams/gantt.md	Adds a Gantt chart example.
diagrams/flowchart.md	Adds a flowchart example.
diagrams/erdiagram.md	Adds an ER diagram example.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

The HTML entity   and the escaped square brackets (\[ \]) will render literally inside the mermaid code block and break diagram parsing. Use normal spaces for indentation and unescaped brackets: e.g., replace '  A\[Start]' with ' A[Start]'. Apply the same change to lines 7, 9, and 11.

Suggested change

	  A\[Start] --> B{Is it working?}
	  B -- Yes --> C\[Keep using it]
	  B -- No --> D\[Fix it]
	  D --> B
	A[Start] --> B{Is it working?}
	B -- Yes --> C[Keep using it]
	B -- No --> D[Fix it]
	D --> B

[Copilot]

Using   and escaping the initial state token '\[\]' will cause mermaid parsing errors. Replace ' ' with normal spaces and use the proper mermaid syntax '[]': e.g., '[*] --> Idle', and similarly unescape the rest.

Suggested change

	  \[\*] --> Idle
	  Idle --> Running : Start
	  Running --> Idle : Stop
	  Running --> Error : Crash
	  Error --> Idle : Reset
	[*] --> Idle
	Idle --> Running : Start
	Running --> Idle : Stop
	Running --> Error : Crash
	Error --> Idle : Reset

[Copilot]

The   entity and escaped underscores (LINE\_ITEM) will break mermaid ER parsing. Use normal spaces and unescaped identifiers: 'LINE_ITEM'. Apply this to the relationship line (7) and the entity declaration (27), and remove ' ' across the file.

Suggested change

	  USER ||--o{ ORDER : places
	  ORDER ||--|{ LINE\_ITEM : contains
	  USER {
	  int id
	  string name
	  string email
	  }
	  ORDER {
	  int id
	  date orderDate
	  }
	  LINE\_ITEM {
	  int id
	  int quantity
	  }
	USER ||--o{ ORDER : places
	ORDER ||--|{ LINE_ITEM : contains
	USER {
	int id
	string name
	string email
	}
	ORDER {
	int id
	date orderDate
	}
	LINE_ITEM {
	int id
	int quantity
	}

[Copilot]

The literal ' ' entities inside the mermaid code block will prevent the Gantt chart from rendering. Replace them with normal spaces so mermaid sees valid syntax.

Suggested change

	  title Project Timeline
	  dateFormat YYYY-MM-DD
	  section Planning
	  Research :a1, 2025-09-22, 5d
	  Design :after a1, 3d
	  section Development
	  Implementation :2025-09-30, 10d
	  Testing :2025-10-10, 5d
	title Project Timeline
	dateFormat YYYY-MM-DD
	section Planning
	Research :a1, 2025-09-22, 5d
	Design :after a1, 3d
	section Development
	Implementation :2025-09-30, 10d
	Testing :2025-10-10, 5d

[Copilot]

The ' ' HTML entities will render as text and break the pie chart. Replace with normal spaces so the values parse correctly.

Suggested change

	  "JavaScript" : 40
	  "Python" : 30
	  "Java" : 20
	  "C++" : 10
	"JavaScript" : 40
	"Python" : 30
	"Java" : 20
	"C++" : 10

[Copilot]

The ' ' entities will appear as literal text and cause the sequence diagram to fail. Replace with regular spaces; indentation is optional in mermaid but must be plain spaces if used.

Suggested change

	  participant User
	  participant Server
	  User->>Server: Login Request
	  Server-->>User: Authentication Token
	  User->>Server: Get Data
	  Server-->>User: Response Data
	participant User
	participant Server
	User->>Server: Login Request
	Server-->>User: Authentication Token
	User->>Server: Get Data
	Server-->>User: Response Data

[Copilot]

The use of ' ' inside the mermaid code fence will break the journey diagram. Replace with standard spaces so mermaid recognizes 'title', 'section', and the rating lines correctly; apply throughout the file.

Suggested change

	  title Shopping Experience
	  section Browse
	  User: Happy : 5
	  Website: Confused : 2
	  section Checkout
	  User: Frustrated : 3
	  Website: Neutral : 3
	  section Payment
	  User: Satisfied : 4
	  Website: Happy : 5
	title Shopping Experience
	section Browse
	User: Happy : 5
	Website: Confused : 2
	section Checkout
	User: Frustrated : 3
	Website: Neutral : 3
	section Payment
	User: Satisfied : 4
	Website: Happy : 5

[Copilot]

Same issue as above: ' ' must be removed so the transition 'Error --> Idle : Reset' is valid mermaid syntax.