Creating Sequence Diagram using PlantUML

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PlantUML is an open-source implement and syntax for engendering diagrams from plain-text definitions. We utilize simple text syntax to describe a type of diagram, as well as the elements which make up the diagram, and our away.

Utilizing this plain text syntax and a rendering server/plugin to convert our text into diagrams, we can draw near on any architectural diagram that we require when designing a system.

Here are just a few of the types of diagrams we can engender:

Sequence diagram
Usecase diagram
Class diagram
Object diagram
Activity diagram
Component diagram
Deployment diagram
State diagram
Timing diagram

Steps to create sequence diagrams

Step 1: Download and Install Visual Studio Code: https://code.visualstudio.com/download

Step 2: Add PlantUML extension for Visual Studio Code

Install the extension

Step 3: Create a text file with PlantUML commands, like this example called sequenceDiagram.txt:

@startuml
skinparam SequenceMessageAlignment center
actor User
User -> WebPortal: login 
WebPortal -> Backend:POST request with username and password
Backend ->Backend:Validation.Generate JWT token.
Backend -->WebPortal:Return JWT token
WebPortal ->WebPortal:Store JWT token
User -> WebPortal:Get list of articles
WebPortal ->Backend:GET /article(send JWT token at header)
Backend ->Backend:Validate JWT token
Backend-->WebPortal:Return the Response
@enduml

Run

Open a PlantUML file in Visual Studio Code editor
Right-click on the PlantUML file and select "Preview current PlantUML code". The diagram will open in a new tab.
Shortcut keys: Click anywhere on the PlantUML file and use the following shortcut keys to view the PlantUML code:

CTRL + P (Windows/Linux)

CMD + P (Mac)

or We can export the diagram

Right-click on the PlantUML file and select "Export Current Diagram".

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