Understanding a Terraform project is far easier with a picture, but drawing architecture diagrams by hand is slow and goes stale the moment the code changes. A diagram generated from the configuration itself always reflects what is actually defined, showing resources, their types and the relationships between them. Teams use these diagrams for design reviews, handovers, audits and onboarding new engineers who need to see topology quickly without reading every single file in the repository by hand.
The Terraform Architecture Diagram Generator parses your .tf files and produces a diagram description you can render with a standard tool such as Mermaid or PlantUML. It extracts resource blocks, groups them by type, and draws edges for the references it can detect, such as a subnet attached to a VPC or an instance using a security group. The layout is text based, so it lives in version control next to the code and can be regenerated after every change. Parsing happens entirely in your browser, so your configuration is never uploaded and stays private on your machine at all times while you work.
Use it to visualise a module before a review, to document an existing estate, or to catch missing connections that a flat file list hides from reviewers and operators who must reason carefully about blast radius and failure modes.
Because the output is plain text, you can diff two versions of a diagram in code review and see exactly how the topology changed between pull requests. That makes architecture review a first-class, reviewable artefact instead of a separate document that drifts from the code it describes and is forgotten after the meeting ends.