Workflow guide

API debugging to sequence diagram

Turn OpenAPI paths, Postman collections, HAR traffic, and error notes into sequence diagrams for backend review.

Open example OpenAPI zu Sequenzdiagramm

Start from the contract

Use a focused OpenAPI path group so the diagram explains one workflow instead of the entire API.

Compare request order

Preview Postman or HAR traffic to see whether runtime calls match the documented sequence.

Document the failure path

Add error responses, retries, and timeout behavior so incident notes explain what actually happened.

Paste-ready example

Checkout OpenAPI path

Start from a narrow OpenAPI path group so the sequence diagram explains one request path and its failure response.

Open this example

openapi: 3.0.0
paths:
  /checkout:
    post:
      summary: Create checkout session
      responses:
        "201":
          description: Checkout created
        "402":
          description: Payment required
  /checkout/{id}:
    get:
      summary: Read checkout status
      responses:
        "200":
          description: Checkout status

Workflow FAQ

Why use a sequence diagram for API debugging?

A sequence diagram makes request order, actors, retries, and failure responses visible, which is often faster than reading logs line by line.

Should the diagram include every endpoint?

No. Use one user journey, incident, or API path group per diagram so reviewers can see cause and effect clearly.

API debugging to sequence diagram

Start from the contract

Compare request order

Document the failure path

Checkout OpenAPI path

Workflow FAQ

Why use a sequence diagram for API debugging?

Should the diagram include every endpoint?

Related tools

OpenAPI zu Sequenzdiagramm

Postman Collection zu Sequenzdiagramm

HAR zu Sequenzdiagramm

API-Fehlerfluss Diagramm