Exercise Workflow
STEP 1 / 5
1
1 · Configure
Inspect files & settings
2
2 · Arrange
Drag, reorder or remove
3
3 · Validate Order & Build
Generate server code
4
4 · Happy Path Verify
Prove HTTP 201 first
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5 · Failure Debug
Unlock & test scenarios 2–5
Step 1 — Configure: Click each middleware file to inspect its responsibility. Adjust the demo token or minimum amount if desired, then start arranging the pipeline.
2. Server Pipeline
Order executes top-to-bottom
→
DROP MIDDLEWARE ABOVE ROUTE
POST /api/transactions — Route Handler
!
Error Handler
Final error middleware — fixed after routes
3. Project Architecture
Live reflection of Express registration
server.js · listen
→
app.js · pipeline order
→
routes/
→
controllers/
app.js — Live Generated Code
✓ app.js is generated from the current Visual Middleware Pipeline.
4. Five Banking Test Scenarios
[BOOT] Express middleware server ready.
HTTP Response Payload
No request yet.
Generated Server Code (server.js runtime)
Scenario Mastery Tracker
Execute all 5 scenarios to understand error triggers.
Completed scenarios: 0 / 5