TypeScript Lab: Route Parts Visualizer

LAB / EXPLORATION

TypeScript Lab: Route Parts Visualizer

Planned

LAB 083 — Node HTTP & APIs
Split an API path into meaningful route segments.

LAB TypeScript Lab: Route Parts Visualizer Preview coming soon

LAB 083

TypeScript Lab: Route Parts Visualizer

Concept

URL parsing turns request paths into pieces that routing logic can inspect.

Concept

URL parsing turns request paths into pieces that routing logic can inspect.

Objective & Explanation

What the project should make visible and why the concept matters.

Learning Target

Objective

Split an API path into meaningful route segments.

Explanation

URL parsing turns request paths into pieces that routing logic can inspect.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── tsconfig.json
├── public/
│   ├── index.html
│   └── styles.css
└── src/
    └── server.ts

Technologies

TypeScript
Node.js
HTTP
HTML
CSS

Data Layer

No persistent data layer. Keep all demonstration values inside the standalone project.

Sandbox Source

src/local-editor/server.ts → pathParts()

Build Instructions

Build only the focused behavior, then use the visual layer to inspect it.

Setup

Create the standalone project folder and listed files.

Implement

Implement the smallest version that demonstrates the concept.

Run & Inspect

Use the interface to trigger and inspect the request/response behavior.

Code & Configuration

Starter configuration plus the focused implementation example.

Focused TypeScript

Implement this behavior first, then alter the input.

function pathParts(url = "/"): string[] {
  return new URL(url, "http://localhost:4173")
    .pathname
    .split("/")
    .filter(Boolean);
}

pathParts("/api/records/123");

Starter Configuration

Keep the project independently buildable.

package.json

{
  "type": "module",
  "scripts": {
    "build": "tsc",
    "start": "npm run build && node --enable-source-maps dist/server.js"
  },
  "devDependencies": {
    "@types/node": "^26.4.0",
    "typescript": "^7.0.2"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["ES2022", "DOM"],
    "types": ["node"],
    "strict": true,
    "sourceMap": true
  },
  "include": ["src/**/*.ts"]
}

Expected Visual Result

The output is the proof that the concept is working.

Visible Proof

The browser should visibly demonstrate: split an API path into meaningful route segments.

Data: None