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Traced in storefront-app

How the product page gets its data, across 6 files.

[id]/page.tsx→api/products.ts→api/client.ts→[id]/route.ts→server/products.ts→db/schema.ts

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01 / 06
A repository arrives as files.
Fifteen source files in this sample. Thousands in a real project. On their own, file names say little about how anything works.
02 / 06
Files become a system.
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03 / 06
One feature, traced.
Ask how the product page gets its data and the path lights up: route, API client, handler, query, schema, component.
04 / 06
An answer you can check.
The explanation cites the files and lines it relies on, so you can open the code and confirm it yourself.
Explanation
The page reads the id from the route, calls getProduct, which requests /api/products/:id. The handler queries the products table and the page renders ProductDetails.
05 / 06
Something worth a second look.
Connections also surface risk. Here, checkout passes a discounted total that may not be whole cents. A lead to verify, not a verdict.
Potential issue
Checkout forwards a discounted total that may not be whole cents. server/cart.ts:36
06 / 06
A map you can navigate.
The repository resolves into layers you can move through: pages, client code, handlers, server logic, data and tests.

storefront-app

A repository arrives as files.

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storefront-app / main

Sample repository with predefined answers

Files

app/products/[id]/page.tsx

L7–16

1import { notFound } from "next/navigation";
2import { getProduct } from "@/lib/api/products";
3import { ProductDetails } from "@/components/ProductDetails";
4 
5type Props = { params: Promise<{ id: string }> };
6 
7export default async function ProductPage({ params }: Props) {
8  const { id } = await params;
9  const product = await getProduct(id);
10 
11  if (!product) {
12    notFound();
13  }
14 
15  return <ProductDetails product={product} />;
16}

Explanation

How does the product page retrieve and display product information?

The product page loads the product identifier from the route, requests the matching product through the API utility, and passes the returned data to the ProductDetails component for rendering.

Awaits the route params and reads id.
getProduct(id) calls apiFetch with a 60s revalidate window.
apiFetch requests /api/products/:id and throws ApiError on non-2xx.
The GET handler looks the product up and returns 404 when missing.
findProductById selects one row from the products table.
The page renders ProductDetails with the returned product.

Direct evidence

Inference

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Related files

Product route. Reads the id, loads the product, renders details.

Depends on

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Trace: product page data flow

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storefront-app

Pages & UI

What users see

page.tsx
ProductDetails.tsx

Client lib

fetch + session

client.ts
session.ts

API handlers

Thin, authenticated

cart/route.ts
checkout/route.ts

Server logic

Cart and checkout rules

cart.ts
checkout.ts

Data

Drizzle schema

schema.ts

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Symptom

POST /api/checkout → 500

app/api/checkout/route.tsPOST()
No error handling: throws become a 500
server/checkout.tscreateCheckout()
Forwards totals.subtotalCents as amount
server/cart.tscalculateTotals()
Discount applied without rounding

server/cart.ts

35 return {
36   subtotalCents: subtotalCents * (1 - discountRate),
37   itemCount: items.length,

Hypothesis. Fractional cents may be rejected by the payment provider. Confirm with logs or a failing test before changing code.

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Your entire codebase. Finally, understood.

Code is connected. Understanding should be too.

A repository arrives as files.

Files become a system.

One feature, traced.

An answer you can check.

Something worth a second look.

A map you can navigate.

Try it on a sample repository.

How does the product page retrieve and display product information?

Core capabilities