Trace the request entrypoint

alt_routeEntrypoint traceeasyfolder_openorders-service · HTTP APIpsychologyrequest-flow navigationschedule~6m

SituationYou just cloned orders-service and need to debug a slow GET /orders/:id endpoint. Before changing anything, map where the request enters the app and how it flows to the data layer.

alt_routeTrace maptap a node to open the file

folder_opensrc/server.tsts

Boots the process and wires routes — but does not handle any single request.

1import express from "express";

2import { registerRoutes } from "./routes";

4const app = express();

5registerRoutes(app);

7app.listen(process.env.PORT ?? 3000);

map

Map builder

in progress

1Target

Which file is the request entrypoint for GET /orders/:id — the first place that endpoint is bound?

2Path

Order the request flow from entrypoint to the database.

DBarrow_forwardRepoarrow_forwardServicearrow_forwardHandlerarrow_forwardRoute

1db client executes against Postgres
2ordersRepo.findById builds and runs the query
3ordersService.getOrder applies rules, calls the repo
4getOrderHandler reads req.params, calls the service
5Route binds GET /orders/:id → getOrderHandler

3What you noticed

Select every observation that is true of this flow.

Still need to: pick a target, add an observation.