Fix

src/express/listEndpoints.js

@@ -216,14 +216,14 @@ const parseStack = function (stack, basePath, endpoints) {
   return endpoints;
 };
 
-const getEndpoints = function (app) {
+const getEndpoints = function (app, basePath) {
   const endpoints = parseEndpoints(app);
   return endpoints.flatMap((route) =>
     route.methods
       .filter((method) => !["HEAD", "OPTIONS"].includes(method.toUpperCase()))
       .map((method) => ({
         method,
-        path: route.path,
+        path: basePath + route.path,
       })),
   );
 };

src/express/middleware.ts

@@ -1,4 +1,5 @@
-import type { Express, NextFunction, Request, Response, Router } from "express";
+import type { Express, NextFunction, Request, Response } from "express";
+import { Router } from "express";
 import type { ILayer } from "express-serve-static-core";
 import { performance } from "perf_hooks";
 
@@ -20,12 +21,15 @@ declare module "express" {
   }
 }
 
-export const useApitally = (app: Express | Router, config: ApitallyConfig) => {
+export const useApitally = (
+  app: Express | Router,
+  config: ApitallyConfig & { basePath?: string },
+) => {
   const client = new ApitallyClient(config);
   const middleware = getMiddleware(app, client);
   app.use(middleware);
   setTimeout(() => {
-    client.setStartupData(getAppInfo(app, config.appVersion));
+    client.setStartupData(getAppInfo(app, config.basePath, config.appVersion));
   }, 1000);
 };
 
@@ -229,6 +233,7 @@ const subsetJoiMessage = (message: string, key: string) => {
 
 const getAppInfo = (
   app: Express | Router,
+  basePath?: string,
   appVersion?: string,
 ): StartupData => {
   const versions: Array<[string, string]> = [
@@ -246,7 +251,7 @@ const getAppInfo = (
     versions.push(["app", appVersion]);
   }
   return {
-    paths: listEndpoints(app),
+    paths: listEndpoints(app, basePath || ""),
     versions: Object.fromEntries(versions),
     client: "js:express",
   };

tests/express/app.test.ts

@@ -154,7 +154,9 @@ describe("Middleware for Express router", () => {
     expect(
       requests.some(
         (r) =>
-          r.method === "GET" && r.path === "/hello" && r.status_code === 200,
+          r.method === "GET" &&
+          r.path === "/api/hello" &&
+          r.status_code === 200,
       ),
     ).toBe(true);
   });
@@ -163,7 +165,7 @@ describe("Middleware for Express router", () => {
     expect(client.startupData?.paths).toEqual([
       {
         method: "GET",
-        path: "/hello",
+        path: "/api/hello",
       },
     ]);
   });

tests/express/app.ts

@@ -116,6 +116,7 @@ export const getAppWithMiddlewareOnRouter = () => {
     clientId: CLIENT_ID,
     env: ENV,
     appVersion: "1.2.3",
+    basePath: "/api",
   });
 
   router.get("/hello", (req, res) => {