#231 · Backend Framework Tools Developer Tool

Express Viewer

Visualize Express routes, middleware order, router mounts, static paths, and endpoint structure from one or more source files.

Developer Input

Express project source

Paste Express app, router, middleware, or multi-file source

// FILE: app.js
const express = require("express");
const app = express();
const usersRouter = require("./routes/users");
app.use(express.json());
app.use("/api/users", usersRouter);
app.get("/health", healthCheck);
app.use(express.static("public"));
app.use(notFoundHandler);
app.use(errorHandler);

// FILE: routes/users.js
const router = express.Router();
router.get("/", listUsers);
router.post("/", createUser);
router.get("/:id", getUser);
module.exports = router;

View Mode

Base Path

path

Include middleware Include handler names Show source lines Auto-run while typing

Your code is processed locally in your browser and is not uploaded by this tool.

How to use this developer tool

Paste a single Express file or separate multiple files with // FILE: markers.
Select a route, middleware, endpoint, or project summary view.
Set an optional base path and run the viewer.
Review confirmed and unresolved static connections before copying the report.

What this developer tool does

The viewer extracts direct route declarations, middleware registrations, router mount paths, static directories, and environment variable references without executing the application.

Static source → virtual files → route and middleware extraction → mount-path merge → selected structure view

Dynamic paths, computed method names, runtime imports, and dependency injection cannot always be resolved and are marked as unresolved.

Example

An app mounting usersRouter at /api/users and a router declaring GET /:id is displayed as GET /api/users/:id when the mount can be inferred.

Tips for better output

Include both the app entry file and router files.
Keep import variable names aligned with router mount names.
Use literal route strings for the clearest output.
Include package.json when version context matters.

FAQ

Does this tool execute Express code?

No. It performs static browser-based analysis and does not start a server or load dependencies.

Can it detect nested routers?

It can merge common literal mount paths and router paths when variable names and files are recognizable.

Does it support multiple files?

Yes. Separate files with // FILE: filename markers.

Can it resolve dynamic route expressions?

Not reliably. Dynamic paths are listed as unresolved rather than guessed.

Is my source uploaded?

No. The source is processed locally in the browser.

Related developer tools

Node Checker Node Generator Node Formatter Node Converter

Express elements detected

Routes	HTTP method, path, handler, source line
Middleware	Registration order and optional mount path
Static files	express.static directory references
Environment	process.env variable names

Browse more developer tools

Calldeveloper category hub

Browse Backend Framework Tools