FAQ: Learn Express Routes - Setting Status Codes


This community-built FAQ covers the “Setting Status Codes” exercise from the lesson “Learn Express Routes”.

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This exercise can be found in the following Codecademy content:

Web Development

Learn Express

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Hi, I tried to use this code in my Atom text editor:

var express = require(‘express’);
var app = express();

const monsterStoreInventory = { fenrirs: 4, banshees: 1, jerseyDevils: 4, krakens: 3 };

app.get(’/monsters-inventory/:name’, (req, res, next) => {
const monsterInventory = monsterStoreInventory[req.params.name];
if (monsterInventory) {
} else {
res.status(404).send(‘Monster not found’);


However, when I try to access the following path in my browser http://localhost:3000/monsters-inventory/jerseyDevils, I receive the following error:

RangeError [ERR_HTTP_INVALID_STATUS_CODE]: Invalid status code: 4
at ServerResponse.writeHead (_http_server.js:208:11)
at ServerResponse._implicitHeader (_http_server.js:199:8)
at ServerResponse.end (_http_outgoing.js:712:10)
at ServerResponse.send (/Users/viktorkarpanasiuk/Programming/ninjaProject/node_modules/express/lib/response.js:221:10)
at app.get (/Users/viktorkarpanasiuk/Programming/ninjaProject/app.js:9:9)
at Layer.handle [as handle_request] (/Users/viktorkarpanasiuk/Programming/ninjaProject/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/viktorkarpanasiuk/Programming/ninjaProject/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/viktorkarpanasiuk/Programming/ninjaProject/node_modules/express/lib/router/route.js:112:3)
at Layer.handle [as handle_request] (/Users/viktorkarpanasiuk/Programming/ninjaProject/node_modules/express/lib/router/layer.js:95:5)
at /Users/viktorkarpanasiuk/Programming/ninjaProject/node_modules/express/lib/router/index.js:281:22

When I try to access the monster, the is not defined, I receive ‘Monster not found’. This shows that the code works, however, I still have the problem with accessing the monsters