The problem with nodejs and undefined variable

[izadmehr.mehrdad]

-i am new in java script and i have a problem using node js

here is my code

i am using this part to show an input box ,SkyColor

let ourApp = express()       
 
ourApp.use(express.json()) 
ourApp.get("/", function(req, res) {
    res.send(`
    <form action='/answer' method='POST'>
    <p>What color is the sky on a clear and sunny day?</p>
    <input name= "skyColor" autocomplete="off">
    <button>Submit Answer</button>
    </form>
    `)
})

then if i type blue and hit the button to that input box the if statement must chose to show “Congrats! You got the right answer.”

ourApp.post('/answer', function(req, res) {
    if(req.body.skyColor == "blue") {
        res.send(`
        <p>Congrats! You got the right answer.</p>
        <a href="/">Back to homepage</a>
        `)
        console.log(req.body.skyColor)
        } else  {
            res.send(`
            <p>Sorry, you got the wrong answer. Please try again</p>
            <a href="/">Back to homepage</a>
            `)
        }
  
})

ourApp.get('/answer', function(req, res) {
    res.send("Are you lost? There is nothing to see here.")
})
ourApp.listen(3000)

but unfortunately every time i enter “blue” the if dont work correctly and show the else part “Sorry, you got the wrong answer. Please try again”

[kevinSmith]

Can you put console.log(req.body) at the top of you ourApp.post('/answer' callback? Are you using a bodyParser?