setInterval() still triggering after clearInterval() in NodeJS

I have the following code setting and clearing an interval inside a NodeJS script.

Starting interval works fine, but when trying to clear it, the stopping interval console will trigger, but the interval will continue firing every minute.

app.get("/api", async (req, res) => {

    active = req.query.active;
    
    let interval = null;

    if (active == "true") {

        console.log("starting interval");

        interval = setInterval(async function() {
            try {
                const Posts = await getPosts();
                const Comments = await getComments();
                sendPosts().then(() => sendComments());

            } catch (e) {
                throw e;
            };
        }, 60000);

        res.json({ reddit: subreddit, discordChannel: discordChannel, activated: true});

    } else {

        console.log("stopping interval");

        clearInterval(interval);
        interval = null;

        res.json({ reddit: subreddit, discordChannel: discordChannel, activated: false});
    }
    
});

What am I missing?