Where to view console.log output using nodejs/npm start?

very new to react/node/using npm start to start a server. Using npm start to start the server works and displays my react code, but I need to do some debugging. However, my console.logs aren't outputting to the browser console. After that, I thought to check my terminal (which i think is where node console.log outputs to), but since I used npm start, the terminal that I launched the application from is stuck on this screen:

Compiled successfully!

You can now view my-app in the browser.

  Local:            http://localhost:3000/
  On Your Network:  http://[ip_address_here]:3000/

Note that the development build is not optimized.
To create a production build, use npm run build.

And therefore, I cannot read any console output on this screen. I feel like this should be a super basic fix and I'm probably just overlooking something extremely obvious, but could somebody help me out here? Thanks.

EDIT: I was asked to share some code, here it is:

Here is a snippet of my App.js file:

import React from 'react';

//quick class
class App extends React.Component {
    constructor(props){
        super(props);

        this.state = {
            testRows : null
        }

        this.getTest = this.getTest.bind(this);
    }

    //get some rows from my api using a local database with sqlite3
    async getTest(){
        try{
            console.log("hello?");
            const response = await fetch('http://localhost:3000/api/test');
            if(response.ok){
                const JSONresponse = response.json();
                console.log(JSOnresponse);
                this.setState({testRows : JSONresponse});
            }
            else{
                this.setState({testRows: "test error"});
                console.log('There was an error with the fetch');
            }
        }
        catch(error){
            console.log(error);
        }
    }

    //render some text, a button, and the result
    render(){
        let testResults;
        if(this.state.testRows){
            testResults = Object.keys(this.state.testRows).map((data) => {
                    return <h1>{data.name}</h1>
                }
            )
        }
        else{
            testResults = "null";
        }


        return(
            <div>
                <h2>Some testing going on here</h2>
                <button onClick={this.getTest}>
                    Press me for test!
                </button>
                <h3>{testResults}</h3>
            </div>
        );
    }
}

export default App;

Here is a snippet of my api.js file:

apiRouter.get('/test', (req, res, next) => {
    db.get('SELECT * FROM Test', (error, rows) => {
        if(error){
            console.log(error);
        }
        else{
            console.log("got the test");
            console.log(rows);
            res.send(rows);
        }
    })
})

The router is mounted and everything else in other parts of the code, but the console.logs there don't show up anywhere (dev tools console or terminal) either.