how to connect react with mongodb code example

Example 1: how to sent react from data in mongodb

handleSubmit(){
    let databody = {
        "name": this.state.nameIn,
        "quote": this.state.quoteIn
    }

    return fetch('http://localhost:5002/stored', {
        method: 'POST',
        body: JSON.stringify(databody),
        headers: {
            'Content-Type': 'application/json'
        },
    })
    .then(res => res.json())
    .then(data => console.log(data)); 
}


render(){
    return (
        <div>
            <form onSubmit={this.handleSubmit}>
                <label>
                    Name
                    <input type="text" name="name" value={this.nameIn} onChange={this.handleNameChange}/>
                </label>
                <label>
                    quote
                    <input type="text" name="quote" value={this.quoteIn} onChange={this.handleQuoteChange}/>
                </label>
                <input type="submit" value="Add to DB" />
            </form> 
        </div>
    );
}

Example 2: how to sent react from data in mongodb

app.post('/stored', (req, res) => {
    console.log(req.body);
    db.collection('quotes').insertOne(req.body, (err, data) => {
        if(err) return console.log(err);
        res.send(('saved to db: ' + data));
    })
});