Just a demo of the oddity with LevelUP's createValueStream() method

levelup-value-stream.js

const level = require('level');
const db = level('./testDB', { valueEncoding: 'json' });

async function main() {

    await db.put('key-1', 'some value');
    await db.put('key-2', '');
    await db.put('key-3', -1);
    await db.put('key-4', 0);
    await db.put('key-5', 1);
    await db.put('key-6', true);
    await db.put('key-7', false);
    await db.put('key-8', {});
    await db.put('key-9', {
        foo: 'bar',
        sub: {
            number: 5
        }
    });
    await db.put('key-10', null);

    db.createValueStream()
        .on('data', value => {
            console.log(value);
        });

    // => Output:
    // false
    // true
    // some value

}

main();