const bromba = require('bromba');

// all values will have to be 10 bytes Buffers
let db = bromba('/path/to/my/db.dat', { vlen: 10 });

// keys and values have to be Arrays of Buffer's
let keys = [2, 3, 4].map(x => Buffer.from([x]));

// for each key in an keys set corresponding value from values
await db.putMany(keys, values)


// values for each key from keys
const values = await db.getMany(keys);