var Poziomka = require('poziomka'); let db = new Poziomka('/path/to/my/db'); // no encoding/decoding - poziomka works with Buffers let keys = [2, 3, 4].map(x => Buffer.from([x])); db.open(function(err) { if (err) { // something went wrong } // database is not open }); // keys and values have to be Arrays of Buffer's db.putMany(keys, values, function(err) { // for each key in an }); // keys and values have to be Arrays of Buffer's db.getMany(keys, function(err, values, missing) { if (err) { // leveldb error } if (missing) { // some of the keys were not in DB // missing has indexes in the keys array, so to print the keys console.log('Missing keys:', missing.map(i => keys[i])); } // empty Buffer is returned for each missing key }); db.removeMany(keys, function(err) { // keys are now deleted });