osmium.js

var osmium = require('osmium');
    levelup = require('levelup');

var db = levelup('./test.ldb');
var count = 0;

var reader = new osmium.Reader(process.argv[2], {
    'node': true
});

function nextBuffer() {
    console.log('buffer', count);
    var buffer = reader.read();
    if (!buffer) return false;

    var batch = [];

    while (object = buffer.next()) {
        batch.push({
            type: 'put',
            key: object.id,
            value: JSON.stringify(object)
        });
    }

    db.batch(batch, function(err) {
        if (err) return console.log(err);
        // return setTimeout(nextBuffer, 2500);
        return nextBuffer();
    });
    count++;
}

nextBuffer();

package.json

{
  "name": "openstreetreports",
  "version": "0.0.0",
  "description": "",
  "main": "",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "BSD",
  "dependencies": {
    "leveldown": "^0.10.1",
    "levelup": "^0.19.0",
    "osmium": "https://github.com/osmcode/node-osmium/tarball/master"
  }
}