Gist from mistakes.io

index.js

// You can include libraries in mistakes
// with a magic function called require(),
// which simply loads javascript in a script tag.

require('https://raw.github.com/lodash/lodash/2.3.0/dist/lodash.js');
require('https://raw.github.com/tyrasd/osmtogeojson/gh-pages/osmtogeojson.js');

osmtogeojson(
  {elements:[{type:"node",id:"-1",lat:1.23,lon:3.21}]},
  {flatProperties:true}
);