Sanitise object keys for insertion into MongoDB

gistfile1.md

I wanted to store the response from an API call in a MongoDB document collection.

However, some of the keys present in the object hierarchy started with a $ character, which MongoDB doesn't allow.

Therefore I needed a function to recursively iterate through the object hierarchy and replace all instance of $ at the start of key names with a different character – I chose @.

This is what I came up with:

var replaceDollarsAtStartOfKeys = function(obj) {
  for (var property in obj) {
    if (obj.hasOwnProperty(property)) {
      if(typeof obj[property] == "object") {
        replaceDollarsAtStartOfKeys(obj[property]);
      }

      if(property[0] == '$') {
        obj['@' + property.substr(1)] = obj[property];
        delete obj[property];
      }
    }
  }
};