Node.js Example to convert Xml to JSON for large Xml file

I'm relatively new to Node.js. I'm trying to convert 83 XML files that are each around 400MB in size into JSON.

Each file contains data like this (except each element has a large number of additional statements):

<case-file>
  <serial-number>75563140</serial-number>
  <registration-number>0000000</registration-number>
  <transaction-date>20130101</transaction-date>
  <case-file-header>
     <filing-date>19981002</filing-date>
     <status-code>686</status-code>
     <status-date>20130101</status-date>
  </case-file-header>
  <case-file-statements>
     <case-file-statement>
        <type-code>D10000</type-code>
        <text>"MUSIC"</text>
     </case-file-statement>
     <case-file-statement>
        <type-code>GS0351</type-code>
        <text>compact discs</text>
     </case-file-statement>
  </case-file-statements>
  <case-file-event-statements>
     <case-file-event-statement>
        <code>PUBO</code>
        <type>A</type>
        <description-text>PUBLISHED FOR OPPOSITION</description-text>
        <date>20130101</date>
        <number>28</number>
     </case-file-event-statement>
     <case-file-event-statement>
        <code>NPUB</code>
        <type>O</type>
        <description-text>NOTICE OF PUBLICATION</description-text>
        <date>20121212</date>
        <number>27</number>
     </case-file-event-statement>
   </case-file-event-statements>

I have tried a lot of different Node modules, including sax, node-xml, node-expat and xml2json. Obviously, I need to stream the data from the file and pipe it through an XML parser and then convert it to JSON.

I have also tried reading a number of blogs, etc. attempting to explain, albeit superficially, how to parse Xml.

In the Node universe, I tried sax first but I can't figure out how to extract the data in a format that I can convert it to JSON. xml2json won't work on streams. node-xml looks encouraging but I can't figure out how it parses chunks in any manner that makes sense. node-expat points to libexpat documentation, which appears to requires a Ph.D. Node elementree does the same, pointing to the Python implementation but doesn't explain what has been implemented or how to use it.

Can someone point me to example that I could use to get started?