Depending on whether your resource manager is compliant with XA or not, set environment variables and implement different classes from the MicroTx client library.

• Configure Node.js Apps with an XA-Compliant Resource Manager
  Use the information provided in this section to configure your Node.js transaction participant applications when you use an XA-compliant resource manager.
• Configure Node.js Apps with a Non-XA Resource
  Use the information provided in this section to configure your Node.js transaction participant applications when you use a non-XA resource, such as MongoDB.