This is an example of using the swagger-client package to authenticate with BitMEX and send requests.
swagger-client is especially nice because it exports an object that can call our methods directly.
You don't have to worry about headers or form encoding using this package - just call the methods are if they were direct RPC.
swaggerClient.js contains a simple example of how to use this.
If you're building your own project, copy the contents of this one into it.
In the near future we will release this as a standalone NPM module.
Most of the time, when using the API, you'll want to generate a permanent API key.
See also the official BitMEX documentation on authentication.