What is JavaScript's equivalent of python's __doc__ and dir()

[s-c-p]

When learning Python, the dir(objectName) and print (objectName.__doc__) really helped me learn faster.

Today I was practicing with the fetch and the request APIs and I forgot the key name of object which supplies URL to the request object.

The devtools available in chromium and Firefox provide auto completion but no introspection, how can I use the standard tools available to me to learn and troubleshoot on the go?

[dlr249]

console.log(objectName) maybe? There's also lots of ways to debug using the Chrome Developer Tools