Building simple table from JSON.

Goodevening,

I am trying to build a html table from a json string which mostly looks like this

{'records': [{'id':'po-0167','x':'xx'},{'id':'po-0783', 'y':'yy'}]}

But I can't figure out how to formulate the loop required. I want a table, with 2 rows in this case (but that of course depends on how many records there are) and in this case 2 columns (but again, depends on the number of colums in the string...which varies)

the json can also look like

{'records': [{'id':'234','name':'marco','age':24},{'id':'0783', 'name':'silvia','age':33}]}

etc

how do I loop over this object without running out of scope or anything and have a html table build? (the table building itself is not important....)

Hope someone can provide me with an example.
Thank you very much.
Marco