wvmarle:
No 5V regulator afaik; it does have a 3.3V regulator - the AMS1117-3.3. This regulator is also available on breakout board, complete with stabilisation caps & on-board power LED, pin compatible with standard TO-220 regulators such as the 7805. Very convenient.
If the NodeMCU does have an AMS1117-3.3, it's specified for 1 volt dropout (the minimum difference between Vin and Vout-regulated) which probably won't work so well with a LiPo input and 3.3 V working voltage. The MCP1825S-330 is a better choice with a 210 mV droput. Sadly, they aren't pin compatible in a SOT-223 package so swapping parts on the NodeMCU board is going to be a bit messy.
In a final consumer-grade product one also has to give some consideration to disconnecting the LiPo from the circuit when it has reached the fully discharged state so that the battery isn't damaged.