circuit part :
The circuit is really simple all you need to do is connect the nodemcu Vin pin to Vcc of neopixel since we are using Vin pin of nodemcu for neopixel so don't use more than 5v as power for node mcu that's why i used usb cable supply then connect Gnd of nodemcu to Neopixel Gnd & Din pin of the neopixel to the D2 pin on nodemcu.
after downloading code, open it in ARDUINO ide & in the code set the neopixel pin to D2 ( whatever the pin of data of neopixel is connected to nodemcu) then number of pixels which mean the no of LEDs on your neopixel then imput your ssid of your router or mobile hotspot upload the code.
enclosure : i made a box of cardboard to cover the electronics & the cap of LED bulb as a diffuser to make the light uniform in all direction, you can design whatever you like.
In the final step let's the cable then the nodemcu will look for the network of which it has ssid & pass in the code and if network is found it will connect , now get any device connected to the same network or use same mobile of which you are using hotspot and from the browser type the IP as 192.168.4.1 (mine is 192.168.43.72 because i have changed it if you haven't changed yours try the given outside this bracket) and if you wanna know your ip then connect nodemcu to the PC & then open serial monitor & you'll get the IP then access the web server using that ip from browser & change the color brightness & mode of neopixel fron the browser & enjoy your own light show from your own MOOD LAMP .