If you need to make money really quickly, your best bet might be to sell something of value. For example, you can sell a piece of jewelry at a pawn shop or jewelry store. If you have an old smart phone or tablet lying around, you may be able to get instant cash for it from an ecoATM kiosk. Keep in mind that while these methods are easy and super quick, they won’t get you the best value for your goods.
A side gig related to web development is web design. While a web developer focuses most on a website's back-end, a web designer will focus on its front-end -- the user experience. They will design the site to be attractive and also functional. Many small businesses need help with web design, and you may even be able to win some business by approaching some and offering to improve their sites.