Read the first few ingredients
Per food labeling laws, ingredients must be listed by order of weight from greatest to least. Inspect the first few ingredients on the list to figure out what your bar mostly comprises. A lot of ingredients doesn’t necessarily mean “bad.” It’s the quality of the ingredients that matters.
If you see anything listed after salt, you can count on it being a pretty miniscule amount. Sugar or syrup listed first on the list signifies a lot of added sugar, so you may want to bypass that bar. Nuts or whole soybeans listed first? That probably gets the go ahead.