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Go to fragcoord.xyz, click on a shader and click the microscope icon to enter inspector. You can select variables or functions in your code to see what their values. This histogram automatically adjusts to any range and works with colors, coordinates, wave, whatever!

Error mode helps you track unexpected problems such as NaN (Not a Number), infinites and colors outside of the 0 to 1 range. You get a full list of lines that can cause NaNs and you can view each line individually just by hovering over them

Frames mode gives you a few of the overall frame rate, min, max, average and stutters.