Finder spotlight tool not "grepping" through all file types?

We've got this development stack that's mostly javascript, and if I'm looking for a variable definition or something I can use Finder's spotlight tool to easily find the file that contains the variable I'm looking for. However if there's something I'm looking for that I know is in a JSON file, Finder won't return anything. I looked through Finder's preferences as well as Spotlight's but couldn't find anything about extensions. Does anyone know a fix for this? Or maybe an alternative to Finder/Spotlight? Thanks in advance

Solution 1:

You can use Bare Bones’s TextWrangler (from the makers of BBEdit). It has a Multi-File Search function that is easy to use and pretty useful.

Nice: TextWrangler is free.