javascript - Why is fs.readFile returning a buffer? -

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I have already mentioned that is it, I do not believe that my problem is in the misunderstanding of Asyn.

Here is the relevant part of my module 

  var fs = is required ('FS'); Var q = requirement ('q'); Var u = is required ('../ utils / json'); Var indexFile = './data/index.json'; Function getIndex () {var def = q.defer (), promise = def.promise, obj; Fs.readFile (indexFile, function (error, data) {if (mistake) {throw error; def.reject (err);} console.log ('data', data); def.resolve (obj);}); Return promise; }   
 When I log out 'data', I am getting buffer (bottom) instead of JSON content of that file.    & lt; Buffer 5b7b 22 68 65 6c6c6f223a22 77 6f72 6c 64 22 7d5d> gt;   
 Any thoughts on why? According to  
 
, if the  encoding  option is not passed,  Read  function will return a buffer  
 If you pass a value for encoding, then it will return a string with that encoding:  
  fs .readFile ('/ etc / passwd', 'utf-8', callback)

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