Creating objects from array to json object

Question

I have an array of object like this

[
    {"id": "1", "name": "test"},
    {"id": "2", "name": "test2"},
    {"id": "3", "name": "test3"}
]

I want to convert it to object list this

{
  "1": {"name": "test"},
  "2": {"name": "test2"},
  "3": {"name": "test3"},
}

"Creating objects from array to json object" sigh It's not a "json object." It's just an object. JSON is a textual notation for data interchange. — T.J. Crowder
– T.J. Crowder, Commented Apr 29, 2014 at 10:47
Why in first place didn't you generate an object instead of an array of objects? Maybe this array comes from any third party script but i have to ask it. — A. Wolff
– A. Wolff, Commented Apr 29, 2014 at 10:57

Denys Séguret · Accepted Answer · 2014-04-29 10:51:15Z

6

You may use reduce :

var obj = arr.reduce(function(m,o){ m[o.id]={name:o.name}; return m }, {});

Side note : please be sure to read and try to understand T.J.'s comment about JSON

edited Apr 29, 2014 at 10:51

answered Apr 29, 2014 at 10:45

Denys Séguret

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3 Comments

T.J. Crowder Over a year ago

@ OP - Note that Array#reduce requires a modern browser or a shim; if you need to support older browsers like IE8, search for "es5 shim" for options.

Denys Séguret Over a year ago

@T.J.Crowder You're right but isn't it time we stop telling that ? After all even gmail stopped supporting IE9 long ago (this is a question, not a critic of the comment).

T.J. Crowder Over a year ago

@ dystroy: My take is that when 6% to 21% of people globally are still using a browser (IE8), it's still relevant and important. Despite the XP deadline having passed, I suspect we're stuck with IE8 a while longer. I can't afford for even 6% of my users to have my site fail with a random script error. And the note is easy to add. Now of course, the only stats that really matter are the stats for one's own site...

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