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    <p>If you happen to be in Rails then you'll have <a href="http://api.rubyonrails.org/classes/Hash.html#method-i-symbolize_keys" rel="noreferrer"><code>symbolize_keys</code></a>:</p> <blockquote> <p>Return a new hash with all keys converted to symbols, as long as they respond to <code>to_sym</code>.</p> </blockquote> <p>and <code>symbolize_keys!</code> which does the same but operates in-place. So, if you're in Rails, you could:</p> <pre><code>hash.symbolize_keys! </code></pre> <p>If you want to recursively symbolize inner hashes then I think you'd have to do it yourself but with something like this:</p> <pre><code>def symbolize_keys_deep!(h) h.keys.each do |k| ks = k.to_sym h[ks] = h.delete k symbolize_keys_deep! h[ks] if h[ks].kind_of? Hash end end </code></pre> <p>You might want to play with the <code>kind_of? Hash</code> to match your specific circumstances; using <code>respond_to? :keys</code> might make more sense. And if you want to allow for keys that don't understand <code>to_sym</code>, then:</p> <pre><code>def symbolize_keys_deep!(h) h.keys.each do |k| ks = k.respond_to?(:to_sym) ? k.to_sym : k h[ks] = h.delete k # Preserve order even when k == ks symbolize_keys_deep! h[ks] if h[ks].kind_of? Hash end end </code></pre> <p>Note that <code>h[ks] = h.delete k</code> doesn't change the content of the Hash when <code>k == ks</code> but it will preserve the order when you're using Ruby 1.9+. You could also use the <code>[(key.to_sym rescue key) || key]</code> approach that Rails uses in their <code>symbolize_keys!</code> but I think that's an abuse of the exception handling system.</p> <p>The second <code>symbolize_keys_deep!</code> turns this:</p> <pre><code>{ 'a' =&gt; 'b', 'c' =&gt; { 'd' =&gt; { 'e' =&gt; 'f' }, 'g' =&gt; 'h' }, ['i'] =&gt; 'j' } </code></pre> <p>into this:</p> <pre><code>{ :a =&gt; 'b', :c =&gt; { :d =&gt; { :e =&gt; 'f' }, :g =&gt; 'h' }, ['i'] =&gt; 'j' } </code></pre> <p>You could monkey patch either version of <code>symbolize_keys_deep!</code> into Hash if you really wanted to but I generally stay away from monkey patching unless I have very good reasons to do it.</p>
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    1. POHow do I convert a Ruby hash so that all of its keys are symbols?
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    1. USmu is too short
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    1. CO+1 Also if @ed1t doesn't user Rails, it's easy to see hot it's implemented there
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    2. COis there an option to call symbolize_keys recursively?
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    3. CO@ed1t: I think you'd have to do the recursive version by hand but it isn't terribly difficult, please see my update.
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