title: How to convert javascript unicode notation code to utf-8?
body: <p>Is there a command line tool or online service that can convert javascript unicode notation code to utf-8?</p>
  
  <p>E.g. I got this json code, but it is hard to edit in common text editor.</p>
  
  <pre><code>{"name":"leon zhang","city":"\u4e0a\u6d77"}
  </code></pre>
  
  <p>I want to convert it to:</p>
  
  <pre><code>{"name":"leon zhang","city":"上海"}
  </code></pre>