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    <p><strong>Solution 1</strong></p> <p>Use JSON.stringify(obj) to get a string representation of the objects you want to compare. Save the string to a file. Use any diff viewer to compare the text files.</p> <p>Note: JSON.stringify will ignore properties that point to function definitions.</p> <p><strong>Solution 2</strong></p> <p>This could do what you want with some modification, it is a modified version of the function _.isEqual (<a href="http://documentcloud.github.com/underscore/insp" rel="nofollow">http://documentcloud.github.com/underscore/</a>). Please feel free to suggest any modifications! I wrote it to figure out where the first difference between two objects occur.</p> <pre><code>// Given two objects find the first key or value not matching, algorithm is a // inspired by of _.isEqual. function diffObjects(a, b) { console.info("---&gt; diffObjects", {"a": a, "b": b}); // Check object identity. if (a === b) return true; // Different types? var atype = typeof(a), btype = typeof(b); if (atype != btype) { console.info("Type mismatch:", {"a": a, "b": b}); return false; }; // Basic equality test (watch out for coercions). if (a == b) return true; // One is falsy and the other truthy. if ((!a &amp;&amp; b) || (a &amp;&amp; !b)) { console.info("One is falsy and the other truthy:", {"a": a, "b": b}); return false; } // Unwrap any wrapped objects. if (a._chain) a = a._wrapped; if (b._chain) b = b._wrapped; // One of them implements an isEqual()? if (a.isEqual) return a.isEqual(b); // Check dates' integer values. if (_.isDate(a) &amp;&amp; _.isDate(b)) return a.getTime() === b.getTime(); // Both are NaN? if (_.isNaN(a) &amp;&amp; _.isNaN(b)) { console.info("Both are NaN?:", {"a": a, "b": b}); return false; } // Compare regular expressions. if (_.isRegExp(a) &amp;&amp; _.isRegExp(b)) return a.source === b.source &amp;&amp; a.global === b.global &amp;&amp; a.ignoreCase === b.ignoreCase &amp;&amp; a.multiline === b.multiline; // If a is not an object by this point, we can't handle it. if (atype !== 'object') { console.info("a is not an object:", {"a": a}); return false; } // Check for different array lengths before comparing contents. if (a.length &amp;&amp; (a.length !== b.length)) { console.info("Arrays are of different length:", {"a": a, "b": b}); return false; } // Nothing else worked, deep compare the contents. var aKeys = _.keys(a), bKeys = _.keys(b); // Different object sizes? if (aKeys.length != bKeys.length) { console.info("Different object sizes:", {"a": a, "b": b}); return false; } // Recursive comparison of contents. for (var key in a) if (!(key in b) || !diffObjects(a[key], b[key])) return false; return true; }; </code></pre>
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