jsoncompare.com | Source code for jsoncompare

This format: "[{\"id\":12,\"title\":\"Event 1\",\"start\":\ ...etc is the problem. You're double-serialising the data. See those outer quote marks (") and slashes \? The outer quote marks indicate that you are returning a simple string as the response (which is valid JSON, but will be treated as plain text by the parser), and the slashes are the result of having to escape the quote marks within the string. Thus the inner data, while it looks like JSON, is not treated as JSON by the client-side parser. Instead the whole thing is just treated as one big string, with no objects, properties etc within it.

In ASP.NET MVC, return Json... expects you to supply it with an object. It will then automatically serialise that to JSON for you. You don't need to serialise it before you pass it in. Just remove that code and send events directly to the Json() method:

Through a HEX Editor I checked the beginning of the file and I found out that my IDE added a BOM to the beginning of the file. So it looks like this:

[.. {.. "

As they are not recommended I chose to get rid of them by creating a new file with Explorer/Finder and adding my JSON in there.

You are looping with a global variable! In JavaScript all references and assignments that are not declared with var, let or const are global.

Thus whenever getStructure gets called i gets reset back to 0 for all instances. The variables sequence and innerSequence are also globals.

In addition your function name indicates that it shoudl return something other than undefined, which it currently returns.

There are missing semicolons. You should program with "use strict" to avoid that the engine dictates how to interpret your programn rather than you.