Surprising array behavior encountered when using JSON.stringify on a particular site

I'm currently utilizing the JSON3 library, but I'm facing an issue where JSON.stringify is returning different results on a particular website. Unfortunately, the website requires login access, but I have included images for reference.

If someone has access to the 'concursolutions.com' portal, here is the homepage.

Some similarities between both scenarios include:

  1. Both functions are using the 'native function' (as shown in the image)
  2. Both pages are utilizing the HTML5 doctype (ie. <!DOCTYPE html>)
  3. Both have been tested on Chrome 59

Any suggestions on what else I should investigate? I'm running out of ideas.

The code snippet used:

JSON.stringify({'a':[1, 2]}, undefined, 1)

The unexpected behavior is shown in this image: https://i.sstatic.net/aoNB8.png

The expected behavior can be seen in this image:

https://i.sstatic.net/V5m3g.png

javascriptarraysjson

Answer №1

After much searching, I have finally discovered the answer to the problem at hand. It turns out that there is a bug in 'prototype.js' version 1.6.1.0.

The 'prototype.js' library actually modifies and overrides a significant number of 'native' functions.

One particular issue is that 'prototype.js' adds a 'toJSON' function to arrays, which ends up causing JSON.stringify to retrieve this modified value rather than the original value.

For more information on the behavior of 'toJSON', you can visit the following link:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#toJSON()_behavior

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