In my opinion most parsers are just too lax. They support some fancy extension at the beginning (like comments, which are not a good idea), get more and more "feature-rich" and then support syntax that is not specified in the standard.
Other parsers now have to lower their "standard" (no pun intended) to compete which leads to more complex edge-cases that we also find in undefined behaviour and compilers.
E.g. if your HTML is broken, it mostly renders somehow in your browser, which is in my opinion bad design - the same is probably true with JSON.
Other parsers now have to lower their "standard" (no pun intended) to compete which leads to more complex edge-cases that we also find in undefined behaviour and compilers.
E.g. if your HTML is broken, it mostly renders somehow in your browser, which is in my opinion bad design - the same is probably true with JSON.