You copied some JSON, the parser exploded, and the error says something like: Unexpected token ' in JSON at position 2 The culprit is almost always single quotes. Here's exactly why it happens and how to fix it safely. Why JSON is this strict about quotes JSON was designed to be boring on purpose. Every parser, in every language, agrees on what a string is because the format only allows double quotes. No exceptions. JavaScript makes this feel confusing. Single quotes are perfectly valid in a JS object literal — but a JS object literal is not JSON. The moment that payload hits JSON.parse(), the JSON rules win. The three patterns people hit most Invalid: all single quotes { 'name': 'StructKit' , 'mode': 'validator' } Enter fullscreen mode Exit fullscreen mode Invalid: even just one { "name" : 'StructKit' , "mode" : "validator" } Enter fullscreen mode Exit fullscreen mode One single-quoted value is enough to blow up the whole payload.…