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I have a bit of JSON coming from a mock that needs to de deserialized into an object. The JSON itself is perfectly valid. It has been validated by multiple services, and they all say it looks legit.

However, I consequently get

System.JSONException: Unexpected character ('\' (code 92)): was expecting double-quote to start field name at [line:1, column:3]

Which is odd, because there is not even a single backslash character in the file.

Then, when I fold the JSON into 'compact' form, removing all spaces, tabs, indentation etc, it suddenly works.

Any clues? Anybody had something similar before?

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  • Can you post sample json response. Also validate json response which you get.
    – Reshma
    Dec 17, 2018 at 9:58
  • Sorry can't post it, it is a huge file and contains confidential details. I was just wondering if it rings a bell with someone who had experienced an identical situation. And yes, as mentiond, I validated the JSON multiple times using different linters/validators. Dec 17, 2018 at 10:02
  • Found similar issue here
    – Reshma
    Dec 17, 2018 at 10:05
  • Sounds like an encoding issue or something. Since it's at 1:3, maybe you could just give us like... the first 5-6 characters of your JSON? Or just look for anything unusual around that location.
    – sfdcfox
    Dec 17, 2018 at 10:58
  • leading line break?
    – cropredy
    Dec 18, 2018 at 1:55

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