The following reasons will cause Json verification to fail
The reason for the error that makes it difficult for you to find out the truth:
1, the non-numeric key value in the Json string does not have double quotes
2. There is a tab character like \t in Json, which looks the same as a space, but because of its existence, the verification fails, so just remove it.
3. The Bom header in the editor will also cause the Json verification to fail