Why JSON_Decode Fails with Syntax Error When Online Validator Shows Validity?

JSON_ERROR_SYNTAX: Online Validator Indicates Validity

Encountering JSON_ERROR_SYNTAX when using json_decode can be frustrating, especially when online validators suggest the JSON is syntactically correct.

The JSON_ERROR_SYNTAX error indicates that json_decode encountered an invalid JSON syntax. However, as mentioned in the question, the online formatter validates the JSON as valid.

To resolve this issue, consider the following troubleshooting steps:

1. Check for Hidden Characters: Sometimes, hidden characters that are invisible to the eye can cause json_decode to fail. The provided PHP code in the answer ensures that Unicode characters between 0 and 31, as well as the specific character 127, are removed from the JSON string.
2. Remove 'efbbbf' Encoding: Some JSON files begin with the 'efbbbf' encoding to indicate the start of the file. This sequence can interfere with json_decode, so removing it is recommended.
3. Custom Error Message Function: For PHP versions 5.5 and above, the json_last_error_msg() function can provide a more detailed error message. However, as mentioned in the question, this function may not be readily available.

By implementing these troubleshooting steps, you can potentially resolve the JSON_ERROR_SYNTAX issue and successfully decode the JSON using json_decode.

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