Why Am I Getting an \'invalid character \'\\x00\' after top-level value\' Error When Unmarshalling JSON in Go?

Invalid Character Error in JSON Unmarshalling

In Go, attempting to unmarshal JSON data may result in the error "invalid character 'x00' after top-level value." This error typically appears when subsequent iterations of a loop encounter an issue during the unmarshalling process.

Cause:

This error occurs when a non-whitespace character follows the end of a valid JSON top-level value, such as "}" or "]", at the end of the JSON string.

Resolution:

To resolve this error, check the following:

• Ensure that the JSON string being unmarshalled ends with only whitespace characters.
• Avoid using malformed JSON strings that contain additional non-whitespace characters at the end.
• Resize buffers used for unmarshalling to match the exact length of the received data. This prevents extra "x00" characters from being included in the buffer, which can cause the error.

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