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

Mary-Kate Olsen
Mary-Kate OlsenOriginal
2024-12-20 07:24:14524browse

Why Am I Getting an

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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