How to Fix \'invalid character \'ï\' looking for beginning of value\' Error When Unmarshalling JSON?

Invalid Character Error When Unmarshalling JSON with UTF-8 BOM

When attempting to unmarshal JSON data received from an HTTP request, you may encounter an error: "invalid character 'ï' looking for beginning of value."

This error arises when the server sends a UTF-8 text string that includes a Byte Order Mark (BOM). The BOM indicates the encoding type but should be stripped before decoding.

Solution:

Remove the BOM from the JSON data by using the following code:

body = bytes.TrimPrefix(body, []byte("\xef\xbb\xbf")) // Or []byte{239, 187, 191}

It's important to note that the UTF-8 BOM interpreted as an ISO-8859-1 string produces the characters , explaining the "ï" character in the error message.

By removing the BOM, the data can be successfully unmarshalled into the desired data structure (the TransformTextResponse in this case).

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