Why Does JSON Unmarshal Fail with 'Invalid Character 'b'' When Handling Embedded XML?

JSON Unmarshal Error: Invalid Character 'b'

When attempting to post JSON with embedded XML, you may encounter the error "invalid character 'b' looking for beginning of value." This error suggests that the server's response is not in the expected JSON format.

Inspecting the code reveals that the error occurs in the following snippet:

return json.Unmarshal(resBody, v)

To troubleshoot the issue, add the following debugging code:

err := json.Unmarshal(resBody, v)
if err != nil {
    log.Printf("error decoding sakura response: %v", err)
    if e, ok := err.(*json.SyntaxError); ok {
        log.Printf("syntax error at byte offset %d", e.Offset)
    }
    log.Printf("sakura response: %q", resBody)
    return err
}

By printing the error and any syntax errors, you can identify the exact byte offset where the invalid character is located. This will help determine if the issue lies in the server's response or in your JSON unmarshaling logic.

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