Why Am I Getting an 'invalid character' Error When Unmarshaling JSON in Go?

Invalid Character Error in Go JSON Unmarshal

When attempting to post JSON containing an XML message, the error "invalid character 'b' looking for beginning of value" indicates an invalid JSON response from the server. This often occurs when the response body is not in JSON format.

The issue can be in the code where the response body is being parsed using json.Unmarshal. To debug this, follow these steps:

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
}

In this code:

• We first attempt to unmarshal the response body into the provided v interface.
• If the unmarshaling fails, we log the error.
• If the error is a json.SyntaxError, we log the exact byte offset where the syntax error occurred.
• Finally, we log the raw response body for debugging purposes.

By adding these logging statements, you can precisely identify the source of the invalid character error and determine why the server is not returning a valid JSON response.

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