Why Does My Go JSON Decoding Fail with 'Invalid Character 'b' Looking for Beginning of Value'?

JSON Decoding Error: "Invalid Character 'b' Looking for Beginning of Value"

When attempting to decode a JSON response into a Golang object, developers may encounter the "invalid character 'b' looking for beginning of value" error. This issue typically occurs when the server returns a non-JSON response, which could be due to incorrect content negotiation or a server error.

To troubleshoot this error, one should first examine the response body, which contains the raw data received from the server. By printing the response body using log.Printf("sakura response: %q", resBody), developers can inspect the data and verify if it is in JSON format.

If the response body is not in JSON format, the error can be attributed to incorrect content negotiation. In such cases, it is essential to ensure that the server is configured to send JSON responses. Additionally, verifying that the client's request headers are set correctly to accept JSON content is crucial.

Once the correct content negotiation is established, developers should inspect the response body further. The error message provides the byte offset of the invalid character. This information can be used to examine the response body and identify the source of the error.

To provide additional context and assist in debugging, developers can log the value of the json.SyntaxError if an error is encountered during unmarshalling. The json.SyntaxError.Offset field indicates the position of the invalid character in the response body.

By utilizing these debugging techniques, developers can effectively pinpoint the cause of the error and resolve issues related to invalid JSON responses in their Golang applications.

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