Скачать или смотреть How to Fix JSON Unmarshalling Errors in Go with base64 Encoding

Learn how to deal with JSON unmarshalling errors in Go by using `base64` encoding for hex data and improve your Go programming skills!
---
This video is based on the question https://stackoverflow.com/q/62339757/ asked by the user 'camulos king' ( https://stackoverflow.com/u/13530461/ ) and on the answer https://stackoverflow.com/a/62341513/ provided by the user 'M Rostami' ( https://stackoverflow.com/u/1087547/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: golang json.Unmarshal to struct []byte

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding JSON Unmarshalling in Go

If you are working with Go and dealing with JSON data, you may encounter some challenges when trying to unmarshal JSON strings into Go structs. One common issue involves errors arising from improperly formatted data. In this post, we will focus on a specific problem related to JSON unmarshalling and provide a detailed solution.

The Problem: JSON Unmarshalling Error

Recently, I came across an interesting scenario while working with a Go program. The goal was to unmarshal JSON data containing a hex string into a struct. The code snippet below illustrates the problem:

[[See Video to Reveal this Text or Code Snippet]]

Running the above code results in the following error:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that the unmarshalling process is failing due to the format of the info field. Specifically, Go's JSON unmarshalling does not know how to handle the hex string prefixed with 0x.

Why Does This Happen?

The Info field in the TTT struct is defined as a []byte, but the value being assigned from the JSON string is not a valid byte representation. Instead, it is a hex representation that needs to be properly encoded.

The Solution: Use Base64 Encoding

To resolve this issue, we can encode the hex string into base64. This way, the JSON unmarshaller can process the data correctly. Let’s break down the improved code:

Step-by-Step Solution

Import Required Packages
First, make sure you import the necessary packages:

[[See Video to Reveal this Text or Code Snippet]]

Define the Struct
We will use the same struct definition as before:

[[See Video to Reveal this Text or Code Snippet]]

Encode the Hex Data
Before we build the JSON string, we need to encode the hex data into base64:

[[See Video to Reveal this Text or Code Snippet]]

Create the JSON String
Format the JSON string to include the base64 encoded data:

[[See Video to Reveal this Text or Code Snippet]]

Unmarshal the JSON
Now, you can attempt to unmarshal the JSON string into the TTT struct:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example

Here’s the complete code for clarity:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By encoding your hex data into base64, you can avoid common JSON unmarshalling errors in Go. This approach not only ensures smoother data processing but also enhances the overall functionality of your applications. Now, next time you face an issue when unmarshalling JSON data, consider checking the format of your input and leverage base64 encoding.

Keep coding in Go, and don't hesitate to explore more solutions to enhance your programming skills!