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Go language is a programming language for developing efficient and reliable programs. The built-in JSON library can help developers better parse and generate JSON data format. But sometimes, developers may encounter some problems, such as the JSON library not being used correctly.
So what exactly causes this situation? This article will explain it from the following aspects:
In the Go language, the two methods Marshal and Unmarshal in the JSON library are both different during execution. A structure object needs to be passed in. However, when passing in a structure, you must ensure that all field names begin with a capital letter. If a field in a structure does not comply with this rule, the JSON library may not be used correctly.
This is because in the Go language, only fields starting with a capital letter can be correctly recognized and parsed by the JSON library. Otherwise, the JSON library will consider this field to be private and cannot perform correct operations. Therefore, if you encounter a situation where the JSON library cannot be used correctly, you need to check whether the field names passed in the structure comply with the specifications.
When parsing JSON, the JSON library will convert it into different Go language types according to the type of the value, such as characters in JSON Convert string to string type in Go language. But sometimes, the JSON library cannot correctly determine the type of the value, resulting in type conversion errors.
For example, if the value of a field in JSON data can be either a string type or an array type, the JSON library cannot correctly determine its type. At this time, developers need to manually specify the type of the field or split it into multiple fields.
In the Go language, developers can add "tag" to the structure field to specify the name of the field or other metadata. When used for JSON parsing, these tags are called "JSON tags" and can specify the name, format and other attributes of the corresponding fields in the JSON data.
When using the JSON library to parse or generate, if the JSON tag is not defined in the structure field or the JSON tag is incorrect, it may not run correctly. Therefore, developers need to carefully check the JSON markup in the structure to ensure that it is correct.
Finally, if the JSON data itself has formatting issues, such as missing necessary punctuation or non-standard JSON format, the JSON library will not be able to Parse correctly. At this time, developers need to format the JSON data or fix errors first.
Summary
It is a very common operation to use the JSON library to parse and generate data in Go language development. However, when using the JSON library, developers also need to pay attention to some issues that may cause the JSON library to fail to work correctly, such as encoding issues, type conversion issues, field tagging issues, and JSON format issues.
Through developers checking the above problems one by one based on the actual situation, the occurrence of such problems can be effectively reduced, thereby bringing higher efficiency and accuracy to the development and testing of our Go programs.
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