How to Parse JSON File in Golang and Extract Key Information

Описание: Discover the step-by-step process to effectively parse a JSON file in Golang and extract important details like names and methods with ease.
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This video is based on the question https://stackoverflow.com/q/64693710/ asked by the user 'Elune Chan' ( https://stackoverflow.com/u/14582271/ ) and on the answer https://stackoverflow.com/a/64693841/ provided by the user 'cn007b' ( https://stackoverflow.com/u/3612353/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Parse JSON File in Golang and Extract Key Information

Handling JSON files is a common task for many programmers, especially when dealing with APIs or configuration files. In this guide, we will walk through the steps needed to parse a JSON file in Golang and extract key information, such as names and methods, for easy display in the terminal.

Understanding the Problem

Let's say you have a JSON file structured as shown below, with various items containing names and requests:

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Your goal is to parse this JSON and see specific details (the name and the method) printed in your terminal.

The Solution

An effective way to achieve this in Golang is through a structured approach that includes creating appropriate data structures, reading the JSON file, and then unmarshalling it. Let's break this down step by step.

Step 1: Define Your Data Structures

You need to define the structures that map to the JSON data. In this case, we will create a structure for the overall data and for each item within it.

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Step 2: Opening the JSON File

Now, you'll want to open the JSON file and read its contents. Here's how you do that:

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Step 3: Reading and Unmarshalling the JSON

Next, we need to read the contents of the file and unmarshal the JSON data into our defined structures.

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Step 4: Printing the Results

Finally, iterate through the items in your data structure and print the desired information.

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Complete Code Example

Here's the full example combining all the steps:

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Expected Output

When you run this program, the output should look like this:

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Conclusion

By following the steps highlighted in this post, you should now be able to effectively parse a JSON file using Golang and extract names and methods with ease. This not only improves your understanding of how JSON structures work but also enhances your Golang programming skills. Happy coding!