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Discover how to format AWS CLI outputs using `JMESpath` for better readability in tables.
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Mastering JMESpath for Object Construction with AWS CLI

When working with AWS CLI to manage your cloud resources, you might find yourself needing to format output in a specific way to meet your reporting or monitoring needs. One common scenario is displaying a neat table that shows selected properties as rows. This guide delves into how to achieve this using JMESpath, a powerful querying language for JSON.

The Problem

You may have encountered situations where you can generate the desired output using tools like jq. However, when using the AWS CLI, your formatting options are somewhat limited. For instance, suppose you want to display a specific set of instance properties from EC2 as rows in a table format. As shown in the query:

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This provides the data in a tabular format but groups different objects across the columns, which does not look good when there are multiple items. So, how do you construct your output to have properties listed as rows instead of columns? Let’s explore the solution.

The Solution: Using JMESpath

To achieve your goal, you need to construct a JMESpath query that formats your data as individual entries per property. Here’s how you can do it step-by-step:

Step 1: Constructing the Query

The key to formatting your output correctly lies in how you structure your JMESpath query. Instead of selecting properties directly, you can create an object for each property. Use the following JMESpath query:

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Step 2: Understanding the JSON Structure

For this query to work, you need to understand the JSON structure that the AWS CLI returns. Here's a snippet of the JSON response you would be working with:

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Step 3: Running the Command

Use the following command in your terminal to display the data in your desired format:

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Step 4: Viewing the Output

The output will look like this in JSON format:

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When you run the command with the --output table flag, you’ll see:

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This table provides a clear view of your instance properties as desired.

Conclusion

Using the combination of AWS CLI and JMESpath, you can customize the output of your queries to present data in a clean and organized manner. This is especially useful when managing cloud resources, as it allows for quick insights and reporting. By formatting your output as shown, you can enhance readability and efficiency in your cloud management tasks.

Next time you need to retrieve instance details, remember this approach to make your outputs more user-friendly!