Скачать или смотреть Parsing JSON for CloudFormation: Converting to Key=Value Format with jq

Learn how to efficiently parse JSON CloudFormation parameters into a `Key=Value` format suitable for AWS CLI deployments using `jq`.
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Parsing JSON for CloudFormation: A Step-by-Step Guide

When working with AWS CloudFormation, you often face the challenge of handling parameters for stack creations and deployments. Specifically, while the aws cloudformation create command accepts JSON files for parameters, the aws cloudformation deploy command requires these parameters in an inline Key=Value format. In this guide, we’ll explore how to convert a JSON dictionary of CloudFormation parameters into the appropriate format using jq.

The Problem

You have a JSON file structured like this:

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You want to convert it to the following format, suitable for deployment:

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The Solution using jq

To achieve this goal, jq, a powerful command-line JSON processor, can be employed effectively. Below are the steps to parse and format the JSON data as required.

Step 1: Read the JSON File

Using the jq command, we will read the JSON file and transform it into the desired output format. The command you can use is as follows:

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Explanation of the Command

cat stack-params.example.json: This reads your JSON file.

jq -r '...': This executes a jq command with the -r option, which outputs raw strings instead of JSON-encoded strings.

map("(.ParameterKey)=(.ParameterValue)"): This transforms each object in the JSON array into a Key=Value string format.

join(" "): After mapping, this combines all strings into one single string, separated by spaces.

Resulting Output

When you run the command above, you will receive output formatted exactly as you require:

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Conclusion

Using jq to transform JSON is not only efficient but also straightforward once you understand the syntax. The command we discussed allows for quick parsing of AWS CloudFormation parameters into a deployment-friendly format. This makes it significantly easier to switch between stack creations and deployments without any manual reformats.

If you run into any issues with the conversion process or if you're curious about further functionalities of jq, feel free to reach out. Happy coding!