Convert output from cloudformation get-template-summary into an importable file

README.md

How to run the script

$ aws cloudformation get-template-summary --template-body file://template.yml > /path/to/summary.json
$ node index.js < /path/to/summary.json > /path/to/resources.json

Fill in the missing values in your the output file and import it.

$ aws cloudformation create-change-set \
  --stack-name stack-name \
  --change-set-name import \
  --change-set-type IMPORT \
  --resources-to-import file:///path/to/resources.json \
  --template-body file:///path/to/template.yml

index.js

let inputData = "";

process.stdin.setEncoding("utf-8");

process.stdin.on("data", (chunk) => {
  inputData += chunk;
});

process.stdin.on("end", () => {
  const { ResourceIdentifierSummaries } = JSON.parse(inputData);

  const output = ResourceIdentifierSummaries.reduce(
    (acc, { ResourceType, LogicalResourceIds, ResourceIdentifiers }) => {
      acc.push(
        ...LogicalResourceIds.reduce((a, LogicalResourceId) => {
          a.push({
            ResourceType,
            LogicalResourceId,
            ResourceIdentifier: ResourceIdentifiers[0]
              .split(",")
              .map((s) => s.trim())
              .reduce((a, k) => {
                a[k] = "";
                return a;
              }, {})
          });
          return a;
        }, [])
      );
      return acc;
    },
    []
  );

  console.log(JSON.stringify(output, null, 2));
});