github.com/hashicorp/packer@v1.14.3/website/content/partials/from-1.5/legacy-json-warning.mdx (about)

     1  -> **Note:** This page is about older-style JSON Packer templates. JSON
     2  templates are still supported by the Packer core, but new features added to the
     3  Packer core may not be implemented for JSON templates. We recommend you
     4  transition to HCL templates as soon as is convenient for you, in order to have
     5  the best possible experience with Packer. To help you upgrade your templates,
     6  we have written an [hcl2_upgrade command](/packer/docs/commands/hcl2_upgrade).