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@BayuAngora Assuming
blog.jsonis a directory data file you can add apermalinkin there that sets a default for everything in the directory 11ty.dev/docs/permalinks/#use-data-variables-in-permalink 11ty.dev/docs/data-template-dir/
blog.json is a directory data file you can add a permalink in there that sets a default for everything in the directory
11ty.dev/docs/permalinks/#use-data-variables-in-permalink
11ty.dev/docs/data-template-dir/