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> XML could have remained popular and we would not have had jason

One of the selling points of json is file size, xml started dying when people realized that more than half their bandwidth was going to xml structure rather than actual data

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Is the difference in size really significant? When the files are small it doesn't matter much, and when they are large you can throw some compression in the mix. I've never heard filesize as an argument for json before.

Imagine a table of numbers, the xml would be 90% repeated header names and structure. Now multiply that by hundreds of little Ajax requests, it added up.

This is hardly an issue for server side config files or CI/CD config stuff.

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