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Jetpack : SyntaxError: Unexpected token < in JSON at position 0

Sometimes,  Jetpack make us error for some reasons. Maybe there are so many situations and answers. However most case, if you have this error message on Jetpack connection,

“SyntaxError: Unexpected token < in JSON at position 0”

you need to save your permalink structure again. Log in to your site, go to Settings > Permalinks and at the very bottom click the “Save Changes” button. This is what fixes the issue.