izzappel
commented
5 years ago I have the same problem. Since next.js is using querystring to parse the url, an array as a query param cannot be parsed anymore.
Having an array as a query property: { key: [1,2,3] }
gets this url: http://locahost:xxxx/path?key=1%2F2%2F3
Using the withRouter from next/routes the query has a string value then:
{ key: "1/2/3" } instead of parsing an array again.
Why can't you use the querstring.stringify function instead to be aligned with next.js?
with 'next/router' we can write Router.push({ pathname: pathname, query: { key:[1,2,3] } });