TypeScript error after upgrading version 4 useParams () from react-router-dom Property 'sumParams' does not exist on type '{}'

useParams is generic. You need to tell typescript which params you are using by specifying the value of the generic

There are several ways to solve this

This is my favorite way

const { sumParams } = useParams<{ sumParams: string }>();

But there are a few more ways (:

OR

interface ParamTypes {
  sumParams: string;
}

Then in your Component

const { sumParams } = useParams<ParamTypes>();

OR

add any type without interface

const { sumParams } : any = useParams();

Note: that this way you will not be able to set it as a string

OR

More option for keemor:

const { sumParams } = useParams() as { 
  sumParams: string;
}

Another option is:

const { sumParams } = useParams() as { 
  sumParams: string;
}

To make it function as before, just add ":any"

const { sumParams } : any = useParams();

For newer versions of the router, generic is changed from object to union of strings.

const { param1, param2 } = useParams<'param1' | 'param2'>();

Current useParams type in the react-router types looks like this:

export declare function useParams<Key extends string = string>(): Readonly<Params<Key>>;

type ParamTypes {
  sumParams: string;
}

const { sumParams } = useParams<ParamTypes>()

this would be the clean approach to take

or

const { sumParams } = useParams<{[key: string] : string}>()

with this approach, you can get as many as param you want without declaring individually

You can also access the params from useRouteMatch if you already have it imported in your file

const curRoute = useRouteMatch();
// @ts-ignore
let sumParams  = curRoute.params.sumParams