How to add Typescript definitions to Express req & res

Question

I have a set of controller functions for my REST API and I\'m getting lots of the following

error TS7006: Parameter \'req\' implicitly has an \'any\' type.
         


        

Answer 1

Rather than installing types(@types/express) you should also define request parameters. Since every parameter is string, interface should base on dictionary.

Here is an inline route handler:

interface GetParams {
  [key: string]: string
  paramName: string
}

router.get('/:paramName', (req, res) => {
  res.send('Parameter is ' + req.params.paramName)
})