Error: The argument provided, 'ParsedQs', cannot be assigned to parameter XXXX

Question

Error: The argument provided, 'ParsedQs', cannot be assigned to parameter XXXX

I have a unique function along with an interface that defines its single argument:

interface AnotherInterface {
    property1: string;
    property2: string;
}

function processData(data: AnotherInterface): Promise<any> {
    return Promise.resolve(data)
}

This particular function serves as a controller in an express application:

router.get('/document', (req, res) => {
    processData(req.query).then(data => res.status(200).send(data))
})

When passing req.query to processData, TypeScript highlights it and prompts:

The argument of type 'ParsedQs' cannot be assigned to the parameter of type AnotherInterface

Looking for ways to resolve this issue?

typescript express

Answer 1

Answer №1

Instead of directly casting req.query to your interface, you can use this alternative approach:

router.get('/file', (req, res) => {
    const query = req.query as unknown as CustomInterface;
    processData(query).then(result => res.status(200).send(result))
})

Answer 2

Instead of directly casting req.query to your interface, you can use this alternative approach:

router.get('/file', (req, res) => {
    const query = req.query as unknown as CustomInterface;
    processData(query).then(result => res.status(200).send(result))
})

Error: The argument provided, 'ParsedQs', cannot be assigned to parameter XXXX

Answer №1

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