do I need to use json() for just returning the data

[lili21]

export const loader = () => {
  return { hello: 'world' }
}

it works as expected. But I wanna know the different with json

export const loader = () => {
  return json({ hello: 'world' })
}

[sergiodxa]

The json functions returns a Response object, and aside of data you can pass a ResponseInit as second argument to customize the status code and headers.

When you don’t return a Response from the loader or action, Remix will pass your value to the json function and create the response for you.

[lili21]

is it a best practice to always wrap the data with json function even there is no second argument?

[kiliman]

Yes, I think so. It's definitely more explicit that you're returning a JSON response.