What tasks are best solved with client components?

Next.jsMiddle~1 min read

Client components in Next.js should be used for tasks where the interface must react to user actions in the browser. In short: everything "live" and interactive is the client.

Short answer (for an interview)

Client components are better suited for:

interactive UI
managing interface state
working with browser APIs
effects and animations

If you need useState, useEffect, or onClick - it's a client component.

1. User actions and interactivity

Buttons, clicks, events:

tsx

'use client'

export function LikeButton() {
  return <button onClick={() => alert('Like')}>Like</button>
}

Also included here:

forms
submit
hover
drag & drop

2. Managing UI state

When you need to store state:

whether a modal is open
whether a tab is selected
an input's value
the current filter

tsx

'use client'

const [isOpen, setIsOpen] = useState(false)

Server components cannot store UI state.

3. Forms and live validation

controlled inputs
validation on the fly
showing errors
autofill

tsx

'use client'

<input value={email} onChange={...} />

Even if the form submission goes to the server, the form's UI is client-side.

4. Effects and lifecycle

If you need:

useEffect
subscriptions
timers
WebSocket
polling

tsx

'use client'

useEffect(() => {
  const id = setInterval(...)
  return () => clearInterval(id)
}, [])

5. Working with browser APIs

Only client components can work with:

window
document
localStorage
sessionStorage
navigator
IntersectionObserver

localStorage.getItem('theme')

6. Animations and UI libraries

Most UI libraries require the client:

modals
dropdowns
tooltips
popovers
animations (Framer Motion, etc.)

That's why it's common to make:

a server layout
client UI widgets inside it

7. Client state and stores

If you use:

Redux
Zustand
React Context (for UI)
SWR / React Query (on the client)

These are client components.

Typical tasks - a short list

buttons and forms
modal windows
dropdown / tabs
filters and sorting in the UI
animations
live validation
client stores
effects and subscriptions

Short Answer

Interview ready

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