In reality, that doesn’t always happen.

In some projects, custom hooks genuinely improve readability and reuse. In others, they make the code harder to follow, harder to debug, and harder for new developers to understand. I’ve experienced both sides.

This article isn’t about how to write a custom hook. It’s about when they actually help and when they don’t, based on how I use them in real Next.js applications.

The Problem Custom Hooks Are Supposed to Solve

Custom hooks exist to extract reusable client-side logic. Not UI. Not markup. Just logic.

When used well, they:

• Reduce duplication

• Make components easier to read

• Encapsulate behavior that’s shared across components

When used poorly, they:

• Hide important logic

• Create unnecessary indirection

• Make simple components harder to understand

The difference usually comes down to judgment, not syntax.

Custom Hooks in Next.js

One important thing to remember in Next.js is that hooks only run in client components.

That means:

• Any file using a hook must be a client component

• Hooks don’t belong in server components

• Hooks are tied to "use client" whether directly or indirectly

This alone is enough reason to be careful. Overusing hooks can easily push more of your app into the client than necessary, which defeats some of the benefits of the App Router.

Creating a Custom Hook

I usually create a custom hook when I see the same client-side logic repeated in multiple places.

Some common examples:

• Form state and validation logic

• Toggle logic for modals or dropdowns

• Client-side data fetching that’s reused

• Shared UI behavior like pagination or filters

In these cases, a hook helps by:

• Keeping components focused on rendering

• Making intent clearer

• Reducing copy-paste logic

If extracting the hook makes the component easier to read, it’s usually a good sign.

Avoiding a Custom Hook

Just because logic can be extracted doesn’t mean it should be.

I avoid creating hooks when:

• The logic is used in only one place

• The logic is very small or obvious

• The hook becomes more complex than the component

• Reading the hook requires jumping through multiple files

Sometimes keeping logic inline is simply more honest.

I’ve learned that clarity beats abstraction almost every time.

Hook Size and Responsibility

One mistake I’ve made in the past is creating hooks that do too much.

When a hook:

• Manages state

• Fetches data

• Handles side effects

• Formats values

…it starts becoming harder to reason about.

Now, I try to keep hooks focused on one responsibility. If a hook keeps growing, it’s usually a sign that it should be split or partially moved back into the component.

Common Mistakes I’ve Seen (and Made)

Some patterns I’ve seen repeatedly:

• Creating hooks too early, before reuse actually exists

• Making overly generic hooks that don’t fit real use cases

• Poor naming that hides what the hook actually does

• Hooks that leak internal implementation details

Most of these come from trying to be “clever” instead of being clear.

How I Organize Custom Hooks in a Next.js App

I don’t believe in a single global hooks folder for everything.

My general approach:

• Feature-specific hooks stay close to the feature

• Truly shared hooks live in a shared location

• Hooks that are only used once stay in the component

This keeps the relationship between logic and UI obvious.

How I Decide in Real Projects

Before creating a custom hook, I usually ask myself:

• Is this logic reused?

• Is this client-only?

• Does extracting it improve readability?

• Will someone new understand this hook without context?

If the answer isn’t clear, I usually don’t create the hook yet.

You can always refactor later once patterns become obvious.

Custom hooks are a powerful tool, but they’re not a goal by themselves.

Used well, they simplify code and improve maintainability. Used poorly, they add layers of abstraction that don’t actually help.

In Next.js, where client and server boundaries already exist, being intentional about hooks matters even more.

For me, the rule is simple:
If a hook makes the code easier to read and reason about, it’s worth it. If it doesn’t, it probably isn’t.