How do I create a countdown timer with use-timer in React?

Set timerType to 'DECREMENTAL', define an endTime, and use the onTimeOver callback for actions when the timer reaches zero. The hook manages the countdown logic automatically, as shown in the decremental timer example.

use-timer vs using setInterval directly: which is better for React apps?

use-timer abstracts setInterval management, providing built-in state and callbacks, reducing boilerplate and potential bugs. However, for very simple or one-off timers, direct setInterval might suffice with more manual control.

Can I use use-timer for a Pomodoro timer application?

Yes, by configuring decremental timers for work intervals and using callbacks to switch between sessions. However, you'll need to handle session logic externally as use-timer doesn't support timer chains or advanced scheduling.

How to handle multiple timers with use-timer in a single component?

Call the useTimer hook multiple times with different configurations. For synchronization, manage state externally, as use-timer doesn't provide built-in coordination between timer instances.

Does use-timer work with server-side rendering (SSR) in Next.js?

The README doesn't specify SSR compatibility. Since it uses React hooks, ensure it's only called on the client-side to avoid hydration errors, possibly using dynamic imports or useEffect checks.

How to reset a timer to its initial time after it has run?

Use the reset method provided by the hook, which stops the timer and sets time back to initialTime. This is shown in the basic usage example with the reset button for quick UI updates.

Open-Awesome

use-timer

MITTypeScriptv2.0.1

A React hook for creating and managing timers with start, pause, reset, and callback functionality.

GitHub

205 stars24 forks0 contributors

What is use-timer?

use-timer is a React hook that provides a simple and flexible way to manage timers in functional components. It solves the problem of handling timer logic—like starting, pausing, resetting, and tracking elapsed time—without manual setInterval or setTimeout management. The hook supports both incremental and decremental timers with configurable options and callbacks.

Target Audience

React developers building applications that require timers, such as countdowns, stopwatches, quizzes, or any time-based UI interactions.

Value Proposition

Developers choose use-timer for its minimal API, zero dependencies, and ease of integration—reducing timer-related boilerplate while offering features like callback support, status tracking, and flexible configuration out of the box.

Overview

A timer hook for React

Use Cases

Best For

Implementing countdown timers in React apps
Building stopwatch or elapsed time features
Creating quiz or exam timers with pause/reset
Adding time-based UI updates (e.g., progress bars)
Managing timed animations or transitions
Developing Pomodoro timers or productivity tools

Not Ideal For

Projects requiring sub-millisecond precision or high-frequency timer updates
Non-React applications or frameworks like Vue.js or Angular
Complex use cases with multiple, synchronized timers needing advanced management

Pros & Cons

Pros

Lightweight and Dependency-Free

With a minimal bundle size and zero dependencies, use-timer adds negligible overhead, as shown by its small gzip size on BundlePhobia.

Flexible Timer Configuration

Supports both incremental and decremental timers with configurable intervals, steps, and end times, allowing for diverse timer types from countdowns to stopwatches.

Intuitive API and Controls

Provides simple methods like start, pause, reset, and advanceTime, reducing boilerplate code for common timer operations, as demonstrated in the basic usage examples.

Callback and Status Tracking

Includes onTimeUpdate and onTimeOver callbacks for event handling, along with real-time status (RUNNING, PAUSED, STOPPED) for easy UI integration.

Cons

Limited to React Ecosystem

As a React-specific hook, it cannot be used in other JavaScript frameworks or vanilla JS projects, restricting its applicability.

No Advanced Timer Features

Lacks support for lap times, splits, or dynamic interval adjustments, which are essential for more complex timer applications like multi-stage stopwatches.

Potential Interval Drift

Relies on setInterval which can accumulate timing errors over long periods, making it less reliable for precise, long-running timers without manual corrections.

Frequently Asked Questions

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