Question 1

How do I generate a blurhash string from an image in my React Native app?

Accepted Answer

Use the Blurhash.encode() function, which runs asynchronously on a background thread. Provide the image URI and dimensions (e.g., 4x3), and it returns a compact blurhash string for use in placeholders, as shown in the encoding example.

Question 2

Is blurhash better than using a simple loading spinner for images?

Accepted Answer

Blurhash provides a more visually appealing and content-aware placeholder that improves perceived performance by showing a blurred preview of the actual image. However, it requires additional processing and might be overkill for apps with simple image needs.

Question 3

How can I cache blurhash images to avoid re-decoding every time?

Accepted Answer

The library caches images based on blurhash properties, but cache clears on unmount. For persistent caching, you need to manage component lifecycle or implement custom solutions, as noted in the caching section.

Question 4

Does react-native-blurhash work with Expo?

Accepted Answer

It works with Expo Development Builds but not with Expo Go due to native code requirements. If you're using Expo Go, you'll need to switch to a development build or eject, as stated in the Expo compatibility notes.

Question 5

What are the best settings for decodeWidth and decodeHeight in a scrollable list?

Accepted Answer

For large lists, use 16 for both dimensions to maintain performance, as recommended in the README. For static images, increase to 32 for better quality without significant lag, but avoid higher values.

Question 6

How do I handle errors if a blurhash fails to decode?

Accepted Answer

Use the onLoadError callback in the Blurhash component to catch errors and provide a fallback, such as a default placeholder or retry mechanism, based on the error message parameter.

react-native-blurhash

What is react-native-blurhash?

Overview

Use Cases

Best For

Related Projects

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions