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React.js inline style best practices

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When working with inline styles in React.js, there are some best practices to consider:

Use Inline Styles Sparingly

Inline styles can make our JSX code less readable and harder to maintain. Whenever possible, prefer using external CSS stylesheets or CSS-in-JS solutions like styled-components or Emotion.

Keep Styles Simple and Concise

Inline styles in React are written as JavaScript objects. Keep them simple and concise to maintain readability.

Use Object Spreading for Dynamic Styles

When applying dynamic styles, use object spreading to merge static and dynamic styles together.

const dynamicStyle = { color: "red" };
return <div style={{ ...staticStyle, ...dynamicStyle }}>Content</div>;    

Avoid Inline Styling for Global or Complex Styles

Inline styles are not suitable for global or complex styling requirements. Use CSS files or CSS-in-JS solutions for such cases.

Consider Performance

While inline styles can offer certain advantages like scoped styles and dynamic styling, be mindful of potential performance implications, especially when applying styles to large numbers of elements.

Prefer CSS Properties over Inline Styles

Whenever possible, use CSS properties that are supported by all major browsers. Inline styles might not always be fully supported or may behave differently across browsers.

Consider Accessibility

Ensure that our inline styles don’t hinder accessibility. For example, make sure there’s enough contrast between text and background colors for readability.


If we are using inline styles, consider testing our components to ensure that styles are applied correctly under different conditions.

Separation of Concerns

Keep our presentation logic separate from our business logic. Avoid mixing inline styles with business logic to maintain code readability and organization.

Consider CSS-in-JS Libraries

If we find ourselves needing to apply complex or dynamic styles frequently, consider using CSS-in-JS libraries like styled-components, Emotion, or CSS Modules. These libraries offer more powerful styling solutions while maintaining component-based styling approaches.

By following these best practices, we can effectively use inline styles in React.js while ensuring code readability, maintainability, and performance.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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