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Conversor de CSS para Objeto de Estilo JavaScript

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Conversor de CSS para Objeto de Estilo JavaScript

The CSS to JavaScript Style Object Converter transforms CSS declarations into JavaScript style objects and back. Whether you’re working with React inline styles, React Native StyleSheets, or CSS-in-JS libraries like styled-components and Emotion, this tool handles the conversion instantly — no more manual camelCase rewriting.

Como usar

Paste your CSS declarations into the input panel. Select your desired output format — React inline style, React Native StyleSheet, or styled-components template literal. The converter processes each property in real time: hyphenated names become camelCase, values are properly quoted or kept as numbers, and vendor prefixes are handled correctly. You can also convert in reverse by toggling to JS → CSS mode. Click the Copy button to grab the output.

Características

Conversão bidirecional – Convert CSS to JS style objects or JS objects back to CSS with a single toggle
Vários formatos de saída – Support for React inline styles, React Native StyleSheet, and styled-components/Emotion template literals
Smart camelCase – Correctly converts hyphenated CSS properties (background-color → backgroundColor)
Tratamento de Prefixos de Fornecedor – Properly transforms -webkit-, -moz-, -ms- prefixed properties (e.g., -webkit-transform → WebkitTransform)
Numeric Value Detection – Keeps pure numbers as numbers (margin: 0 stays 0, not “0”) while quoting string values
React Native Optimized – Strips px units and converts to numbers when targeting React Native
Processamento em tempo real – Conversion happens instantly as you type
Cópia com Um Clique – Copy the converted output to your clipboard

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 Perguntas frequentes

Why do CSS properties need to be camelCase in JavaScript?

JavaScript object keys cannot contain hyphens unless quoted. Since CSS properties like background-color and font-size use hyphens, they must be converted to camelCase (backgroundColor, fontSize) to work as unquoted object keys. This is a requirement of the JavaScript language specification, not a framework convention.
What is the difference between inline styles and CSS-in-JS?

Inline styles are JavaScript objects passed directly to a component's style prop. They support only a subset of CSS (no pseudo-classes, media queries, or animations). CSS-in-JS libraries like styled-components and Emotion generate actual CSS at runtime or build time, supporting the full CSS specification including pseudo-classes, keyframes, and media queries while still being authored in JavaScript.
How does React Native handle CSS units differently?

React Native uses unitless numbers for dimensions — writing width: 100 means 100 density-independent pixels. It does not support CSS units like px, em, rem, or vh. Percentage values are supported for some properties using strings (e.g., width: '50%'). This is because React Native renders to native views, not a browser DOM, so web-specific units have no meaning.
How are vendor prefixes handled in JavaScript style objects?

In JavaScript style objects, vendor-prefixed CSS properties follow a specific capitalization pattern. The prefix loses its leading hyphen and gets capitalized: -webkit-transform becomes WebkitTransform, -moz-appearance becomes MozAppearance. React and other frameworks use this convention to apply the correct vendor-specific styles in the rendered output.