CSS to JSON Converter

Convert CSS to JSON online free. Turn stylesheet rules into JSON objects with camelCased properties, ready for React inline styles or a design token file.

CSS Input

JSON Output

{
  "body": {
    "font-family": "Arial, sans-serif",
    "margin": "0",
    "padding": "0",
    "background-color": "#ffffff"
  },
  "h1": {
    "color": "#333333",
    "font-weight": "bold"
  },
  "h2": {
    "color": "#333333",
    "font-weight": "bold"
  },
  ".container": {
    "max-width": "1200px",
    "margin": "0 auto",
    "padding": "0 16px"
  }
}

About the CSS to JSON Converter

This tool converts CSS to JSON, turning selectors into keys and declarations into objects with camelCased property names such as backgroundColor. That is exactly the shape React inline styles, styled-components theme objects and design token files all expect.

Convert CSS to JSON when styles have to become data. React inline styles need camelCased object keys, styled-components themes are plain objects, and design token pipelines consume JSON — but the source is usually an existing stylesheet.

Property names are camelCased during conversion, because that is the JavaScript convention: background-color becomes backgroundColor and font-size becomes fontSize. Selectors become object keys and each declaration block becomes the object beneath it, so the structure mirrors the stylesheet.

Useful when migrating a legacy stylesheet into a component library, or when extracting the colours and spacing from existing CSS to start a token file. Conversion happens in your browser, so unreleased design work is not uploaded anywhere.

How to use the CSS to JSON Converter

  1. Paste your CSS. Provide the stylesheet or the rules you want converted.
  2. Convert. Run the conversion. Property names are camelCased for JavaScript.
  3. Review the objects. Check that selectors became the keys you expect.
  4. Copy or download. Copy the JSON or save it as a .json file.

CSS to JSON Converter features

  • CSS to JSON conversion
  • JSON to CSS generation
  • CSS rules parsing
  • Structured JSON output
  • Bidirectional conversion
  • Syntax validation

Frequently asked questions

Why are property names camelCased?

Because JavaScript style objects require it. background-color becomes backgroundColor and font-size becomes fontSize.

How are selectors represented?

Each selector becomes a key in the JSON, with its declaration block as the object beneath it.

Can I use the output for React inline styles?

Yes. That is the main use case — the camelCased object shape is exactly what the style prop expects.

Are media queries handled?

They are preserved as their own keys containing the nested rules, so the structure is not lost.

Is my CSS uploaded?

No. Conversion runs entirely in your browser.