#102 · CSS Developer Tool

CSS Parser

Parse CSS into a simplified structural report containing selectors, declarations, at-rules, variables, media queries, and keyframes. Use the JSON output to inspect or document stylesheet structure.

Developer Input

Local browser processing
Ad space

How to use this developer tool

  1. Paste or type the source in the input area.
  2. Select the processing mode and adjust the optional value.
  3. Run the tool or leave auto-run enabled for immediate results.
  4. Review warnings and statistics before copying or downloading the output.

What this developer tool does

Parse CSS into a simplified structural report containing selectors, declarations, at-rules, variables, media queries, and keyframes. Use the JSON output to inspect or document stylesheet structure.

Input protection → structural scan → selected transformation or analysis → validation → copy-ready output and measured statistics.

Processing is performed locally. Advanced language edge cases may require a full standards-based parser or project-specific toolchain.

Example

Input:

:root { --primary: #8b5cf6; }
@media (max-width: 768px) {
  .card:hover { color: var(--primary); }
}
Output: Run the included example to see a real result generated by this tool.

Tips for better output

  • Test converted code in the target browser or runtime.
  • Keep an original copy before applying automated changes.
  • Large inputs are processed locally; disable auto-run when editing very large files.
  • Pattern-based analysis may not cover every language edge case.

FAQ

How do I parse CSS into JSON without a library?

Paste CSS and select JSON structure to receive a simplified rule, selector, declaration, and at-rule representation.

How can I extract all selectors from a CSS file?

Select Selector list to output unique selectors found in standard style rules.

How do I find CSS variables and their values?

The parser collects custom-property declarations beginning with two hyphens and reports their values.

How can I list every media query in CSS?

Media-query prelude text is extracted from @media blocks and included in the structural report.

How do I create a readable tree from CSS code?

Use JSON structure or readable summary, depending on whether the result is for code or manual review.

Supported analysis modules

ModulePurpose
StructureProtect strings and comments before scanning.
ProcessingApply the selected conversion, parser, validator, viewer, inspector, checker, or generator logic.
ReportingReturn output, status, measured size, lines, and practical notes.

Browse more developer tools

Calldeveloper category hub