JSFiddle

Make a focused browser example

Start with an empty fiddle or a boilerplate, then put structure, styles, and behavior in their respective panels. JSFiddle supplies the surrounding document structure, so the HTML panel can focus on the fragment being demonstrated. Choose a CSS preprocessor such as SCSS or a supported JavaScript framework when the example needs it, then use Run to refresh the result panel.

For example, a developer investigating a spacing issue could reduce a page to a heading, one button, and the few CSS rules that affect it. That smaller reproduction is easier to discuss than an entire application. The example is illustrative; no code was entered or run for this listing. External CSS or JavaScript can be added by URL, and the documentation also describes selecting libraries from CDNJS.

Share the runnable result

Save or update a fiddle to retain a version, or fork another person's fiddle as a separate starting point. The embed options let the author choose which panels appear and whether the snippet uses a light or dark visual treatment. This makes JSFiddle useful for a bug report, tutorial, or library example where readers should see both code and output. The docs say that adding a title places a fiddle on the public profile; an untitled fiddle is unlisted, but anyone with its direct link can still open it. That is not a private-code setting.

JSFiddle's homepage presents a free core experience and a paid PRO tier. PRO includes private fiddles and collections, among other extras; check that distinction before putting code that must remain private into a free workflow. The public documentation says setting a saved version as the base version requires login, but the pages reviewed do not establish every account requirement for creating, saving, or sharing a fiddle.