SVG Editor Edit SVG code with live preview, syntax highlighting, and instant rendering.

The tool utilizes React's useState and useEffect hooks to manage the state of the SVG code and preview. When the user types in the textarea, the code is updated and a debouncing mechanism with a 300ms timeout is triggered using setTimeout, preventing excessive re-renders of the preview container. The sanitized SVG markup is then injected into the preview container using dangerouslySetInnerHTML. Error handling is implemented to catch malformed SVG, checking if the code includes an <svg> element and displaying an error message if it doesn't. The Blob API is used to create a downloadable file with the SVG content when the download button is clicked.

The tool also uses the FileReader API to read uploaded SVG files, allowing users to import existing designs. The FileDropzone component handles file uploads, accepting .svg and image/svg+xml file types. When a file is dropped or selected, the handleFile function is called, reading the file content using a FileReader instance and updating the code state with the loaded text. The tool's templates are defined as an array of objects containing the template name and SVG code, which can be used as starting points for common design patterns like circles, rectangles, stars, and icons.

The useEffect hook is also used to clean up any pending timeouts when the component unmounts, preventing memory leaks. The timerRef is used to store the return value of setTimeout, allowing the timeout to be cleared when necessary. The use of React's useCallback hook ensures that functions like handleFile, download, and copyCode are only recreated when their dependencies change, optimizing performance by reducing unnecessary re-renders. The navigator.clipboard API is used to copy the SVG code to the clipboard when the copy button is clicked.