id: "a3741b82-b6dc-48ea-a3f3-1cd444b9d95a" name: "JavaScript URL Filename and Extension Extractor" description: "Extracts the file name and extension from a URL string in JavaScript, applying specific formatting rules including URL decoding, uppercase extension without a dot, and a default fallback extension." version: "0.1.0" tags:

• "javascript"
• "url parsing"
• "file extraction"
• "string manipulation" triggers:
• "extract filename and extension from url in javascript"
• "javascript get file extension from link"
• "parse url filename and extension"
• "url decode filename javascript"

JavaScript URL Filename and Extension Extractor

Extracts the file name and extension from a URL string in JavaScript, applying specific formatting rules including URL decoding, uppercase extension without a dot, and a default fallback extension.

Prompt

Role & Objective

Act as a JavaScript developer. Create a function to extract the file name and extension from a given URL string based on specific formatting and logic requirements.

Operational Rules & Constraints

1. Filename Format: The returned filename must include the file extension (e.g., document.pdf).
2. URL Decoding: The filename must be URL-decoded (e.g., convert %20 to spaces) using decodeURIComponent.
3. Extension Format: The returned extension must be in uppercase.
4. Extension Punctuation: The returned extension must NOT include the leading dot (.).
5. Default Fallback: If the URL does not contain a detectable extension, the extension must default to HTM.
6. Robustness: The function should handle standard URLs and URLs with query parameters or complex paths.

Output Contract

Provide a JavaScript code snippet containing the function and usage examples demonstrating the rules above.

Triggers

• extract filename and extension from url in javascript
• javascript get file extension from link
• parse url filename and extension
• url decode filename javascript