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URLs are versatile but easy to generate incorrectly, especially when combined from various sources. Fortunately, there are libraries that not only build URLs from their separate parts - scheme, domain, etc. - but also parse and clean badly-formatted ones. Take this example, with extra forward slashes and an unnecessary WWW subdomain:
const normalizeUrl = require("normalize-url")
const fixedUrl = normalizeUrl("https://www.duckduckgo.com//?q=meme&t=h_&df=d")
"https://duckduckgo.com/?df=d&q=meme&t=h_" === fixedUrl
Note that normalize-url also orders the parameters, which can make them a little easier to understand.
fixedUrl
You can call the endpoint of this RunKit with an encoded URL parameter to test this library. Open Developer Tools and run `copy(encodeURIComponent("https://www.duckduckgo.com//?q=meme&t=h_&df=d"))`, then paste into the URL in the form `<RunKitURL>?url=<paste>`.
const url = require("url")
exports.endpoint = (request, response) => {
const query = url.parse(request.url, true).query
const queryUrl = decodeURIComponent(query.url)
const normalizedUrl = normalizeUrl(queryUrl)
response.setHeader("Content-Type", "text/plain")
response.end(normalizedUrl)
}
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