{"id":37607,"date":"2017-08-07T23:01:49","date_gmt":"2017-08-07T15:01:49","guid":{"rendered":"https:\/\/www.hongkiat.com\/blog\/?p=37607"},"modified":"2017-10-31T19:41:05","modified_gmt":"2017-10-31T11:41:05","slug":"rss-reader-in-javascript","status":"publish","type":"post","link":"https:\/\/www.hongkiat.com\/blog\/rss-reader-in-javascript\/","title":{"rendered":"How to Create a RSS Reader App in JavaScript"},"content":{"rendered":"

RSS (Really Simple Syndication)<\/strong> is a standardized format used by online publishers to syndicate their content<\/strong> to other websites and services. An RSS document<\/strong>, also known as a feed<\/strong>, is an XML document<\/strong> carrying the content that a publisher wishes to distribute.<\/p>\n

RSS feeds are available on almost all online news websites and blogs for their readers to stay up-to-date with their contents<\/strong>. They can also be found on non-text based websites<\/strong> such as YouTube, where you can use the feed of a YouTube channel to be informed of the latest videos<\/strong>.<\/p>\n

Read Also:<\/strong> How to Create RSS Feed Logo with CSS3<\/a><\/p>\n

Programs that access these feeds, and read and display their contents are called RSS readers<\/strong>. You can create a simple RSS reader program in JavaScript. In this tutorial, we\u2019ll see how to.<\/p>\n

\"RSS<\/figure>\n

Structure of an RSS feed<\/h2>\n

An RSS feed has a root element<\/strong> called <rss><\/code>, similar to the <html><\/code> tag found in HTML documents. Inside the <rss><\/code> tag, there is a <channel><\/code> element, kind of like <body><\/code> in HTML, that includes many sub-elements<\/strong> containing the distributed content of the website.<\/p>\n

A feed usually carries some basic information<\/strong> such as the title, URL, and description of the website and of the individual updated posts, articles, or other contents<\/strong> of that website. These information are found in <title><\/code>, <link><\/code>, and <description><\/code> elements, respectively.<\/p>\n

When these tags are directly present inside <channel><\/code><\/strong>, they hold the title, URL, and description of the website. When they\u2019re present inside <item><\/code><\/strong> that holds the information about the updated posts<\/strong>, they represent the same information as before but that of the individual contents that each <item><\/code> represent.<\/p>\n

There are also some optional elements<\/strong> that may be present in an RSS feed, providing supplementary information such as images or copyrights on the distributed content. You can learn about them in this RSS 2.0 specification<\/strong> at cyber.harvard.edu<\/a>.<\/p>\n

Here\u2019s a sample of how the RSS feed of a website<\/strong> might look like:<\/p>\n

\r\n<rss version=\"2.0\">\r\n  <channel>\r\n    <title>Hongkiat<\/title>\r\n    <link>https:\/\/www.hongkiat.com\/<\/link>\r\n    <description>Design Tips, Tutorial and Inspirations<\/description>\r\n    <language>en-us<\/language>\r\n    <item>\r\n    \t<title>Visualize Any CSS Stylesheet with CSS Stats<\/title>\r\n    \t<description>Ever wondered how many CSS rules\r\n      are in a stylesheet? Or have you ever\r\n      wanted to see\u2026<\/description>\r\n    \t<pubDate>18\/05\/2017<\/pubDate>\r\n    \t<link>https:\/\/www.hongkiat.com\/blog\/css-stylesheet-with-css-stats\/<\/link>\r\n    <\/item>\r\n    <item>\r\n    \t<title>Amazon Echo Show \u2013 The Latest Alexa-powered Smart Device<\/title>\r\n    \t<description>Amazon isn't stranger to the concept of smart home\r\n      systems with an embedded digital assistant.\r\n      After all, the\u2026<\/description>\r\n    \t<pubDate>17\/05\/2017<\/pubDate>\r\n    \t<link>https:\/\/www.hongkiat.com\/blog\/alexa-device-amazon-echo-show\/<\/link>\r\n    <\/item>\r\n  <\/channel>\r\n<\/rss>\r\n<\/pre>\n
Fetching the feed<\/h2>\n
We need to fetch the feed<\/strong> with our RSS reader application. On a website, the URL of an RSS feed can be found inside the <link><\/code> tag using the application\/rss+xml<\/code> type<\/strong>. For example, you\u2019ll find the following RSS feed link on Hongkiat.com.<\/p>\n
\r\n<link rel=\"alternate\" type=\"application\/rss+xml\"\r\ntitle=\"Hongkiat.com \u00bb Feed\"\r\nhref=\"https:\/\/www.hongkiat.com\/blog\/feed\/\">\r\n<\/pre>\n
First, let\u2019s see how to get the feed URL of a website<\/strong> using JavaScript.<\/p>\n
\r\nfetch(websiteUrl).then((res) => {\r\n  res.text().then((htmlTxt) => {\r\n    var domParser = new DOMParser()\r\n    let doc = domParser.parseFromString(htmlTxt, 'text\/html')\r\n    var feedUrl = doc.querySelector('link[type=\"application\/rss+xml\"]').href\r\n  })\r\n}).catch(() => console.error('Error in fetching the website'))\r\n<\/pre>\n
The fetch()<\/code><\/a><\/strong> method is a global method that asynchronously fetches a resource<\/strong>. It takes the URL of the resource as an argument (the URL of the website in our code). It returns a Promise<\/code><\/strong> object, so when the method successfully fetches the website (i.e. the Promise<\/code> is fulfilled), the first function inside the then()<\/code> statement handles the fetched response<\/strong> (res<\/code> in above code).<\/p>\n
Read Also:<\/strong> Getting Started with JavaScript Promises<\/a><\/p>\n
The fetched response is then fully read into a text string<\/strong> using the text()<\/code><\/a><\/strong> method. This text represents the HTML text of our fetched website<\/strong>. Like fetch()<\/code>, text()<\/code> also returns a Promise<\/code> object<\/strong>. So, when it successfully creates a response text from the response stream, then()<\/code> will handle that response text (htmlText<\/code> in above code).<\/p>\n
Once HTML text of the website is available, we use DOMParser API<\/code><\/a><\/strong> to parse it into a DOM document<\/strong>. DOMParser<\/code> parses an XML\/HTML text string into a DOM document. Its method, parseFromString()<\/code>, takes two arguments<\/strong>: the text to be parsed<\/strong> and the content type<\/strong>.<\/p>\n
Then, from the created DOM document, we find the href<\/code> value of the relevant <link><\/code> tag<\/strong> using the querySelector()<\/a><\/code> method in order to get the URL of the feed.<\/p>\n
Parsing and displaying the feed<\/h2>\n
Once we got the feed URL of the website, we need to fetch and read the RSS document<\/strong> found at that URL.<\/p>\n
\r\nfetch(feedUrl).then((res) => {\r\n  res.text().then((xmlTxt) => {\r\n    var domParser = new DOMParser()\r\n    let doc = domParser.parseFromString(xmlTxt, 'text\/xml')\r\n    doc.querySelectorAll('item').forEach((item) => {\r\n\t     let h1 = document.createElement('h1')\r\n\t      h1.textContent = item.querySelector('title').textContent\r\n\t       document.querySelector('output').appendChild(h1)\r\n       })\r\n     })\r\n})\r\n<\/pre>\n
In the same way as we fetched and parsed the website, now we get and parse the XML feed into a DOM document<\/strong>. To achieve this, we use the 'text\/xml'<\/code> content type in the parseFromString()<\/code> method.<\/p>\n
In the parsed document, we select all the <item><\/code> elements<\/strong> using the querySelectorAll<\/a><\/code> method and loop through each<\/strong>.<\/p>\n
Inside each element, we can access tags<\/strong> like <title><\/code>, <description><\/code>, and <link><\/code>, that are carrying the feed content. And, our simple RSS reader application is done, you can style the content of the fetched feeds as you desire.<\/p>\n
Github demo<\/h2>\n
You can check out the more detailed version<\/strong> of the code used in this post in our Github repo<\/a>. The more detailed version fetches three feeds<\/strong> (Mozilla Hacks<\/a>, Hongkiat, and the Webkit blog<\/a>) using a JSON file<\/strong> and also adds some CSS styles to the RSS reader.<\/p>","protected":false},"excerpt":{"rendered":"
RSS (Really Simple Syndication) is a standardized format used by online publishers to syndicate their content to other websites and services. An RSS document, also known as a feed, is an XML document carrying the content that a publisher wishes to distribute. RSS feeds are available on almost all online news websites and blogs for…<\/p>\n","protected":false},"author":145,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3392],"tags":[4117,432],"topic":[4520],"class_list":["entry-content","is-maxi"],"acf":[],"yoast_head":"\nHow to Create a RSS Reader App in JavaScript - Hongkiat<\/title>\n<meta name=\"description\" content=\"RSS (Really Simple Syndication) is a standardized format used by online publishers to syndicate their content to other websites and services. 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