jsdom

jsdom is a pure-JavaScript implementation of many web standards, notably the WHATWG DOM and HTML Standards, for use with Node.js. In general, the goal of the project is to emulate enough of a subset of a web browser to be useful for testing and scraping real-world web applications.

The latest versions of jsdom require Node.js v6 or newer. (Versions of jsdom below v10 still work with Node.js v4, but are unsupported.)

As of v10, jsdom has a new API (documented below). The old API is still supported for now; see its documentation for details.

Basic usage

const jsdom = require("jsdom");
const { JSDOM } = jsdom;

To use jsdom, you will primarily use the JSDOM constructor, which is a named export of the jsdom main module. Pass the constructor a string. You will get back a JSDOM object, which has a number of useful properties, notably window:

const dom = new JSDOM(`<!DOCTYPE html><p>Hello world</p>`);
console.log(dom.window.document.querySelector("p").textContent); // "Hello world"

(Note that jsdom will parse the HTML you pass it just like a browser does, including implied <html>, <head>, and <body> tags.)

The resulting object is an instance of the JSDOM class, which contains a number of useful properties and methods besides window. In general it can be used to act on the jsdom from the "outside," doing things that are not possible with the normal DOM APIs. For simple cases, where you don't need any of this functionality, we recommend a coding pattern like

const { window } = new JSDOM(`...`);
// or even
const { document } = (new JSDOM(`...`)).window;

Full documentation on everything you can do with the JSDOM class is below, in the section "JSDOM Object API".

Customizing jsdom

The JSDOM constructor accepts a second parameter which can be used to customize your jsdom in the following ways.

Simple options

const dom = new JSDOM(``, {
  url: "https://example.org/",
  referrer: "https://example.com/",
  contentType: "text/html",
  userAgent: "Mellblomenator/9000",
  includeNodeLocations: true
});

url sets the value returned by window.location, document.URL, and document.documentURI, and affects things like resolution of relative URLs within the document and the same-origin restrictions and referrer used while fetching subresources. It defaults to "about:blank".
referrer just affects the value read from document.referrer. It defaults to no referrer (which reflects as the empty string).
contentType affects the value read from document.contentType, and how the document is parsed: as HTML or as XML. Values that are not "text/html" or an XML mime type will throw. It defaults to "text/html".
userAgent affects the value read from navigator.userAgent, as well as the User-Agent header sent while fetching subresources. It defaults to `Mozilla/5.0 (${process.platform}) AppleWebKit/537.36 (KHTML, like Gecko) jsdom/${jsdomVersion}`.
includeNodeLocations preserves the location info produced by the HTML parser, allowing you to retrieve it with the nodeLocation() method (described below). It also ensures that line numbers reported in exception stack traces for code running inside <script> elements are correct. It defaults to false to give the best performance, and cannot be used with an XML content type since our XML parser does not support location info.

Note that both url and referrer are canonicalized before they're used, so e.g. if you pass in "https:example.com", jsdom will interpret that as if you had given "https://example.com/". If you pass an unparseable URL, the call will throw. (URLs are parsed and serialized according to the URL Standard.)

Executing scripts

jsdom's most powerful ability is that it can execute scripts inside the jsdom. These scripts can modify the content of the page and access all the web platform APIs jsdom implements.

However, this is also highly dangerous when dealing with untrusted content. The jsdom sandbox is not foolproof, and code running inside the DOM's <script>s can, if it tries hard enough, get access to the Node.js environment, and thus to your machine. As such, the ability to execute scripts embedded in the HTML is disabled by default:

const dom = new JSDOM(`<body>
  <script>document.body.appendChild(document.createElement("hr"));</script>
</body>`);

// The script will not be executed, by default:
dom.window.document.body.children.length === 1;

To enable executing scripts inside the page, you can use the runScripts: "dangerously" option:

const dom = new JSDOM(`<body>
  <script>document.body.appendChild(document.createElement("hr"));</script>
</body>`, { runScripts: "dangerously" });

// The script will be executed and modify the DOM:
dom.window.document.body.children.length === 2;

Again we emphasize to only use this when feeding jsdom code you know is safe. If you use it on arbitrary user-supplied code, or code from the Internet, you are effectively running untrusted Node.js code, and your machine could be compromised.

Note that event handler attributes, like <div onclick="">, will also not function unless runScripts is set to "dangerously". (However, event handler properties, like div.onclick = ..., will function regardless of runScripts.)

If you are simply trying to execute script "from the outside", instead of letting <script> elements (and inline event handlers) run "from the inside", you can use the runScripts: "outside-only" option, which enables window.eval:

const window = (new JSDOM(``, { runScripts: "outside-only" })).window;

window.eval(`document.body.innerHTML = "<p>Hello, world!</p>";`);
window.document.body.children.length === 1;

This is turned off by default for performance reasons, but is safe to enable.

Note that we strongly advise against trying to "execute scripts" by mashing together the jsdom and Node global environments (e.g. by doing global.window = dom.window), and then executing scripts or test code inside the Node global environment. Instead, you should treat jsdom like you would a browser, and run all scripts and tests that need access to a DOM inside the jsdom environment, using window.eval or runScripts: "dangerously". This might require, for example, creating a browserify bundle to execute as a <script> element—just like you would in a browser.

Finally, for advanced use cases you can use the dom.runVMScript(script) method, documented below.

Pretending to be a visual browser

jsdom does not have the capability to render visual content, and will act like a headless browser by default. It provides hints to web pages through APIs such as document.hidden that their content is not visible.

When the pretendToBeVisual option is set to true, jsdom will pretend that it is rendering and displaying content. It does this by:

Changing document.hidden to return true instead of false
Changing document.visibilityState to return "visible" instead of "prerender"
Enabling window.requestAnimationFrame() and window.cancelAnimationFrame() methods, which otherwise do not exist

const window = (new JSDOM(``, { pretendToBeVisual: true })).window;

window.requestAnimationFrame(timestamp => {
  console.log(timestamp > 0);
});

Note that jsdom still does not do any layout or rendering, so this is really just about pretending to be visual, not about implementing the parts of the platform a real, visual web browser would implement.

Loading subresources

By default, jsdom will not load any subresources such as scripts, stylesheets, images, or iframes. If you'd like jsdom to load such resources, you can pass the resources: "usable" option, which will load all usable resources. Those are:

Frames and iframes, via <frame> and <iframe>
Stylesheets, via <link rel="stylesheet">
Scripts, via <script>, but only if runScripts: "dangerously" is also set
Images, via <img>, but only if the canvas (or canvas-prebuilt) npm package is also installed (see "Canvas Support" below)

In the future we plan to offer more customization of resource loading via this option, but for now the default and the "usable" option are the two modes offered.

Virtual consoles

Like web browsers, jsdom has the concept of a "console". This records both information directly sent from the page, via scripts executing inside the document, as well as information from the jsdom implementation itself. We call the user-controllable console a "virtual console", to distinguish it from the Node.js console API and from the inside-the-page window.console API.

By default, the JSDOM constructor will return an instance with a virtual console that forwards all its output to the Node.js console. To create your own virtual console and pass it to jsdom, you can override this default by doing

const virtualConsole = new jsdom.VirtualConsole();
const dom = new JSDOM(``, { virtualConsole });

Code like this will create a virtual console with no behavior. You can give it behavior by adding event listeners for all the possible console methods:

virtualConsole.on("error", () => { ... });
virtualConsole.on("warn", () => { ... });
virtualConsole.on("info", () => { ... });
virtualConsole.on("dir", () => { ... });
// ... etc. See https://console.spec.whatwg.org/#logging

(Note that it is probably best to set up these event listeners before calling new JSDOM(), since errors or console-invoking script might occur during parsing.)

If you simply want to redirect the virtual console output to another console, like the default Node.js one, you can do

virtualConsole.sendTo(console);

There is also a special event, "jsdomError", which will fire with error objects to report errors from jsdom itself. This is similar to how error messages often show up in web browser consoles, even if they are not initiated by console.error. So far, the following errors are output this way:

Errors loading or parsing subresources (scripts, stylesheets, frames, and iframes)
Script execution errors that are not handled by a window onerror event handler that returns true or calls event.preventDefault()
Not-implemented errors resulting from calls to methods, like window.alert, which jsdom does not implement, but installs anyway for web compatibility

If you're using sendTo(c) to send errors to c, by default it will call console.error with information from "jsdomError" events. If you'd prefer to maintain a strict one-to-one mapping of events to method calls, and perhaps handle "jsdomError"s yourself, then you can do

virtualConsole.sendTo(c, { omitJSDOMErrors: true });

Cookie jars

Like web browsers, jsdom has the concept of a cookie jar, storing HTTP cookies. Cookies that have a URL on the same domain as the document, and are not marked HTTP-only, are accessible via the document.cookie API. Additionally, all cookies in the cookie jar will impact the fetching of subresources.

By default, the JSDOM constructor will return an instance with an empty cookie jar. To create your own cookie jar and pass it to jsdom, you can override this default by doing

const cookieJar = new jsdom.CookieJar(store, options);
const dom = new JSDOM(``, { cookieJar });

This is mostly useful if you want to share the same cookie jar among multiple jsdoms, or prime the cookie jar with certain values ahead of time.

Cookie jars are provided by the tough-cookie package. The jsdom.CookieJar constructor is a subclass of the tough-cookie cookie jar which by default sets the looseMode: true option, since that matches better how browsers behave. If you want to use tough-cookie's utilities and classes yourself, you can use the jsdom.toughCookie module export to get access to the tough-cookie module instance packaged with jsdom.

Intervening before parsing

jsdom allows you to intervene in the creation of a jsdom very early: after the Window and Document objects are created, but before any HTML is parsed to populate the document with nodes:

const dom = new JSDOM(`<p>Hello</p>`, {
  beforeParse(window) {
    window.document.childNodes.length === 0;
    window.someCoolAPI = () => { /* ... */ };
  }
});

This is especially useful if you are wanting to modify the environment in some way, for example adding shims for web platform APIs jsdom does not support.

`JSDOM` object API

Once you have constructed a JSDOM object, it will have the following useful capabilities:

Properties

The property window retrieves the Window object that was created for you.

The properties virtualConsole and cookieJar reflect the options you pass in, or the defaults created for you if nothing was passed in for those options.

Serializing the document with `serialize()`

The serialize() method will return the HTML serialization of the document, including the doctype:

const dom = new JSDOM(`<!DOCTYPE html>hello`);

dom.serialize() === "<!DOCTYPE html><html><head></head><body>hello</body></html>";

// Contrast with:
dom.window.document.documentElement.outerHTML === "<html><head></head><body>hello</body></html>";

Getting the source location of a node with `nodeLocation(node)`

The nodeLocation() method will find where a DOM node is within the source document, returning the parse5 location info for the node:

const dom = new JSDOM(
  `<p>Hello
    <img src="foo.jpg">
  </p>`,
  { includeNodeLocations: true }
);

const document = dom.window.document;
const bodyEl = document.body; // implicitly created
const pEl = document.querySelector("p");
const textNode = pEl.firstChild;
const imgEl = document.querySelector("img");

console.log(dom.nodeLocation(bodyEl));   // null; it's not in the source
console.log(dom.nodeLocation(pEl));      // { startOffset: 0, endOffset: 39, startTag: ..., endTag: ... }
console.log(dom.nodeLocation(textNode)); // { startOffset: 3, endOffset: 13 }
console.log(dom.nodeLocation(imgEl));    // { startOffset: 13, endOffset: 32 }

Note that this feature only works if you have set the includeNodeLocations option; node locations are off by default for performance reasons.

Running vm-created scripts with `runVMScript(script)`

The built-in vm module of Node.js allows you to create Script instances, which can be compiled ahead of time and then run multiple times on a given "VM context". Behind the scenes, a jsdom Window is indeed a VM context. To get access to this ability, use the runVMScript() method:

const { Script } = require("vm");

const dom = new JSDOM(``, { runScripts: "outside-only" });
const s = new Script(`
  if (!this.ran) {
    this.ran = 0;
  }

  ++this.ran;
`);

dom.runVMScript(s);
dom.runVMScript(s);
dom.runVMScript(s);

dom.window.ran === 3;

This is somewhat-advanced functionality, and we advise sticking to normal DOM APIs (such as window.eval() or document.createElement("script")) unless you have very specific needs.

Reconfiguring the jsdom with `reconfigure(settings)`

The top property on window is marked [Unforgeable] in the spec, meaning it is a non-configurable own property and thus cannot be overridden or shadowed by normal code running inside the jsdom, even using Object.defineProperty.

Similarly, at present jsdom does not handle navigation (such as setting window.location.href = "https://example.com/"); doing so will cause the virtual console to emit a "jsdomError" explaining that this feature is not implemented, and nothing will change: there will be no new Window or Document object, and the existing window's location object will still have all the same property values.

However, if you're acting from outside the window, e.g. in some test framework that creates jsdoms, you can override one or both of these using the special reconfigure() method:

const dom = new JSDOM();

dom.window.top === dom.window;
dom.window.location.href === "about:blank";

dom.reconfigure({ windowTop: myFakeTopForTesting, url: "https://example.com/" });

dom.window.top === myFakeTopForTesting;
dom.window.location.href === "https://example.com/";

Note that changing the jsdom's URL will impact all APIs that return the current document URL, such as window.location, document.URL, and document.documentURI, as well as resolution of relative URLs within the document, and the same-origin checks and referrer used while fetching subresources. It will not, however, perform a navigation to the contents of that URL; the contents of the DOM will remain unchanged, and no new instances of Window, Document, etc. will be created.

Convenience APIs

`fromURL()`

In addition to the JSDOM constructor itself, jsdom provides a promise-returning factory method for constructing a jsdom from a URL:

JSDOM.fromURL("https://example.com/", options).then(dom => {
  console.log(dom.serialize());
});

The returned promise will fulfill with a JSDOM instance if the URL is valid and the request is successful. Any redirects will be followed to their ultimate destination.

The options provided to fromURL() are similar to those provided to the JSDOM constructor, with the following additional restrictions and consequences:

The url and contentType options cannot be provided.
The referrer option is used as the HTTP Referer request header of the initial request.
The userAgent option is used as the HTTP User-Agent request header of any requests.
The resulting jsdom's URL, content type, and referrer are determined from the response.
Any cookies set via HTTP Set-Cookie response headers are stored in the jsdom's cookie jar. Similarly, any cookies already in a supplied cookie jar are sent as HTTP Cookie request headers.

The initial request is not infinitely customizable to the same extent as is possible in a package like request; fromURL() is meant to be a convenience API for the majority of cases. If you need greater control over the initial request, you should perform it yourself, and then use the JSDOM constructor manually.

`fromFile()`

Similar to fromURL(), jsdom also provides a fromFile() factory method for constructing a jsdom from a filename:

JSDOM.fromFile("stuff.html", options).then(dom => {
  console.log(dom.serialize());
});

The returned promise will fulfill with a JSDOM instance if the given file can be opened. As usual in Node.js APIs, the filename is given relative to the current working directory.

The options provided to fromFile() are similar to those provided to the JSDOM constructor, with the following additional defaults:

The url option will default to a file URL corresponding to the given filename, instead of to "about:blank".
The contentType option will default to "application/xhtml+xml" if the given filename ends in .xhtml or .xml; otherwise it will continue to default to "text/html".

`fragment()`

For the very simplest of cases, you might not need a whole JSDOM instance with all its associated power. You might not even need a Window or Document! Instead, you just need to parse some HTML, and get a DOM object you can manipulate. For that, we have fragment(), which creates a DocumentFragment from a given string:

const frag = JSDOM.fragment(`<p>Hello</p><p><strong>Hi!</strong>`);

frag.childNodes.length === 2;
frag.querySelector("strong").textContent = "Why hello there!";
// etc.

Here frag is a DocumentFragment instance, whose contents are created by parsing the provided string. The parsing is done using a <template> element, so you can include any element there (including ones with weird parsing rules like <td>).

All invocations of the framgment() factory result in DocumentFragments that share the same owner Document and Window. This allows many calls to fragment() with no extra overhead. But it also means that calls to fragment() cannot be customized with any options.

Note that serialization is not as easy with DocumentFragments as it is with full JSDOM objects. If you need to serialize your DOM, you should probably use the JSDOM constructor more directly. But for the special case of a fragment containing a single element, it's pretty easy to do through normal means:

const frag = JSDOM.fragment(`<p>Hello</p>`);
console.log(frag.firstChild.outerHTML); // logs "<p>Hello</p>"

Other noteworthy features

Canvas support

jsdom includes support for using the canvas or canvas-prebuilt package to extend any <canvas> elements with the canvas API. To make this work, you need to include canvas as a dependency in your project, as a peer of jsdom. If jsdom can find the canvas package, it will use it, but if it's not present, then <canvas> elements will behave like <div>s.

Encoding sniffing

In addition to supplying a string, the JSDOM constructor can also be supplied binary data, in the form of a Node.js Buffer or a standard JavaScript binary data type like ArrayBuffer, Uint8Array, DataView, etc. When this is done, jsdom will sniff the encoding from the supplied bytes, scanning for <meta charset> tags just like a browser does.

This encoding sniffing also applies to JSDOM.fromFile() and JSDOM.fromURL(). In the latter case, just as in a browser, any Content-Type headers sent with the response will take priority.

Note that in many cases supplying bytes in this fashion can be better than supplying a string. For example, if you attempt to use Node.js's buffer.toString("utf-8") API, Node.js will not strip any leading BOMs. If you then give this string to jsdom, it will interpret it verbatim, leaving the BOM intact. But jsdom's binary data decoding code will strip leading BOMs, just like a browser; in such cases, supplying buffer directly will give the desired result.

Closing down a jsdom

Timers in the jsdom (set by window.setTimeout() or window.setInterval()) will, by definition, execute code in the future in the context of the window. Since there is no way to execute code in the future without keeping the process alive, outstanding jsdom timers will keep your Node.js process alive. Similarly, since there is no way to execute code in the context of an object without keeping that object alive, outstanding jsdom timers will prevent garbage collection of the window on which they are scheduled.

If you want to be sure to shut down a jsdom window, use window.close(), which will terminate all running timers (and also remove any event listeners on the window and document).

Running jsdom inside a web browser

jsdom has some support for being run inside a web browser, using browserify. That is, inside a web browser, you can use a browserified jsdom to create an entirely self-contained set of plain JavaScript objects which look and act much like the browser's existing DOM objects, while being entirely independent of them. "Virtual DOM", indeed!

jsdom's primary target is still Node.js, and so we use language features that are only present in recent Node.js versions (namely, Node.js v6+). Thus, older browsers will likely not work. (Even transpilation will not help much: we plan to use Proxys extensively throughout the course of jsdom v10.x.)

Notably, jsdom works well inside a web worker. The original contributor, @lawnsea, who made this possible, has published a paper about his project which uses this capability.

Not everything works perfectly when running jsdom inside a web browser. Sometimes that is because of fundamental limitations (such as not having filesystem access), but sometimes it is simply because we haven't spent enough time making the appropriate small tweaks. Bug reports are certainly welcome.

Caveats

Asynchronous script loading

People often have trouble with asynchronous script loading when using jsdom. Many pages loads scripts asynchronously, but there is no way to tell when they're done doing so, and thus when it's a good time to run your code and inspect the resulting DOM structure. This is a fundamental limitation; we cannot predict what scripts on the web page will do, and so cannot tell you when they are done loading more scripts.

This can be worked around in a few ways. The best way, if you control the page in question, is to use whatever mechanisms are given by the script loader to detect when loading is done. For example, if you're using a module loader like RequireJS, the code could look like:

// On the Node.js side:
const window = (new JSDOM(...)).window;
window.onModulesLoaded = () => {
  console.log("ready to roll!");
};

<!-- Inside the HTML you supply to jsdom -->
<script>
requirejs(["entry-module"], () => {
  window.onModulesLoaded();
});
</script>

If you do not control the page, you could try workarounds such as polling for the presence of a specific element.

For more details, see the discussion in #640, especially @matthewkastor's insightful comment.

Shared constructors and prototypes

At the present time, for most web platform APIs, jsdom shares the same class definition between multiple seemingly-independent jsdoms. That means that, for example, the following situation can occur:

const dom1 = new JSDOM();
const dom2 = new JSDOM();

dom1.window.Element.prototype.expando = "blah";
console.log(dom2.window.document.createElement("frameset").expando); // logs "blah"

This is done mainly for performance and memory reasons: creating separate copies of all the many classes on the web platform, each time we create a jsdom, would be rather expensive.

Nevertheless, we remain interested in one day providing an option to create an "independent" jsdom, at the cost of some performance.

Missing features in the new API

Compared to the old jsdom API from v9.x and before, the new API is noticeably missing fine-grained control of resource loads. Previous versions of jsdom allowed you to set options that were used when making requests (both for the initial request, in the old equivalent of JSDOM.fromURL(), and for subresource requests). They also allowed you to control which subresources were requested and applied to the main document, so that you could e.g. download stylesheets but not scripts. Finally, they provided a customizable resource loader that let you intercept any outgoing request and fulfill it with a completely synthetic response.

None of these features are yet in the new jsdom API, although we are hoping to add them back soon! This requires a decent amount of behind-the-scenes work to implement in a reasonable way, unfortunately.

In the meantime, please feel free to use the old jsdom API to get access to this functionality. It is supported and maintained, although it will not be getting new features. The documentation is found in lib/old-api.md.

Unimplemented parts of the web platform

Although we enjoy adding new features to jsdom and keeping it up to date with the latest web specs, it has many missing APIs. Please feel free to file an issue for anything missing, but we're a small and busy team, so a pull request might work even better.

Beyond just features that we haven't gotten to yet, there are two major features that are currently outside the scope of jsdom. These are:

Navigation: the ability to change the global object, and all other objects, when clicking a link or assigning location.href or similar.
Layout: the ability to calculate where elements will be visually laid out as a result of CSS, which impacts methods like getBoundingClientRects() or properties like offsetTop.

Currently jsdom has dummy behaviors for some aspects of these features, such as sending a "not implemented" "jsdomError" to the virtual console for navigation, or returning zeros for many layout-related properties. Often you can work around these limitations in your code, e.g. by creating new JSDOM instances for each page you "navigate" to during a crawl, or using Object.defineProperty() to change what various layout-related getters and methods return.

Note that other tools in the same space, such as PhantomJS, do support these features. On the wiki, we have a more complete writeup about jsdom vs. PhantomJS.

Getting help

If you need help with jsdom, please feel free to use any of the following venues:

The mailing list (best for "how do I" questions)
The issue tracker (best for bug reports)
The IRC channel: #jsdom on freenode

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jsdom

Basic usage

Customizing jsdom

Simple options

Executing scripts

Pretending to be a visual browser

Loading subresources

Virtual consoles

Cookie jars

Intervening before parsing

`JSDOM` object API

Properties

Serializing the document with `serialize()`

Getting the source location of a node with `nodeLocation(node)`

Running vm-created scripts with `runVMScript(script)`

Reconfiguring the jsdom with `reconfigure(settings)`

Convenience APIs

`fromURL()`

`fromFile()`

`fragment()`

Other noteworthy features

Canvas support

Encoding sniffing

Closing down a jsdom

Running jsdom inside a web browser

Caveats

Asynchronous script loading

Shared constructors and prototypes

Missing features in the new API

Unimplemented parts of the web platform

Getting help

About

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holvonixAdvay/jsdom

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Repository files navigation

jsdom

Basic usage

Customizing jsdom

Simple options

Executing scripts

Pretending to be a visual browser

Loading subresources

Virtual consoles

Cookie jars

Intervening before parsing

JSDOM object API

Properties

Serializing the document with serialize()

Getting the source location of a node with nodeLocation(node)

Running vm-created scripts with runVMScript(script)

Reconfiguring the jsdom with reconfigure(settings)

Convenience APIs

fromURL()

fromFile()

fragment()

Other noteworthy features

Canvas support

Encoding sniffing

Closing down a jsdom

Running jsdom inside a web browser

Caveats

Asynchronous script loading

Shared constructors and prototypes

Missing features in the new API

Unimplemented parts of the web platform

Getting help

About

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`JSDOM` object API

Serializing the document with `serialize()`

Getting the source location of a node with `nodeLocation(node)`

Running vm-created scripts with `runVMScript(script)`

Reconfiguring the jsdom with `reconfigure(settings)`

`fromURL()`

`fromFile()`

`fragment()`

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