goquery brings a syntax and a set of features similar to jQuery to the Go language. It is based on Go's net/html package and the CSS Selector library cascadia. Since the net/html parser returns nodes, and not a full-featured DOM tree, jQuery's stateful manipulation functions (like height(), css(), detach()) have been left off.
Also, because the net/html parser requires UTF-8 encoding, so does goquery: it is the caller's responsibility to ensure that the source document provides UTF-8 encoded HTML. See the wiki for various options to do this.
Syntax-wise, it is as close as possible to jQuery, with the same function names when possible, and that warm and fuzzy chainable interface. jQuery being the ultra-popular library that it is, I felt that writing a similar HTML-manipulating library was better to follow its API than to start anew (in the same spirit as Go's fmt package), even though some of its methods are less than intuitive (looking at you, index()...).
Required Go version:
- Starting with version
v1.10.0of goquery, Go 1.23+ is required due to the use of function-based iterators. - For
v1.9.0of goquery, Go 1.18+ is required due to the use of generics. - For previous goquery versions, a Go version of 1.1+ was required because of the
net/htmldependency.
Ongoing goquery development is tested on the latest 2 versions of Go.
$ go get github.com/PuerkitoBio/goquery
(optional) To run unit tests:
$ cd $GOPATH/src/github.com/PuerkitoBio/goquery
$ go test
(optional) To run benchmarks (warning: it runs for a few minutes):
$ cd $GOPATH/src/github.com/PuerkitoBio/goquery
$ go test -bench=".*"
Note that goquery's API is now stable, and will not break.
- 2024-09-06 (v1.10.0) : Add
EachIterwhich provides an iterator that can be used infor..rangeloops on the*Selectionobject. goquery now requires Go version 1.23+ (thanks @amikai). - 2024-09-06 (v1.9.3) : Update
go.moddependencies. - 2024-04-29 (v1.9.2) : Update
go.moddependencies. - 2024-02-29 (v1.9.1) : Improve allocation and performance of the
Mapfunction andSelection.Mapmethod, better document the cascadia differences (thanks @jwilsson). - 2024-02-22 (v1.9.0) : Add a generic
Mapfunction, goquery now requires Go version 1.18+ (thanks @Fesaa). - 2023-02-18 (v1.8.1) : Update
go.moddependencies, update CI workflow. - 2021-10-25 (v1.8.0) : Add
Renderfunction to render aSelectionto anio.Writer(thanks @anthonygedeon). - 2021-07-11 (v1.7.1) : Update go.mod dependencies and add dependabot config (thanks @jauderho).
- 2021-06-14 (v1.7.0) : Add
SingleandSingleMatcherfunctions to optimize first-match selection (thanks @gdollardollar). - 2021-01-11 (v1.6.1) : Fix panic when calling
{Prepend,Append,Set}Htmlon aSelectionthat contains non-Element nodes. - 2020-10-08 (v1.6.0) : Parse html in context of the container node for all functions that deal with html strings (
AfterHtml,AppendHtml, etc.). Thanks to @thiemok and @davidjwilkins for their work on this. - 2020-02-04 (v1.5.1) : Update module dependencies.
- 2018-11-15 (v1.5.0) : Go module support (thanks @Zaba505).
- 2018-06-07 (v1.4.1) : Add
NewDocumentFromReaderexamples. - 2018-03-24 (v1.4.0) : Deprecate
NewDocument(url)andNewDocumentFromResponse(response). - 2018-01-28 (v1.3.0) : Add
ToEndconstant toSliceuntil the end of the selection (thanks to @davidjwilkins for raising the issue). - 2018-01-11 (v1.2.0) : Add
AddBack*and deprecateAndSelf(thanks to @davidjwilkins). - 2017-02-12 (v1.1.0) : Add
SetHtmlandSetText(thanks to @glebtv). - 2016-12-29 (v1.0.2) : Optimize allocations for
Selection.Text(thanks to @radovskyb). - 2016-08-28 (v1.0.1) : Optimize performance for large documents.
- 2016-07-27 (v1.0.0) : Tag version 1.0.0.
- 2016-06-15 : Invalid selector strings internally compile to a
Matcherimplementation that never matches any node (instead of a panic). So for example,doc.Find("~")returns an empty*Selectionobject. - 2016-02-02 : Add
NodeNameutility function similar to the DOM'snodeNameproperty. It returns the tag name of the first element in a selection, and other relevant values of non-element nodes (see doc for details). AddOuterHtmlutility function similar to the DOM'souterHTMLproperty (namedOuterHtmlin small caps for consistency with the existingHtmlmethod on theSelection). - 2015-04-20 : Add
AttrOrhelper method to return the attribute's value or a default value if absent. Thanks to piotrkowalczuk. - 2015-02-04 : Add more manipulation functions - Prepend* - thanks again to Andrew Stone.
- 2014-11-28 : Add more manipulation functions - ReplaceWith*, Wrap* and Unwrap - thanks again to Andrew Stone.
- 2014-11-07 : Add manipulation functions (thanks to Andrew Stone) and
*Matcherfunctions, that receive compiled cascadia selectors instead of selector strings, thus avoiding potential panics thrown by goquery viacascadia.MustCompilecalls. This results in better performance (selectors can be compiled once and reused) and more idiomatic error handling (you can handle cascadia's compilation errors, instead of recovering from panics, which had been bugging me for a long time). Note that the actual type expected is aMatcherinterface, thatcascadia.Selectorimplements. Other matcher implementations could be used. - 2014-11-06 : Change import paths of net/html to golang.org/x/net/html (see https://groups.google.com/forum/#!topic/golang-nuts/eD8dh3T9yyA). Make sure to update your code to use the new import path too when you call goquery with
html.Nodes. - v0.3.2 : Add
NewDocumentFromReader()(thanks jweir) which allows creating a goquery document from an io.Reader. - v0.3.1 : Add
NewDocumentFromResponse()(thanks assassingj) which allows creating a goquery document from an http response. - v0.3.0 : Add
EachWithBreak()which allows to break out of anEach()loop by returning false. This function was added instead of changing the existingEach()to avoid breaking compatibility. - v0.2.1 : Make go-getable, now that go.net/html is Go1.0-compatible (thanks to @matrixik for pointing this out).
- v0.2.0 : Add support for negative indices in Slice(). BREAKING CHANGE
Document.Rootis removed,Documentis now aSelectionitself (a selection of one, the root element, just likeDocument.Rootwas before). Add jQuery's Closest() method. - v0.1.1 : Add benchmarks to use as baseline for refactorings, refactor Next...() and Prev...() methods to use the new html package's linked list features (Next/PrevSibling, FirstChild). Good performance boost (40+% in some cases).
- v0.1.0 : Initial release.
goquery exposes two structs, Document and Selection, and the Matcher interface. Unlike jQuery, which is loaded as part of a DOM document, and thus acts on its containing document, goquery doesn't know which HTML document to act upon. So it needs to be told, and that's what the Document type is for. It holds the root document node as the initial Selection value to manipulate.
jQuery often has many variants for the same function (no argument, a selector string argument, a jQuery object argument, a DOM element argument, ...). Instead of exposing the same features in goquery as a single method with variadic empty interface arguments, statically-typed signatures are used following this naming convention:
- When the jQuery equivalent can be called with no argument, it has the same name as jQuery for the no argument signature (e.g.:
Prev()), and the version with a selector string argument is calledXxxFiltered()(e.g.:PrevFiltered()) - When the jQuery equivalent requires one argument, the same name as jQuery is used for the selector string version (e.g.:
Is()) - The signatures accepting a jQuery object as argument are defined in goquery as
XxxSelection()and take a*Selectionobject as argument (e.g.:FilterSelection()) - The signatures accepting a DOM element as argument in jQuery are defined in goquery as
XxxNodes()and take a variadic argument of type*html.Node(e.g.:FilterNodes()) - The signatures accepting a function as argument in jQuery are defined in goquery as
XxxFunction()and take a function as argument (e.g.:FilterFunction()) - The goquery methods that can be called with a selector string have a corresponding version that take a
Matcherinterface and are defined asXxxMatcher()(e.g.:IsMatcher())
Utility functions that are not in jQuery but are useful in Go are implemented as functions (that take a *Selection as parameter), to avoid a potential naming clash on the *Selection's methods (reserved for jQuery-equivalent behaviour).
The complete package reference documentation can be found here.
Please note that Cascadia's selectors do not necessarily match all supported selectors of jQuery (Sizzle). See the cascadia project for details. Also, the selectors work more like the DOM's querySelectorAll, than jQuery's matchers - they have no concept of contextual matching (for some concrete examples of what that means, see this ticket). In practice, it doesn't matter very often but it's something worth mentioning. Invalid selector strings compile to a Matcher that fails to match any node. Behaviour of the various functions that take a selector string as argument follows from that fact, e.g. (where ~ is an invalid selector string):
Find("~")returns an empty selection because the selector string doesn't match anything.Add("~")returns a new selection that holds the same nodes as the original selection, because it didn't add any node (selector string didn't match anything).ParentsFiltered("~")returns an empty selection because the selector string doesn't match anything.ParentsUntil("~")returns all parents of the selection because the selector string didn't match any element to stop before the top element.
See some tips and tricks in the wiki.
Adapted from example_test.go:
package main
import (
"fmt"
"log"
"net/http"
"github.com/PuerkitoBio/goquery"
)
func ExampleScrape() {
// Request the HTML page.
res, err := http.Get("http://metalsucks.net")
if err != nil {
log.Fatal(err)
}
defer res.Body.Close()
if res.StatusCode != 200 {
log.Fatalf("status code error: %d %s", res.StatusCode, res.Status)
}
// Load the HTML document
doc, err := goquery.NewDocumentFromReader(res.Body)
if err != nil {
log.Fatal(err)
}
// Find the review items
doc.Find(".left-content article .post-title").Each(func(i int, s *goquery.Selection) {
// For each item found, get the title
title := s.Find("a").Text()
fmt.Printf("Review %d: %s\n", i, title)
})
}
func main() {
ExampleScrape()
}- Goq, an HTML deserialization and scraping library based on goquery and struct tags.
- andybalholm/cascadia, the CSS selector library used by goquery.
- suntong/cascadia, a command-line interface to the cascadia CSS selector library, useful to test selectors.
- gocolly/colly, a lightning fast and elegant Scraping Framework
- gnulnx/goperf, a website performance test tool that also fetches static assets.
- MontFerret/ferret, declarative web scraping.
- tacusci/berrycms, a modern simple to use CMS with easy to write plugins
- Dataflow kit, Web Scraping framework for Gophers.
- Geziyor, a fast web crawling & scraping framework for Go. Supports JS rendering.
- Pagser, a simple, easy, extensible, configurable HTML parser to struct based on goquery and struct tags.
- stitcherd, A server for doing server side includes using css selectors and DOM updates.
- goskyr, an easily configurable command-line scraper written in Go.
- goGetJS, a tool for extracting, searching, and saving JavaScript files (with optional headless browser).
- fitter, a tool for selecting values from JSON, XML, HTML and XPath formatted pages.
- seltabl, an orm-like package and supporting language server for extracting values from HTML
There are a number of ways you can support the project:
- Use it, star it, build something with it, spread the word!
- If you do build something open-source or otherwise publicly-visible, let me know so I can add it to the Related Projects section!
- Raise issues to improve the project (note: doc typos and clarifications are issues too!)
- Please search existing issues before opening a new one - it may have already been addressed.
- Pull requests: please discuss new code in an issue first, unless the fix is really trivial.
- Make sure new code is tested.
- Be mindful of existing code - PRs that break existing code have a high probability of being declined, unless it fixes a serious issue.
- Sponsor the developer
- See the Github Sponsor button at the top of the repo on github
- or via BuyMeACoffee.com, below
The BSD 3-Clause license, the same as the Go language. Cascadia's license is here.
![dependabot[bot] avatar](https://avatars.githubusercontent.com/in/29110?v=4 "dependabot[bot]")
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