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jsonpath
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A Go implementation of JSONPath
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README.md
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jsonpath
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[](https://travis-ci.org/yalp/jsonpath) This was mostly an experiment to learn go and test using closures to interpret a JSON path. You should use https://github.com/PaesslerAG/jsonpath instead. # jsonpath a (partial) implementation in [Go](http://golang.org) based on [Stefan Goener JSON Path](http://goessner.net/articles/JsonPath/) ## Limitations * No support for subexpressions : `$books[(@.length-1)]` * No support for filters : `$books[?(@.price > 10)]` * Strings in brackets must use double quotes : `$["bookstore"]` * Cannot operate on struct fields The third limitation comes from using the `text/scanner` package from the standard library. The last one could be overcome by using reflection. ## JsonPath quick intro All expressions start `$`. Examples (supported by the current implementation) : * `$` the current object (or array) * `$.books` access to the key of an object (or `$["books"]`with bracket syntax) * `$.books[1]` access to the index of an array * `$.books[1].authors[1].name` chaining of keys and index * `$["books"][1]["authors"][1]["name"]` the same with braket syntax * `$.books[0,1,3]` union on an array * `$["books", "songs", "movies"]` union on an object * `$books[1:3]` second and third items of an array * `$books[:-2:2]` every two items except the last two of an array * `$books[::-1]` all items in reversed order * `$..authors` all authors (recursive search) Checkout the [tests](jsonpath_test.go) for more examples. ## Install go get github.com/yalp/jsonpath ## Usage A jsonpath applies to any JSON decoded data using `interface{}` when decoded with [encoding/json](http://golang.org/pkg/encoding/json/) : var bookstore interface{} err := json.Unmarshal(data, &bookstore) authors, err := jsonpath.Read(bookstore, "$..authors") A jsonpath expression can be prepared to be reused multiple times : allAuthors, err = jsonpath.Prepare("$..authors") ... var bookstore interface{} err := json.Unmarshal(data, &bookstore) authors, err := allAuthors(bookstore) The type of the values returned by the `Read` method or `Prepare` functions depends on the jsonpath expression.
