Jsonpath for JS

/** * @license * JSONPath 0.8.0-xpath for JSON * * Copyright (c) Stefan Goessner         (goessner.net) * Licensed under the MIT (mit-license.txt) licence. * * @param {object| Array} obj * @param {String} expr * @param {Object} [arg] * @returns {array|false}*/        functionJsonPath (obj, expr, arg) {varP ={Resulttype:arg&& Arg.resulttype | | ' VALUE ', Result: [], Normalize:function(expr) {varSUBX = []; returnExpr.replace (/[\[') (\?? \ (. *?\)) [\] ']/g,function($ A, $) {                        return' [# ' + (Subx.push ($ 1) + '] '; }). replace (/'? \. '? | \['?/g, '; '). Replace (/;;;|;;/ g, ';..; '). Replace (/;$| '?]| ') $/g, "). Replace (/# ([0-9]+)/g,function($ A, $) {                        returnSubx[$1];                }); }, Aspath:function(path) {varx = Path.split (';'), p = ' $ ';  for(vari = 1, n = x.length; I < n; i++) P+ =/^[0-9*]+$/.test (X[i])? ' [' + x[i] + '] ': ' [\ ' + x[i] + ' \ '] '; returnp; }, Store:function(P, v) {if(P) p.result[p.result.length]= P.resulttype = = = ' PATH '?P.aspath (P): v; return!!p; }, Trace:function(expr, Val, path) {if(expr) {varx = Expr.split (';'), loc =X.shift (); X= X.join ('; ')); if(Val &&val.hasownproperty (Loc)) P.trace (x, Val[loc], path+ '; ' +Loc); Else if(loc = = = ' * ')) P.walk (Loc, X, Val, Path,function(M, l, X, V, p) {P.trace (M+ '; ' +x, V, p);                        }); Else if(loc = = = ' ... ')) {p.trace (x, Val, path); P.walk (Loc, X, Val, Path,function(M, l, X, V, p) {typeofV[m] = = = ' object ' && p.trace (' ...; ' + x, V[m], P + '; ' +m);                        }); } Else if(/,/. Test (Loc)) {                            //[name1,name2,...]                             for(vars = loc.split (/'?, '?/), I = 0, n = s.length; I < n; i++) P.trace (S[i]+ '; ' +x, Val, path); } Else if(/^\(.*?\)$/. Test (Loc))//[(expr)]P.trace (P.eval (Loc, Val, path.substr (path.lastindexof (';') + 1)) + '; ' +x, Val, path); Else if(/^\?\(.*?\)$/. Test (Loc))// [?( Expr)]P.walk (Loc, X, Val, Path,function(M, l, X, V, p) {if(P.eval (L.replace) (/^\?\ (. *?) \) $/, ' $ '), V[m], M)) P.trace (M+ '; ' +x, V, p);                        }); Else if(/^(-? [0-9]*):(-? [0-9]*):? ([0-9]*) $/. Test (Loc))//[start:end:step] Phyton slice syntaxp.slice (Loc, X, Val, path); } ElseP.store (Path, Val); }, walk:function(Loc, expr, Val, path, f) {if(ValinstanceofArray) {                         for(vari = 0, n = val.length; I < n; i++)                            if(IinchVal) F (i, Loc, expr, Val, path); } Else if(typeofval = = = ' object ') {                         for(varMinchval)if(Val.hasownproperty (M)) F (M, loc, expr, Val, path); }}, Slice:function(Loc, expr, Val, path) {if(ValinstanceofArray) {                        varLen = val.length, start = 0, end = len, step = 1; Loc.replace (/^(-? [0-9]*):(-? [0-9]*):? (-? [0-9]*] $/g,function($ A, $ $, $) {Start= parseint ($ | |start); End= parseint ($ | |end); Step= parseint ($ | |step);                        }); Start= Start < 0? Math.max (0, start +len): Math.min (len, start); End= End < 0? Math.max (0, End +len): Math.min (len, end);  for(vari = start; I < end; i + =Step) P.trace (i+ '; ' +expr, Val, path); }}, Eval:function(x, _v) {Try {                        return$ && _v && eval (x.replace (/@/g, ' _v ')); } Catch(e) {Throw NewSyntaxError (' JsonPath: ' + e.message + ': ' + x.replace (/@/g, ' _v '). Replace (/\^/g, ' _a ')));            }                }            }; var$ =obj; if(Expr && obj && (p.resulttype = = ' VALUE ' | | P.resulttype = = ' PATH ') {p.trace (p.normalize (expr). Replace (/^\$;/, '), obj, ' $ '); returnP.result.length? P.result:false; }        }

JSONPath	Description
$	The root object/element
@	The current object/element
.	Child Member operator
..	Recursive descendant operator; JSONPath borrows this syntax from e4x
*	Wildcard matching all objects/elements regardless their names
[]	Subscript operator
[,]	Union operator for alternate names or array indices as a set
[start:end:step]	Array slice operator borrowed from Es4/python
?()	Applies a filter (script) expression via static evaluation
()	Script expression via static evaluation

Given This sample data set, see Example expressions below:

{  "Store": {    "Book": [       {        "category": "Reference",        "Author": "Nigel Rees",        "title": "Sayings of the Century",        "Price": 8.95      }, {        "Category": "Fiction",        "Author": "Evelyn Waugh",        "title": "Sword of Honour",        "Price": 12.99      }, {        "Category": "Fiction",        "Author": "Herman Melville",        "title": "Moby Dick",        "ISBN": "0-553-21311-3",        "Price": 8.99      }, {         "Category": "Fiction",        "Author": "J. R. R. Tolkien",        "title": "The Lord of the Rings",        "ISBN": "0-395-19395-8",        "Price": 22.99      }    ],    "Bicycle": {      "Color": "Red",      "Price": 19.95    }  }}

Example JSONPath Expressions:

JSONPath	Description
$.store.book[*].author	The authors of all books in the store
$..author	All authors
$.store.*	All things in store, which is some books and a red bicycle
$.store..price	The price of everything in the store
$..book[2]	The third book
$..book[(@.length-1)]	The last book via script subscript
$..book[-1:]	The last book via Slice
$..book[0,1]	The first and the books via subscript union
$..book[:2]	The first and the books via subscript array slice
$..book[?(@.isbn)]	Filter All books with ISBN number
$..book[?(@.price<10)]	Filter all books cheaper than 10
$..book[?(@.price==8.95)]	Filter All Books 8.95
$..book[?(@.price<30 && @.category=="fiction")]	Filter all fiction books cheaper than 30
$..*	All members of JSON structure

Jsonpath for JS