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Searching through JSON
//return an array of objects according to key, value, or key and value matching
function getObjects(obj, key, val) {
var objects = [];
for (var i in obj) {
if (!obj.hasOwnProperty(i)) continue;
if (typeof obj[i] == 'object') {
objects = objects.concat(getObjects(obj[i], key, val));
} else
//if key matches and value matches or if key matches and value is not passed (eliminating the case where key matches but passed value does not)
if (i == key && obj[i] == val || i == key && val == '') { //
objects.push(obj);
} else if (obj[i] == val && key == ''){
//only add if the object is not already in the array
if (objects.lastIndexOf(obj) == -1){
objects.push(obj);
}
}
}
return objects;
}
//return an array of values that match on a certain key
function getValues(obj, key) {
var objects = [];
for (var i in obj) {
if (!obj.hasOwnProperty(i)) continue;
if (typeof obj[i] == 'object') {
objects = objects.concat(getValues(obj[i], key));
} else if (i == key) {
objects.push(obj[i]);
}
}
return objects;
}
//return an array of keys that match on a certain value
function getKeys(obj, val) {
var objects = [];
for (var i in obj) {
if (!obj.hasOwnProperty(i)) continue;
if (typeof obj[i] == 'object') {
objects = objects.concat(getKeys(obj[i], val));
} else if (obj[i] == val) {
objects.push(i);
}
}
return objects;
}
var json = '{"glossary":{"title":"example glossary","GlossDiv":{"title":"S","GlossList":{"GlossEntry":{"ID":"SGML","SortAs":"SGML","GlossTerm":"Standard Generalized Markup Language","Acronym":"SGML","Abbrev":"ISO 8879:1986","GlossDef":{"para":"A meta-markup language, used to create markup languages such as DocBook.","ID":"44","str":"SGML","GlossSeeAlso":["GML","XML"]},"GlossSee":"markup"}}}}}';
var js = JSON.parse(json);
//example of grabbing objects that match some key and value in JSON
console.log(getObjects(js,'ID','SGML'));
//returns 1 object where a key names ID has the value SGML
//example of grabbing objects that match some key in JSON
console.log(getObjects(js,'ID',''));
//returns 2 objects since keys with name ID are found in 2 objects
//example of grabbing obejcts that match some value in JSON
console.log(getObjects(js,'','SGML'));
//returns 2 object since 2 obects have keys with the value SGML
//example of grabbing objects that match some key in JSON
console.log(getObjects(js,'ID',''));
//returns 2 objects since keys with name ID are found in 2 objects
//example of grabbing values from any key passed in JSON
console.log(getValues(js,'ID'));
//returns array ["SGML", "44"]
//example of grabbing keys by searching via values in JSON
console.log(getKeys(js,'SGML'));
//returns array ["ID", "SortAs", "Acronym", "str"]
@ronnieserr

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@ronnieserr ronnieserr commented Nov 28, 2013

Hi iwek,

The find-in-json gist is great! Could you extend it to an array of keys or values (rather than a single one)?

Thanks,

Ronnie Serr
ronnie@alpahbethouse.com

@sridharrao

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@sridharrao sridharrao commented Jan 2, 2014

Hi iwek,

Its interesting. However, is there a way I can give search based on regular expression?

Thanks & Regards,
-Sridhar

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@d3netxer d3netxer commented Feb 7, 2015

iwek, this code is amazing. Thank you!

@jmalmin

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@jmalmin jmalmin commented May 2, 2016

Thank you.. I needed to have the very clear directions you provided. Very nice of you to help others.

@SiriusBlackFi

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@SiriusBlackFi SiriusBlackFi commented Jan 18, 2018

Thank you very much~That's really helpful.

@hijaren

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@hijaren hijaren commented Jul 26, 2018

Thank you!

@Zerumi

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@Zerumi Zerumi commented Sep 15, 2019

Thanks a lot

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