javascript Object property undefined, but it's there

Question

i have a json-file looking like this:

 { "results": { "name1": { "printouts": { "property1": [{ "someName": "someText", "someName2": "someURL", "someName3": integer, "someName4": boolean } ], "property2": [ "someText" ], "property3": [ "someText" ], "property4": [ "someText" ], "property5": [ "someText" ], "property6": [ "someText" ] }, "someName": "someText", "someName2": "someURL", "someName3": integer, "someName4": boolean }, "name2": { "printouts": { "property1": [{ "fulltext": "someText", "fullurl": "someURL", "namespace": integer, "exists": boolean } ], "property2": [ "someText" ], "property3": [ "someText" ], "property4": [ "someText" ], "property5": [ "someText" ], "property6": [ "someText" ] }, "someName": "someText", "someName2": "someURL", "someName3": integer, "someName4": boolean }, ...... }

What i want is to access property6 of each object in printouts. What i've done so far:

 for (i in results) { if (someOtherArray.length < 1) { someOtherArray.push(i.printouts.property6.toString()); }

But this gets me Error: Cannot read property property6 of undefined. What am i doing wrong?

Any Idea? Thanks.

results should be an array, instead of an object, because of the double name property. — Nina Scholz
– Nina Scholz, Commented Jan 5, 2017 at 12:04
Looks like you have an extra " in there after someText ► "property5": [someText"], — Nope
– Nope, Commented Jan 5, 2017 at 12:04
i will hold key name in string. You will have to use results[i] to get object — Rajesh Dixit
– Rajesh Dixit, Commented Jan 5, 2017 at 12:05

Nina Scholz · Accepted Answer · 2017-01-05 12:44:22Z

Basically you have the wrong access to the property with

i.printouts.property6

it needs to be an object with a property accessor with bracket notation for a variable.

data.results[i].printouts.property6 //^^^^^^^^^^^^^

Then you could iterate over the keys and select the property you want.

var data = { results: { name1: { printouts: { property1: [{ someName: "someText", someName2: "someURL", someName3: 33, someName4: false }], property2: ["someText"], property3: ["someText"], property4: ["someText"], property5: ["someText"], property6: ["someText"] }, someName: "someText", someName2: "someURL", someName3: 37, someName4: true }, name2: { printouts: { property1: [{ fulltext: "someText", fullurl: "someURL", namespace: 35, "exists": true }], property2: ["someText"], property3: ["someText"], property4: ["someText"], property5: ["someText"], property6: ["someText"] }, someName: "someText", someName2: "someURL", someName3: 34, someName4: false } } }; Object.keys(data.results).forEach(function (k) { console.log(data.results[k].printouts.property6); });

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