Not able to get JSON value dynamically [duplicate]

Question

I am working on the following snippet. Why am I not able to get the

let node = 'Em2'; console.log(data.node.c2);

work? As you can see I am able to get data while passing data.Em2.c1 but a dynamic format like this let node = 'Em2'; console.log(data.node.c2); I am getting this error

TypeError: Cannot read property 'c2' of undefined

Code:

var data ={ "Em1": { "c1":"#FFF", "c2":"#EEE" }, "Em2": { "c1":"#DDD", "c2":"#ooo" } } let node = 'Em2'; console.log(data.Em2.c1); console.log(data.node.c2);

var data ={ "Em1": { "c1":"#FFF", "c2":"#EEE" }, "Em2": { "c1":"#DDD", "c2":"#ooo" } } let node = 'Em2'; console.log(data.Em2.c1); console.log(data.node.c2);

Sasha · Accepted Answer · 2018-09-28 00:13:46Z

2

Use square braces [] to access object member via variable

var data ={ "Em1": { "c1":"#FFF", "c2":"#EEE" }, "Em2": { "c1":"#DDD", "c2":"#ooo" } } let node = 'Em2'; console.log(data.Em2.c1); console.log(data[node].c2);

Similar question: how to access object property using variable

edited Sep 28, 2018 at 0:13

answered Sep 28, 2018 at 0:06

Sasha

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2 Comments

Mona Coder Over a year ago

Thanks Alex but why [] ?!

Sasha Over a year ago

@Mona if you don't use square braces, js tries to use named property node in your object, not property named in variable node

Paul McLoughlin · Accepted Answer · 2018-09-28 00:06:38Z

0

Instead of console.log(data.node.c2), try console.log(data[node][c2])

answered Sep 28, 2018 at 0:06

Paul McLoughlin

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