how to get json object from js array

Question

let awards = ["earth","sun","moon"];
let a = JSON.stringify(awards);
console.log(a);
Result: -["earth","sun","moon"] // no difference?

In my database, text field, I have this:

{"earth","sun","moon"};

update

from this I get php array using:

$arr = json_decode($data['planets'], true);

What is the difference between ["earth","sun","moon"] and {"earth","sun","moon"}

And how to get {"earth","sun","moon"} from js array - ["earth","sun","moon"];?

{"earth","sun","moon"} this is invalid json. {} - encodes object expecting "key": value pairs. But you have something array-like (comma separated values) — Yury Tarabanko
– Yury Tarabanko, Commented Feb 18, 2019 at 20:10
let awards = ["earth","sun","moon"]; const str =`{${awards.map(x => JSON.stringify(x))}}` should give the value you want. — Yury Tarabanko
– Yury Tarabanko, Commented Feb 18, 2019 at 20:14

Ty Rodriguez · Accepted Answer · 2019-02-18 20:18:50Z

1

An object will have the format { key : value }. For example, { "Earth" : "Planet" } is an object. But {"Earth", "Planet" } is not an object.

["earth","sun","moon"] is an array of strings. There is no way to just convert an array of strings into an object, because the operation doesn't really make sense.

Are you sure you are not missing colons in your database text field?

answered Feb 18, 2019 at 20:18

Ty Rodriguez

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2 Comments

Navid Yousefzai Over a year ago

you can convert an array of strings into an object : Object.assign({}, ['a','b','c']); ES6:{ ...['a', 'b', 'c'] }

Ty Rodriguez Over a year ago

Yes, you are correct. Object.assign({}, ['a','b','c']) will result in {0: "a", 1: "b", 2: "c"} The keys in this case will be the integers 0,1,2... and the values will be the elements in the array.

Jonathan Hamel · Accepted Answer · 2019-02-18 20:27:58Z

1

The difference between ["earth","sun","moon"] and {"earth","sun","moon"} is that the former is an array and the latter is a set.

var words = ["earth","sun","moon"];
var set = new Set(words) // {"earth","sun","moon"}

As for the json_decode, you need to specify if you want an associative array instead of an object. This could be causing the Array to change to a Set changes to the array in json.decode($data['planets'], true)

edited Feb 18, 2019 at 20:27

answered Feb 18, 2019 at 20:19

Jonathan Hamel

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