JSON.stringify: JSON string will be empty [duplicate]

Question

var clients = [];

var tmp = [];

tmp["username"] = rows[0].username;
tmp["rank"] = rows[0].rank;
tmp["lastaction"] = "0";
tmp["connection"] = connection;
clients.push(tmp);

JSON.stringify(clients)

I initialized an array (clients) and pushed an associative array (tmp) to the clients array. But if I "stringify" the client, it will just return "[[]]".

What did I wrong?

Thank you in advance.

try like below. var tmp = {}; there is no concept of associative array in js. it is json object. — rajesh
– rajesh, Commented Jan 21, 2017 at 18:30

Christos · Accepted Answer · 2017-01-21 18:30:54Z

5

You should turn tmp to an object literal rather than an array literal.

var clients = [];

var tmp = {};

tmp["username"] = "foo";
tmp["rank"] = 1;
tmp["lastaction"] = "0";
tmp["connection"] = "bar";
clients.push(tmp);

console.log(JSON.stringify(clients))

answered Jan 21, 2017 at 18:30

Christos

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Man Programmer · Accepted Answer · 2017-01-21 18:29:51Z

3

update your code like this

var tmp = {};

Asssociative array has not support directly in javascript you can make as object

answered Jan 21, 2017 at 18:29

Man Programmer

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2 Comments

Reese Over a year ago

Thank you, but this throws an error when sending it to the node.js client: connection.sendUTF(JSON.stringify({response: "loginsucceed", onlinelist: JSON.stringify(clients)})); "TypeError: Converting circular structure to JSON"

Man Programmer Over a year ago

please follow this link might be it will helps you stackoverflow.com/questions/11616630/…

Max Sindwani · Accepted Answer · 2017-01-21 18:31:05Z

1

You need to initialize tmp as an object:

var clients = [];

var tmp = {};

tmp["username"] = 'username';
tmp["rank"] = 1
tmp["lastaction"] = 2
tmp["connection"] = 3
clients.push(tmp);

console.log(JSON.stringify(clients));

answered Jan 21, 2017 at 18:31

Max Sindwani

1,2677 silver badges15 bronze badges

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