Argument of type 'number' is not assignable to parameter of type 'string'

Question

I was trying to set UNIX time in local storage by:

let dt: number = Date.now();
localStorage.setItem('logged', dt+864000000);

Returning with error: Argument of type 'number' is not assignable to parameter of type 'string'

It's giving the same error when i use getItem to read the logged data.

Any solution?

T.J. Crowder · Accepted Answer · 2017-12-21 09:24:33Z

7

All items in local storage are strings. You're trying to pass a number in as the second argument to setItem when setItem's second paramter is type string, so naturally TypeScript warns you (because you've asked for type safety) that you can't do that.

If you want to store in local storage, explicitly turn it into a string:

let dt: number = Date.now();
localStorage.setItem('logged', String(dt+864000000));

answered Dec 21, 2017 at 9:24

T.J. Crowder

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1 Comment

Fresco Over a year ago

Thank you, this is also correct for the first problem but unfortunately I can mark only one answer.

Mustafa Lokhandwala · Accepted Answer · 2017-12-21 09:22:48Z

6

Just try this

let dt: number = Date.now();
localStorage.setItem('logged', ""+dt+864000000);

Hope this works for you

answered Dec 21, 2017 at 9:22

Mustafa Lokhandwala

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3 Comments

Fresco Over a year ago

let logged: number = localStorage.getItem('logged'); returns Type 'string' is not assignable to type 'number'.

Mustafa Lokhandwala Over a year ago

use this let logged: number = Number(localStorage.getItem('logged'));

Mustafa Lokhandwala Over a year ago

glad that it helps you , please tick the answer for more convenience of users

Efeyabel · Accepted Answer · 2017-12-21 09:23:22Z

0

This worked for me:

let dt = Date.now();
localStorage.setItem('logged', dt+864000000);

And when localStorage.getItem('logged')

"1514712216523"

answered Dec 21, 2017 at 9:23

Efeyabel

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