# How to convert a string to an integer in JavaScript?

###### Posted By: Anonymous

How do I convert a string to an integer in JavaScript?

## Solution

The simplest way would be to use the native `Number`

function:

```
var x = Number("1000")
```

If that doesn’t work for you, then there are the **parseInt**, **unary plus**, **parseFloat with floor**, and **Math.round** methods.

parseInt:

```
var x = parseInt("1000", 10); // you want to use radix 10
// so you get a decimal number even with a leading 0 and an old browser ([IE8, Firefox 20, Chrome 22 and older][1])
```

unary plus

if your string is already in the form of an integer:

```
var x = +"1000";
```

if your string is or might be a float and you want an integer:

```
var x = Math.floor("1000.01"); //floor automatically converts string to number
```

or, if you’re going to be using Math.floor several times:

```
var floor = Math.floor;
var x = floor("1000.01");
```

If you’re the type who forgets to put the radix in when you call parseInt, you can use parseFloat and round it however you like. Here I use floor.

```
var floor = Math.floor;
var x = floor(parseFloat("1000.01"));
```

Interestingly, Math.round (like Math.floor) will do a string to number conversion, so if you want the number rounded (or if you have an integer in the string), this is a great way, maybe my favorite:

```
var round = Math.round;
var x = round("1000"); //equivalent to round("1000",0)
```

###### Answered By: Anonymous

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