<p>Is this defined by the language? Is there a defined maximum? Is it different in different browsers?</p>

>= ES6:
```
```
Number.MIN_SAFE_INTEGER;
Number.MAX_SAFE_INTEGER;
```
```
<= ES5
From
the reference
:
```
```
Number.MAX_VALUE;
Number.MIN_VALUE;
```
```
```
```
console.log('MIN_VALUE', Number.MIN_VALUE);
console.log('MAX_VALUE', Number.MAX_VALUE);

console.log('MIN_SAFE_INTEGER', Number.MIN_SAFE_INTEGER); //ES6
console.log('MAX_SAFE_INTEGER', Number.MAX_SAFE_INTEGER); //ES6
```
```