# reviveNumber
> Revive a JSON-serialized number.
## Usage
```javascript
var reviveNumber = require( '@stdlib/number/float64/reviver' );
```
#### reviveNumber( key, value )
Revives a JSON-serialized number.
```javascript
var parseJSON = require( '@stdlib/utils/parse-json' );
var str = '{"type":"float64","value":"NaN"}';
var buf = parseJSON( str, reviveNumber );
// returns NaN
```
For details on the JSON serialization format, see [`@stdlib/number/float64/to-json`][@stdlib/number/float64/to-json].
## Examples
```javascript
var parseJSON = require( '@stdlib/utils/parse-json' );
var number2json = require( '@stdlib/number/float64/to-json' );
var reviveNumber = require( '@stdlib/number/float64/reviver' );
var str = JSON.stringify( number2json( NaN ) );
console.log( str );
// => '{"type":"float64","value":"NaN"}'
var out = parseJSON( str, reviveNumber );
if ( out instanceof Error ) {
throw out;
}
console.log( out );
// => NaN
```
[@stdlib/number/float64/to-json]: https://github.com/stdlib-js/number/tree/main/float64/to-json