Function json_atob

json_atob(data: string): string | null
Decodes a string of data which has been encoded using Base64 encoding.
Parameters
- data: string
  Base64 encoded string.
Returns string | null
The decoded string or null if the encoding failed.
Example
```
// Encode base64
let encoded = json_btoa("Hello World!");
// Decode base64
let decoded = json_atob(encoded);
```
- Defined in codemelted.js:2097