default language is always en

[kindslayer]

Is it impossible to set callback language or default language?

[stefalda]

The fallback language or default is the first defined language...

[kindslayer]

This is my string file but default language is english ...

// ES6 module syntax
import LocalizedStrings from 'react-localization';

let strings = new LocalizedStrings({
 fa:{
   Hello:"سلام",
 },
 en: {
   Hello:"Hello man",
 }
})

[stefalda]

Could be that your browser is detected as english or the language is not fa?