What should I use to save my files?

I want to create markers on a map which should have values like : name, coords setNr etc.
These datas should remain after app newstart and be saved on the device.
The best way for me to save these “markers” would be an array or json format, but i dont know if there is any way to save these in file form and change them or add a new one to the list.
Is there any way or any tool that I could use, or do I have to use a database ?
Many thanks in advance,

Take a look at ionic storage.