django save/read images in base64 string reference

reference:
https://www.npmjs.com/package/image-to-base64
https://www.browserling.com/tools/image-to-base64
https://codebeautify.org/base64-to-image-converter
https://stackoverflow.com/questions/42395034/how-to-display-binary-data-as-image-in-react

react events
https://reactjs.org/docs/events.html#focus-events

django textfield
https://stackoverflow.com/questions/38849201/how-to-serialize-bigintegerfield-textfield-in-serializer-django
https://stackoverflow.com/questions/38316321/change-a-field-in-a-django-rest-framework-modelserializer-based-on-the-request-t