How does react native get the base64 code of the picture according to the url of the picture in the mobile phone?

1, I got the address of the local picture on my phone through imagepicker. How can I get its base64 code?
the json structure of the image address is as follows:

"height": 218,
"url": "content://media/external/images/media/2522",
"width": 341,

Thank you!

Mar.07,2021

is converted by itself and sent back to the js side.
it seems that the react native imagepicker component can already get the base64 format

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e50877-450c5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e50877-450c5.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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