How does php transmit binary images in json format?

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This is the binary form of the image.
{"Image" :{}, "session_id": "O: 27: \" GuzzleHttp \ Cookie \ CookieJar \ ": 2: {s: 36: \ "\ uw.guzzlehttp \ Cookie \ CookieJar \ uw.cookies \"; a: 1: {I: 0; O: 27: \ "GuzzleHttp \ Cookie \ SetCookie \": 1: {s: 33: \ "\ uw.guzzlehttp \ Cookie \ SetCookie \ uw.data \"; a: 9: {s: 4: \ "Name \"; s: 10: \ "JSESSIONID \"; s: 5: \ "Value \"; s: 21: \ "deaxSSQVARpvY5yOJiqXu \"; s: 6: \ "Domain \"; s: 15: \ "202.119.113.135 \"; s: 4: \ "Path \"; s: 1: \ "\/\"; s: 7: \ "Max-Age \"; n; s: 7: \ "Expires \"; N; s: 6: \ "Secure \"; B: 0; s: 7: \ "Discard \"; B: 0; s: 8: \ "HttpOnly \"; B: 0 ;}}s: 39: \ "\ uw.guzzlehttp \ Cookie \ CookieJar \ uw.strictmode \"; B: 0;} "," error_code ": 0}
You can see that the image is in the binary format of the image, but the conversion to json is not required. how to transmit the binary format of the image in json format?