How to extract map from json string?

I have this json:SBHJm ,./tf,dj kmlhsZdsbnmifgkldsf;kbnrfposfj mfgiofsmkv fgopktmfiosadznjeriosdbnmseroidzjbm iosersj ioz;dknrwfdc iOSRZdfhntfrwaio;dxcmjsterkd0pofg dmfpos mjrsepodhnjsew2gioxhjnmkw2eospjkrepo'd,j-0p]z[tmhjoe[apwtjmdyt,]-9op524RMJNW45OEPNHJM53,94-0WPH5S4RTKL4EJR-903EIK-O0JHYTK2QW]-0MS,UK4Wope0skjdytpof[4r21mwejn9eopwkm5ret-0pyt,k21qom-p[k,tl[]3q,kwqpmjpogtmpolI have this json:SBHJm ,./tf,dj kmlhsZdsbnmifgk