How can I replace n and t with the corresponding carriage return and tab characters in front-end or php?

{Code...} I want to display formatted easy-to-read json strings on the front end

{"msg":"{\n \"iaback\" : {\n \"code\" : -3522,\n \"msg\" : \"\"\n },\n \"iawork\" : {\n \"code\" : 0,\n \"msg\" : \"---------------LibRxTx Info:--------------\\nCurrent peer:\\t4\\nWork Thread 0 235\\nWork Thread 1 255\\nWork Thread 2 247\\nWork Thread 3 244\\nEpLoop\\t\\t2513\\nEpRead\\t\\t1876\\nEpMoreRead\\t0\\nEpWrite\\t\\t895\\nSndLoop\\t\\t2183\\nPeerSnd\\t\\t1805\\nSndSw\\t\\t0\\nBufSnd\\t\\t908\\nAccept\\t\\t1778\\nPeerRcv\\t\\t1085\\nBufRcv\\t\\t1974\\nAddJob\\t\\t988\\nGetJob\\t\\t986\\nGetMore\\t\\t985\\nPktSnd\\t\\t888\\nPktRcv\\t\\t889\\nSndWait\\t\\t0\\nSndWaitAck\\t0\\n-------> Epoll 0\\nIdx ID RID State pktSnd ackRcv pktRcv pktExe ackSnd bw(Bps) Zip Retry\\tName\\n0 1 0 Lsn 0 0 0 0 0 -1 100 0\/-1\\t 127.0.0.1:26826 <--> :\\n1 2 0 Try 0 0 0 0 0 -1 100 96\/-1\\t :44115 <--> 192.168.17.9:26828\\n2 891 0 OK 0 0 1 0 0 -1 100 0\/-1\\tIPC 127.0.0.1:26826 <--> 127.0.0.1:57872\\n\"\n }\n}\n","result":0} 

I want to display formatted readable json strings on the front end

Reply content:

{"msg":"{\n \"iaback\" : {\n \"code\" : -3522,\n \"msg\" : \"\"\n },\n \"iawork\" : {\n \"code\" : 0,\n \"msg\" : \"---------------LibRxTx Info:--------------\\nCurrent peer:\\t4\\nWork Thread 0 235\\nWork Thread 1 255\\nWork Thread 2 247\\nWork Thread 3 244\\nEpLoop\\t\\t2513\\nEpRead\\t\\t1876\\nEpMoreRead\\t0\\nEpWrite\\t\\t895\\nSndLoop\\t\\t2183\\nPeerSnd\\t\\t1805\\nSndSw\\t\\t0\\nBufSnd\\t\\t908\\nAccept\\t\\t1778\\nPeerRcv\\t\\t1085\\nBufRcv\\t\\t1974\\nAddJob\\t\\t988\\nGetJob\\t\\t986\\nGetMore\\t\\t985\\nPktSnd\\t\\t888\\nPktRcv\\t\\t889\\nSndWait\\t\\t0\\nSndWaitAck\\t0\\n-------> Epoll 0\\nIdx ID RID State pktSnd ackRcv pktRcv pktExe ackSnd bw(Bps) Zip Retry\\tName\\n0 1 0 Lsn 0 0 0 0 0 -1 100 0\/-1\\t 127.0.0.1:26826 <--> :\\n1 2 0 Try 0 0 0 0 0 -1 100 96\/-1\\t :44115 <--> 192.168.17.9:26828\\n2 891 0 OK 0 0 1 0 0 -1 100 0\/-1\\tIPC 127.0.0.1:26826 <--> 127.0.0.1:57872\\n\"\n }\n}\n","result":0} 

I want to display formatted readable json strings on the front end

Do you want to display formatted JSON in a browser?
Var_export (json_decode ($ json_string); try this. You can format and save the object structure.
But if you show it in a browser, it is estimated that the above is not suitable, and it also prints the object information.
There are two ways to display only JSON formatted characters. if you use PHP 5.4 or earlier, you need to write the processing function by yourself.
This can be done directly after version 5.4:
Echo json_encode ($ arr, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT );
The result is formatted.