How to use json_array_parse

I want to parse the following JSON

{
"ver": 3,
"mode": "online",
"custom": {
"apl1": [
"off"
]
}
}

Tell me about how to parse json and how to write code
The keywords I researched are bellow
json_arr_parse
・json_obj_parse
・JSON_OBJ_DESCR_ARRAY
・JSON_OBJ_DESCR_OBJ_ARRAY
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