i am using following code, i am getting 200 ok but no issues getting detected. i am new to this. what am i doing it here wrong

{ "url" : "https://demo.testfire.net/login.jsp", "http" : { "user_agent" : "Arachni/v2.0dev", "request_timeout" : 10000, "request_redirect_limit" : 5, "request_concurrency" : 20, "request_queue_size" : 100, "request_headers" : {}, "response_max_size" : 500000, "cookies" : {} }, "audit" : { "elements" : ["link", "form", "cookie"], "parameter_values" : true, "exclude_vector_patterns" : [], "include_vector_patterns" : [], "link_templates" : [], "links" : true, "forms" : true, "cookies" : true, "headers" : false, "with_both_http_methods" : false, "cookies_extensively" : false, "jsons" : true, "xmls" : true, "ui_forms" : true, "ui_inputs" : true }, "input" : { "values" : {}, "default_values" : { "(?i-mx:name)" : "arachni_name", "(?i-mx:user)" : "arachni_user", "(?i-mx:usr)" : "arachni_user", "(?i-mx:pass)" : "5543!%arachni_secret", "(?i-mx:txt)" : "arachni_text", "(?i-mx:num)" : "132", "(?i-mx:amount)" : "100", "(?i-mx:mail)" : "[email blocked]", "(?i-mx:account)" : "12", "(?i-mx:id)" : "1" }, "without_defaults" : false, "force" : false }, "browser_cluster" : { "wait_for_elements" : {}, "pool_size" : 6, "job_timeout" : 25, "worker_time_to_live" : 100, "ignore_images" : false, "screen_width" : 1600, "screen_height" : 1200 }, "scope" : { "redundant_path_patterns" : {}, "dom_depth_limit" : 5, "exclude_path_patterns" : [], "exclude_content_patterns" : [], "include_path_patterns" : [], "restrict_paths" : [], "extend_paths" : [], "url_rewrites" : {}, "include_subdomains" : false, "exclude_binaries" : true, "auto_redundant_paths" : 2, "https_only" : false

}, "session" : {}, "checks" : [], "platforms" : [ "linux", "mongodb", "java" ], "plugins" : {}, "no_fingerprinting" : false, "authorized_by" : null }