Xray-core — Config Layout

Xray-core reads a single JSON document at startup. The root object maps directly to Go struct Config at infra/conf/xray.go:388. Every top-level field below corresponds to one JSON key.

Root keys

Key	Go field	Type	Page	Description
env	Env	EnvConfig (map[string]string)	—	Environment variables applied via os.Setenv before the rest of the config is built. Merged across multi-file configs (later files override same keys).
log	LogConfig	LogConfig	Log	Access and error log streams, level, DNS-query logging, IP masking.
dns	DNSConfig	DNSConfig	DNS	DNS resolver, server list, query strategy, fakedns linkage.
routing	RouterConfig	RouterConfig	Routing	Domain strategy, rules, balancers.
inbounds	InboundConfigs	[]InboundDetourConfig	Inbounds	List of listening services.
outbounds	OutboundConfigs	[]OutboundDetourConfig	Outbounds	List of upstream proxy targets.
policy	Policy	PolicyConfig	Policy	Per-level timeouts, buffer size, user-stats toggles, system-stats toggles.
api	API	APIConfig	API	gRPC management API inbound (tag + listen + service list).
stats	Stats	StatsConfig	Stats	Empty struct; presence enables the stats subsystem.
metrics	Metrics	MetricsConfig	Metrics	Prometheus exporter (tag + listen).
reverse	Reverse	ReverseConfig	Reverse	Reverse-proxy bridges and portals.
fakeDns	FakeDNS	FakeDNSConfig	FakeDNS	Fake-IP pool config (single object or array).
observatory	Observatory	ObservatoryConfig	Observatory	Outbound latency probing.
burstObservatory	BurstObservatory	BurstObservatoryConfig	Burst Observatory	Concurrent latency probing with health-check tuning.
version	Version	VersionConfig	Version	Optional min/max version requirement.
transport	Transport	map[string]json.RawMessage	Deprecated	Not used; present only so a config that sets it gets an explanatory error.

At a glance

{
  "log": { "loglevel": "warning" },
  "dns": {},
  "routing": { "rules": [] },
  "inbounds": [],
  "outbounds": [],
  "policy": { "levels": { "0": { "handshake": 4 } } },
  "api": { "tag": "api", "listen": "127.0.0.1:10085", "services": ["HandlerService", "StatsService"] },
  "stats": {},
  "metrics": { "tag": "metrics", "listen": "127.0.0.1:9099" }
}

Source: infra/conf/xray.go:388-409 · v26.9.9 (52a412d)