pub fn interpolate_env_json(value: &mut Value)Expand description
Recursively interpolates ${ENV_VAR:-default} patterns in every string leaf
of a JSON value — object values, array elements, and nested combinations —
leaving numbers, booleans, and null untouched.
This brings the same ${ENV_VAR} substitution that load_yaml_with_env
applies to raw YAML text to config that arrives as already-parsed
structured data — i.e. plugin node config authored through the Admin API /
Web UI or delivered over etcd, which never passes through the file-text
interpolation path. Applied at graph-compile time it is source-agnostic: a
client_id: ${CLIENT_ID} set in the UI resolves exactly as it would in
gateway.yaml. File-loaded values were already interpolated before parsing,
so on them this is a no-op (the ${ fast-path guard skips them).