diff --git a/hydro_lang/src/compile/built.rs b/hydro_lang/src/compile/built.rs
index 6935c2abcc70..8f4dc09b22cb 100644
--- a/hydro_lang/src/compile/built.rs
+++ b/hydro_lang/src/compile/built.rs
@@ -50,7 +50,7 @@ impl<'a> BuiltFlow<'a> {
     }
 
     /// Serialize the IR as JSON.
-    #[cfg(feature = "runtime_support")]
+    #[cfg(feature = "viz")]
     pub fn ir_json(&self) -> Result<String, serde_json::Error> {
         super::ir::serialize_dedup_shared(|| serde_json::to_string_pretty(&self.ir))
     }
diff --git a/hydro_lang/src/viz/api.rs b/hydro_lang/src/viz/api.rs
index d9cdb3b41c52..39a9533109ed 100644
--- a/hydro_lang/src/viz/api.rs
+++ b/hydro_lang/src/viz/api.rs
@@ -40,6 +40,11 @@ impl<'a> GraphApi<'a> {
             crate::viz::config::GraphType::Mermaid => render_hydro_ir_mermaid(self.ir, config),
             crate::viz::config::GraphType::Dot => render_hydro_ir_dot(self.ir, config),
             crate::viz::config::GraphType::Json => render_hydro_ir_json(self.ir, config),
+            crate::viz::config::GraphType::Ir => {
+                crate::compile::ir::serialize_dedup_shared(|| {
+                    serde_json::to_string_pretty(self.ir).expect("failed to serialize IR")
+                })
+            }
         }
     }
 
diff --git a/hydro_lang/src/viz/config.rs b/hydro_lang/src/viz/config.rs
index cab480942b75..da5e8ae5e518 100644
--- a/hydro_lang/src/viz/config.rs
+++ b/hydro_lang/src/viz/config.rs
@@ -9,6 +9,8 @@ pub enum GraphType {
     Dot,
     /// JSON format for Hydroscope interactive viewer.
     Json,
+    /// Serialized IR JSON for standalone coordination analysis.
+    Ir,
 }
 
 impl GraphType {
@@ -18,6 +20,7 @@ impl GraphType {
             GraphType::Mermaid => "mmd",
             GraphType::Dot => "dot",
             GraphType::Json => "json",
+            GraphType::Ir => "ir.json",
         }
     }
 }