diff --git a/crates/moon/src/cli/run.rs b/crates/moon/src/cli/run.rs
index 89b2684b..66e66571 100644
--- a/crates/moon/src/cli/run.rs
+++ b/crates/moon/src/cli/run.rs
@@ -25,6 +25,7 @@ use moonutil::common::FileLock;
 use moonutil::common::RunMode;
 use moonutil::common::SurfaceTarget;
 use moonutil::common::TargetBackend;
+use moonutil::common::TestArtifacts;
 use moonutil::common::MOONBITLANG_CORE;
 use moonutil::common::MOON_PKG_JSON;
 use moonutil::common::{MoonbuildOpt, OutputFormat};
@@ -34,7 +35,6 @@ use moonutil::dirs::PackageDirs;
 use moonutil::mooncakes::sync::AutoSyncFlags;
 use moonutil::mooncakes::RegistryConfig;
 use n2::trace;
-use std::path::PathBuf;
 
 use super::{BuildFlags, UniversalFlags};
 
@@ -102,10 +102,9 @@ fn run_single_mbt_file(cli: &UniversalFlags, cmd: RunSubcommand) -> anyhow::Resu
         .join(format!("{}.core", file_name))
         .display()
         .to_string());
-    let output_wasm_or_js_path = &(output_artifact_path
-        .join(format!("{}.{}", file_name, target_backend.to_extension()))
-        .display()
-        .to_string());
+
+    let output_wasm_or_js_path =
+        output_artifact_path.join(format!("{}.{}", file_name, target_backend.to_extension()));
 
     let pkg_name = "moon/run/single";
     let build_package_command = [
@@ -133,7 +132,7 @@ fn run_single_mbt_file(cli: &UniversalFlags, cmd: RunSubcommand) -> anyhow::Resu
             .display()
             .to_string()),
         "-o",
-        output_wasm_or_js_path,
+        &output_wasm_or_js_path.display().to_string(),
         "-pkg-sources",
         &format!("{}:{}", pkg_name, mbt_file_parent_path.display()),
         "-pkg-sources",
@@ -156,7 +155,7 @@ fn run_single_mbt_file(cli: &UniversalFlags, cmd: RunSubcommand) -> anyhow::Resu
                 TargetBackend::Wasm | TargetBackend::WasmGC => "moonrun",
                 TargetBackend::Js => "node",
             };
-            println!("{runner} {output_wasm_or_js_path}");
+            println!("{} {}", runner, output_wasm_or_js_path.display());
         }
         return Ok(0);
     }
@@ -184,16 +183,18 @@ fn run_single_mbt_file(cli: &UniversalFlags, cmd: RunSubcommand) -> anyhow::Resu
     }
 
     if cmd.build_only {
+        let test_artifacts = TestArtifacts {
+            artifacts_path: vec![output_wasm_or_js_path],
+        };
+        println!("{}", serde_json_lenient::to_string(&test_artifacts)?);
         return Ok(0);
     }
 
     trace::scope("run", || match target_backend {
         TargetBackend::Wasm | TargetBackend::WasmGC => {
-            moonbuild::build::run_wat(&PathBuf::from(output_wasm_or_js_path), &cmd.args)
-        }
-        TargetBackend::Js => {
-            moonbuild::build::run_js(&PathBuf::from(output_wasm_or_js_path), &cmd.args)
+            moonbuild::build::run_wat(&output_wasm_or_js_path, &cmd.args)
         }
+        TargetBackend::Js => moonbuild::build::run_js(&output_wasm_or_js_path, &cmd.args),
     })?;
 
     Ok(0)
@@ -292,7 +293,13 @@ pub fn run_run_internal(cli: &UniversalFlags, cmd: RunSubcommand) -> anyhow::Res
         trace::open("trace.json").context("failed to open `trace.json`")?;
     }
 
-    let result = entry::run_run(&package_path, &moonc_opt, &moonbuild_opt, &module);
+    let result = entry::run_run(
+        &package_path,
+        &moonc_opt,
+        &moonbuild_opt,
+        &module,
+        cmd.build_only,
+    );
     if trace_flag {
         trace::close();
     }
diff --git a/crates/moon/src/cli/test.rs b/crates/moon/src/cli/test.rs
index 192e1170..f13ba052 100644
--- a/crates/moon/src/cli/test.rs
+++ b/crates/moon/src/cli/test.rs
@@ -343,6 +343,12 @@ fn do_run_test(
         auto_update,
         module,
     )?;
+
+    // don't print test summary if build_only
+    if build_only {
+        return Ok(0);
+    }
+
     let total = test_res.len();
     let passed = test_res.iter().filter(|r| r.is_ok()).count();
 
diff --git a/crates/moon/tests/test_cases/mod.rs b/crates/moon/tests/test_cases/mod.rs
index a3f303fd..5a0a423d 100644
--- a/crates/moon/tests/test_cases/mod.rs
+++ b/crates/moon/tests/test_cases/mod.rs
@@ -67,6 +67,18 @@ fn test_design() {
             main2
         "#]],
     );
+
+    get_stdout_with_args(&dir, ["clean"]);
+    check(
+        &get_stdout_with_args_and_replace_dir(
+            &dir,
+            ["run", "main2", "--target", "js", "--build-only"],
+        ),
+        expect![[r#"
+            {"artifacts_path":["$ROOT/target/js/release/build/main2/main2.js"]}
+        "#]],
+    );
+    assert!(dir.join("target/js/release/build/main2/main2.js").exists());
 }
 
 #[test]
@@ -5213,6 +5225,18 @@ fn test_moon_run_single_mbt_file() {
         "#]],
     );
 
+    let output = get_stdout_with_args_and_replace_dir(
+        &dir,
+        ["run", "a/b/single.mbt", "--target", "js", "--build-only"],
+    );
+    check(
+        &output,
+        expect![[r#"
+            {"artifacts_path":["$ROOT/a/b/target/single.js"]}
+        "#]],
+    );
+    assert!(dir.join("a/b/target/single.js").exists());
+
     let output = get_stdout_with_args_and_replace_dir(&dir, ["run", "a/b/single.mbt", "--dry-run"]);
     check(
         &output,
@@ -5572,6 +5596,19 @@ fn test_specify_source_dir_004() {
             Finished. moon: ran 3 tasks, now up to date
         "#]],
     );
+
+    get_stdout_with_args(&dir, ["clean"]);
+    check(
+        &get_stdout_with_args_and_replace_dir(
+            &dir,
+            ["run", "nes/t/ed/src/main", "--target", "js", "--build-only"],
+        ),
+        expect![[r#"
+            {"artifacts_path":["$ROOT/target/js/release/build/main/main.js"]}
+        "#]],
+    );
+    assert!(dir.join("target/js/release/build/main/main.js").exists());
+
     check(
         &get_stdout_with_args_and_replace_dir(&dir, ["run", "nes/t/ed/src/main"]),
         expect![[r#"
diff --git a/crates/moonbuild/src/entry.rs b/crates/moonbuild/src/entry.rs
index 8ab8b7c3..573d6d2d 100644
--- a/crates/moonbuild/src/entry.rs
+++ b/crates/moonbuild/src/entry.rs
@@ -34,7 +34,7 @@ use crate::check::normal::write_pkg_lst;
 use crate::expect::{apply_snapshot, render_snapshot_fail};
 use crate::runtest::TestStatistics;
 
-use moonutil::common::{MoonbuildOpt, MooncOpt, TargetBackend};
+use moonutil::common::{MoonbuildOpt, MooncOpt, TargetBackend, TestArtifacts};
 
 use std::sync::{Arc, Mutex};
 
@@ -196,6 +196,7 @@ pub fn run_run(
     moonc_opt: &MooncOpt,
     moonbuild_opt: &MoonbuildOpt,
     module: &ModuleDB,
+    build_only: bool,
 ) -> anyhow::Result<i32> {
     run_build(moonc_opt, moonbuild_opt, module)?;
     let (source_dir, target_dir) = (&moonbuild_opt.source_dir, &moonbuild_opt.target_dir);
@@ -242,6 +243,15 @@ pub fn run_run(
     ));
     let wat_path = dunce::canonicalize(&wat_path)
         .context(format!("cannot find wat file at `{:?}`", &wat_path))?;
+
+    if build_only {
+        let test_artifacts = TestArtifacts {
+            artifacts_path: vec![wat_path],
+        };
+        println!("{}", serde_json_lenient::to_string(&test_artifacts)?);
+        return Ok(0);
+    }
+
     trace::scope("run", || {
         if moonc_opt.link_opt.target_backend == TargetBackend::Wasm
             || moonc_opt.link_opt.target_backend == TargetBackend::WasmGC
@@ -315,10 +325,6 @@ pub fn run_test(
     let result = n2_run_interface(state, moonbuild_opt)?;
     render_result(result, moonbuild_opt.quiet, "testing")?;
 
-    if build_only {
-        return Ok(vec![]);
-    }
-
     let runtime = tokio::runtime::Builder::new_multi_thread()
         // todo: add config item
         .worker_threads(16)
@@ -333,6 +339,9 @@ pub fn run_test(
     let filter_index = test_opt.as_ref().and_then(|it| it.filter_index);
 
     let printed = Arc::new(AtomicBool::new(false));
+    let mut test_artifacts = TestArtifacts {
+        artifacts_path: vec![],
+    };
     for (pkgname, _) in module
         .packages
         .iter()
@@ -399,6 +408,11 @@ pub fn run_test(
                 );
 
                 std::fs::write(&wrapper_js_driver_path, js_driver)?;
+                test_artifacts
+                    .artifacts_path
+                    .push(wrapper_js_driver_path.clone());
+            } else {
+                test_artifacts.artifacts_path.push(artifact_path.clone());
             }
 
             let printed = Arc::clone(&printed);
@@ -443,6 +457,11 @@ pub fn run_test(
         }
     }
 
+    if build_only {
+        println!("{}", serde_json_lenient::to_string(&test_artifacts)?);
+        return Ok(vec![]);
+    }
+
     let res = if moonbuild_opt.no_parallelize {
         runtime.block_on(async {
             let mut results = vec![];
diff --git a/crates/moonutil/src/common.rs b/crates/moonutil/src/common.rs
index b458626d..42252996 100644
--- a/crates/moonutil/src/common.rs
+++ b/crates/moonutil/src/common.rs
@@ -385,6 +385,11 @@ impl TestOpt {
     }
 }
 
+#[derive(serde::Serialize, Clone)]
+pub struct TestArtifacts {
+    pub artifacts_path: Vec<PathBuf>,
+}
+
 #[derive(Debug, Clone, Default)]
 pub struct FmtOpt {
     pub check: bool,