diff --git a/src/cdp/cdp.zig b/src/cdp/cdp.zig
index d8647a4a..89f1bf3e 100644
--- a/src/cdp/cdp.zig
+++ b/src/cdp/cdp.zig
@@ -108,6 +108,23 @@ pub const State = struct {
 // Utils
 // -----
 
+pub fn dumpFile(
+    alloc: std.mem.Allocator,
+    id: u16,
+    script: []const u8,
+) !void {
+    const name = try std.fmt.allocPrint(alloc, "id_{d}.js", .{id});
+    defer alloc.free(name);
+    const dir = try std.fs.cwd().makeOpenPath("zig-cache/tmp", .{});
+    const f = try dir.createFile(name, .{});
+    defer f.close();
+    const nb = try f.write(script);
+    std.debug.assert(nb == script.len);
+    const p = try dir.realpathAlloc(alloc, name);
+    defer alloc.free(p);
+    std.log.debug("Script {d} saved at {s}", .{ id, p });
+}
+
 fn checkKey(key: []const u8, token: []const u8) !void {
     if (!std.mem.eql(u8, key, token)) return error.WrongToken;
 }
diff --git a/src/cdp/runtime.zig b/src/cdp/runtime.zig
index 985b2484..ab8afdea 100644
--- a/src/cdp/runtime.zig
+++ b/src/cdp/runtime.zig
@@ -134,16 +134,7 @@ fn evaluate(
     // save script in file at debug mode
     std.log.debug("script {d} length: {d}", .{ id, params.expression.len });
     if (std.log.defaultLogEnabled(.debug)) {
-        const name = try std.fmt.allocPrint(alloc, "id_{d}.js", .{id});
-        defer alloc.free(name);
-        const dir = try std.fs.cwd().makeOpenPath("zig-cache/tmp", .{});
-        const f = try dir.createFile(name, .{});
-        defer f.close();
-        const nb = try f.write(params.expression);
-        std.debug.assert(nb == params.expression.len);
-        const p = try dir.realpathAlloc(alloc, name);
-        defer alloc.free(p);
-        std.log.debug("Script {d} saved at {s}", .{ id, p });
+        try cdp.dumpFile(alloc, id, params.expression);
     }
 
     // evaluate the script in the context of the current page