diff --git a/src/puter-js/src/index.js b/src/puter-js/src/index.js
index 2120ae68a..9c9b47a8a 100644
--- a/src/puter-js/src/index.js
+++ b/src/puter-js/src/index.js
@@ -159,7 +159,7 @@ window.puter = (function() {
             logger = new putility.libs.log.CategorizedToggleLogger(
                 { delegate: logger });
             const cat_logger = logger;
-
+            
             // create facade for easy logging
             this.log = new putility.libs.log.LoggerFacade({
                 impl: logger,
@@ -248,6 +248,20 @@ window.puter = (function() {
                     console.error('Error accessing localStorage:', error);
                 }
             }
+
+            // Add prefix logger (needed to happen after modules are initialized)
+            (async () => {
+                const whoami = await this.auth.whoami();
+                logger = new putility.libs.log.PrefixLogger({
+                    delegate: logger,
+                    prefix: '[' +
+                        (whoami?.app_name ?? this.appInstanceID ?? 'HOST') +
+                        '] ',
+                });
+
+                this.log.impl = logger;
+            })();
+
         }
         
         registerModule (name, instance) {
diff --git a/src/putility/src/libs/log.js b/src/putility/src/libs/log.js
index 46846ce02..7fd5eb6f8 100644
--- a/src/putility/src/libs/log.js
+++ b/src/putility/src/libs/log.js
@@ -135,6 +135,30 @@ class ConsoleLogger extends AdvancedBase {
     }
 }
 
+class PrefixLogger extends AdvancedBase {
+    static PROPERTIES = {
+        prefix: {
+            construct: true,
+            value: ''
+        },
+        delegate: {
+            construct: true,
+            value: null,
+            adapt: v => AS(v, TLogger),
+        }
+    }
+    static IMPLEMENTS = {
+        [TLogger]: {
+            log (level, message, fields, values) {
+                return this.delegate.log(
+                    level, this.prefix + message,
+                    fields, values
+                );
+            }
+        }
+    }
+}
+
 class FieldsLogger extends AdvancedBase {
     static PROPERTIES = {
         fields: {
@@ -210,6 +234,7 @@ module.exports = {
     CategorizedToggleLogger,
     ToggleLogger,
     ConsoleLogger,
+    PrefixLogger,
     FieldsLogger,
     LoggerFacade,
 };