diff --git a/README.md b/README.md
index 9736a673..d58ac6dc 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ Make sure you have setup Rust environment (>= 1.64).
 
   - `yarn start run-block --endpoint=wss://acala-rpc-2.aca-api.network/ws`
   - This will replay the last block and print out the changed storages
+  - Use option `--output-path=<file_path>` to print out JSON file
 
 - Run a test node
   - `yarn start dev --endpoint=wss://acala-rpc-2.aca-api.network/ws`
diff --git a/src/index.ts b/src/index.ts
index a73fb345..eb40baef 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -9,6 +9,7 @@ import { TaskManager } from './task'
 import { createServer } from './server'
 import { defaultLogger } from './logger'
 import { handler } from './rpc'
+import { writeFileSync } from 'fs'
 
 const setup = async (argv: any) => {
   const port = argv.port || process.env.PORT || 8000
@@ -67,7 +68,13 @@ const runBlock = async (argv: any) => {
       wasm,
       calls,
     },
-    console.log
+    (output) => {
+      if (argv['output-path']) {
+        writeFileSync(argv['output-path'], JSON.stringify(output, null, 2))
+      } else {
+        console.dir(output, { depth: null, colors: false })
+      }
+    }
   )
 
   setTimeout(() => process.exit(0), 50)
@@ -96,6 +103,10 @@ yargs(hideBin(process.argv))
           desc: 'Command to execute the executor',
           string: true,
         },
+        'output-path': {
+          desc: 'File path to print output',
+          string: true,
+        },
       }),
     (argv) => {
       runBlock(argv).catch((err) => {