diff --git a/package-lock.json b/package-lock.json
index 009392a..c3a5a44 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
       "dependencies": {
         "@codemirror/lang-javascript": "^6.1.1",
         "@codemirror/theme-one-dark": "^6.1.0",
+        "@gkucmierz/utils": "^1.12.1",
         "codemirror": "^6.0.1",
         "javascript-stringify": "^2.1.0",
         "normalize.css": "^8.0.1",
@@ -1869,6 +1870,11 @@
         "url": "https://opencollective.com/eslint"
       }
     },
+    "node_modules/@gkucmierz/utils": {
+      "version": "1.12.1",
+      "resolved": "https://registry.npmjs.org/@gkucmierz/utils/-/utils-1.12.1.tgz",
+      "integrity": "sha512-oP/4FMdP3h+fKh+Rpv3SB2F5K5DmOsMh4AuiKu8uWUtw1LkIy18JS7qzcKH0258iBg/zhXvhgcOI0LGuffsUCA=="
+    },
     "node_modules/@humanwhocodes/config-array": {
       "version": "0.11.6",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.11.6.tgz",
@@ -6841,6 +6847,11 @@
         "strip-json-comments": "^3.1.1"
       }
     },
+    "@gkucmierz/utils": {
+      "version": "1.12.1",
+      "resolved": "https://registry.npmjs.org/@gkucmierz/utils/-/utils-1.12.1.tgz",
+      "integrity": "sha512-oP/4FMdP3h+fKh+Rpv3SB2F5K5DmOsMh4AuiKu8uWUtw1LkIy18JS7qzcKH0258iBg/zhXvhgcOI0LGuffsUCA=="
+    },
     "@humanwhocodes/config-array": {
       "version": "0.11.6",
       "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.11.6.tgz",
diff --git a/package.json b/package.json
index bf4f940..03be835 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   "dependencies": {
     "@codemirror/lang-javascript": "^6.1.1",
     "@codemirror/theme-one-dark": "^6.1.0",
+    "@gkucmierz/utils": "^1.12.1",
     "codemirror": "^6.0.1",
     "javascript-stringify": "^2.1.0",
     "normalize.css": "^8.0.1",
diff --git a/src/file.worker.js b/src/file.worker.js
index fd56ab6..1320788 100644
--- a/src/file.worker.js
+++ b/src/file.worker.js
@@ -1,6 +1,7 @@
 
 import { stringify } from 'javascript-stringify';
 import { MAX_DATA_SIZE } from './app.config';
+import { getType } from '@gkucmierz/utils/src/get-type';
 
 const log = console.log;
 console.log = (...a) => l(a);
@@ -46,7 +47,10 @@ const throttledPM = (() => {
 })();
 
 const l = args => {
-  const data = args.map(el => stringify(el, null, '  ')).join(', ');
+  const data = args.map(el => stringify(el, (val, ind, str) => {
+    if (getType(val) === 'bigint') return `${val}n`;
+    return val;
+  }, '  ')).join(', ');
   throttledPM(data);
 };