# Implementing locking mechanism for SSR
In case you want to implement AB Tasty in a server-side rendering (SSR) environment, you might want to use our [locking mechanism](/client-side/tag/tag-methods-variables.md#locking-tag-execution) to prevent our tag from executing and modify the DOM **before** it fully loads, thus avoiding any reconciliation issues.
You will find here basic implementation examples for the three main JS frameworks and vanilla JS.
### Next JS
{% code title="\_document.tsx" fullWidth="false" %}
```javascript
import { Html, Head, Main, NextScript } from 'next/document';
export default function Document() {
return (
{/* Lock AB Tasty before tag loads */}
);
}
```
{% endcode %}
{% code title="\_app.tsx" %}
```javascript
import { useEffect } from 'react';
function MyApp({ Component, pageProps }) {
useEffect(() => {
const tryUnlockABTasty = () => {
if (typeof window?.unlockABTasty === 'function') {
window.unlockABTasty();
} else {
setTimeout(tryUnlockABTasty, 100);
}
};
tryUnlockABTasty();
}, []);
return ;
}
export default MyApp;
```
{% endcode %}
### Angular
{% code title="Index.html" %}
```javascript
```
{% endcode %}
{% code title="app.component.ts" %}
```javascript
import { AfterViewInit, Component } from '@angular/core';
@Component({
selector: 'app-root',
template: ``
})
export class AppComponent implements AfterViewInit {
ngAfterViewInit(): void {
const tryUnlockABTasty = () => {
if (typeof window.unlockABTasty === 'function') {
window.unlockABTasty();
} else {
setTimeout(tryUnlockABTasty, 100);
}
};
tryUnlockABTasty();
}
}
```
{% endcode %}
### VueJS
{% code title="nuxt.config.js" %}
```javascript
export default {
app: {
head: {
script: [
{ children: 'window.lockABTastyTag = true;' }
]
}
}
}
```
{% endcode %}
{% code title="App.vue" %}
```javascript
export default {
mounted() {
if (typeof window !== 'undefined' && window.unlockABTasty) {
window.unlockABTasty();
}
}
}
```
{% endcode %}
### Vanilla JS
{% code title="index.html" %}
```javascript
```
{% endcode %}
{% code title="script.js" %}
```javascript
window.addEventListener("DOMContentLoaded", function () {
if (typeof window.unlockABTasty === "function") {
window.unlockABTasty();
}
});
```
{% endcode %}
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