The Object.freeze() method freezes an object for further use. We will not be able to change a frozen object. Once Object.freeze() is used on an object we will not be able to add a new property to it, we will not able to modify any existing property or even delete a property.
The Object.seal() method seals an object for further use. Once Object.seal() is used on an object we will not be able to add a new property to it, we will be able to modify any existing property but not delete a property.
The Object.preventExtensions() method prevents an object for further extension. Once Object.prevents() is used on an object we will not be able to add a new property to it, but will be able to modify any existing property and will be able to delete a property.
Following the table showing the comparison of above Object.freeze, Object.seal and Object.preventExtensions methods: