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To modify the field value in Firebase utilizing the Rest API, you need to perform a PATCH request to the specific endpoint of the field you want to modify. The data you send in the request body should contain the new value of the field or the fields you want to update, and it should be in JSON format. For example, if you want to modify the name field of a user with ID "1234", you would send a PATCH request to the endpoint https://your-project-id.firebaseio.com/users/1234.json, and the data in the request body would look like this:

{
  "name": "New Name"
}

This would update the name field of the user with ID "1234" to "New Name". Note that if you want to update multiple fields at once, you can include them all in the JSON data object.