title: how do you create a joi schema to verify a json file format?
body: <p>If i had the below format for a json file which is supposed to model a chemistry experiment, how do i create a joy schema to validate the json file format? there are basic examples i've seen that cover the joi schema syntax for non-nested structures, but the one below is nested and i'm not sure how to format the joi schema. Any suggestions? </p>
  
  <pre><code>{
    "injection": {
      "volume": {
        "value": 20,
        "unit": "MicroLiter"
      },
      "number": 1,
      "location": {
        "vial": "1",
        "plate_row": "A",
        "plate_column": "1"
      }
  </code></pre>