const inputBody = '{
  "type": "object",
  "required": [
    "brand",
    "hoseSize",
    "series"
  ],
  "properties": {
    "brand": {
      "type": "string",
      "description": "The brand of the item."
    },
    "hoseSize": {
      "type": "string",
      "description": "The dash size of the hose."
    },
    "series": {
      "type": "array",
      "description": "An array of series identifiers.",
      "items": {
        "type": "string",
        "description": "A series identifier."
      }
    }
  }
}';
const headers = {
  'Content-Type':'application/json',
  'Accept':'application/json'
};

fetch('https://goldleaf.app/api/v1/crimpfittings/sizes',
{
  method: 'POST',
  body: inputBody,
  headers: headers
})
.then(function(res) {
    return res.json();
}).then(function(body) {
    console.log(body);
});