"Missing '}' or object member name" error in Accommodation schema

Question

Could anyone advise why this schema below gets the following error:

Missing '}' or object member name.

<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": "Accommodation",
  "name" : "Le Hurel Cottage",
  "description" : "This cottage is one of 6 in a very large, newly converted, granite outbuilding on a traditional Jersey farmstead. It sleeps up to 6 adults, 1 child and 1 infant.",
  "address" : { "@type" : "PostalAddress",
           "addressCountry" : "Jersey",
           "addressLocality" : "Trinity",
           "postalCode" : "JE3 2GB",
             },
  "photo" : "TBC our image link",
  "numberOfRooms" : "3",
"LocationFeatureSpecification" : "Washing Machine",
"LocationFeatureSpecification" : "Wifi",
"LocationFeatureSpecification" : "Garden Patio",
"PetsAllowed" : "No",
}
</script>

Answer 1

In JSON, the last key:value pair before the closing bracket of either an object or an array should not be followed with a comma. Thus, you should delete the commas in the following two lines:

"postalCode" : "JE3 2GB"
"PetsAllowed" : "No"

There's more. Google won't recognize LocationFeatureSpecification for @type of Accommodation; you have to use something like amenityFeature. Also, you can combine those three values into an array, as Google will call out the usage of three separate lines of the same key.

This should return no errors:

<script type="application/ld+json">
{
  "@context": "http://schema.org",
  "@type": "Accommodation",
  "name" : "Le Hurel Cottage",
  "description" : "This cottage is one of 6 in a very large, newly converted, granite outbuilding on a traditional Jersey farmstead. It sleeps up to 6 adults, 1 child and 1 infant.",
  "address" : { "@type" : "PostalAddress",
           "addressCountry" : "Jersey",
           "addressLocality" : "Trinity",
           "postalCode" : "JE3 2GB"
             },
  "photo" : "TBC our image link",
  "numberOfRooms" : "3",
  "amenityFeature" : [
    "Washing Machine",
    "Wifi",
    "Garden Patio"
  ],
"PetsAllowed" : "No"
}
</script>

Answer 2

Basic Information about JSON format: JSON Syntax Rules

JSON syntax is derived from JavaScript object notation syntax:

• Data is in name/value pairs
• Data is separated by commas
• Curly braces hold objects
• Square brackets hold arrays

Advanced (all programming languages related) information about JSON format: JSON (JavaScript Object Notation)

JSON is built on two structures:

• A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
• An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.

If you still fail to understand how JSON format works?, use following online JSON validators.

• JSON Formatter
• Code Beautify
• JSON Formatter and Validator
• JSON Lint

As Henry mentioned your code has one extra comma at line

<script type="application/ld+json">
    {
      "@context": "http://schema.org",
      "@type": "Accommodation",
      "name": "Le Hurel Cottage",
      "description": "This cottage is one of 6 in a very large, newly converted, granite outbuilding on a traditional Jersey farmstead. It sleeps up to 6 adults, 1 child and 1 infant.",
      "address": {
        "@type": "PostalAddress",
        "addressCountry": "Jersey",
        "addressLocality": "Trinity",
        "postalCode": "JE3 2GB" // , <------------------ Extra comma, remove it.
      },
      "photo": "TBC our image link",
      "numberOfRooms": "3",
      "LocationFeatureSpecification": "Washing Machine",
      "LocationFeatureSpecification": "Wifi",
      "LocationFeatureSpecification": "Garden Patio",
      "PetsAllowed": "No"
    }
</script>