Invalid JSON is accepted by validator.

[nosachamos]

I had the following JSON schema defined:
{
"description" : "Example Address JSON Schema",
"type" : "object",
"properties" : {
"address" : {
"title": "Street name and number",
"type" : "string"
},
"city" : {
"title" : "City name",
"type" : "string"
},
"postalCode" : {
"title" : "Zip Code: 2 letters dash five digits",
"type" : "string",
"pattern" : "^[A-Z]{2}-[0-9]{5}"
},
"region" : {
"title" : "Optional Region name",
"type" : "string",
"optional" : true
}
},
"additionalProperties" : false
}

Then I attempted to validate the following JSON, which is invalid since non-optional property "city" is missing:

{
"address" : "happy fake address"
}

But it accepted as valid.

[fge]

Erm, no, it is valid!

Your schema says, for address:

"address" : {
"title": "Street name and number",
"type" : "string"
}

Your address is a string.

If you want to make one or more properties required, add "required": true to the schema of these properties.

[fge]

BTW, which version do you use? and which version of JSON Schema, too? The optional keyword no longer exists.

[fge]

Closing. Referring to an obsolete schema version.

However, if you deem it important to support draft v2, I can manage that.