Required fields for properties within an array of objects schema definition - json

Question

I have following schema definition. library is required. there can be many. so in that library object there are some other properties which is required. But though i use following code it is not validating. I mean book title is not required. title of the author is required.How can i fix this?
schema definition
{
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"required": ["library"],
"properties": {
"library": {
"type": "array",
"items": [
{"required":["title"],
"type": "object",
"properties": {
"title": {
"type": "string"
},
"author": {
"type": "string"
}
}
}
]
}}}
json input
{"library":[]
}
expected json input
{"library":[{"title":"Max"}]
}

Answer 1

I assume you want "json input" to fail.
If so, your problem is that you didn't describe a library with a book with missing title, Instead, your document says 'I am a library with no books'.
Failing JSON:
{"library":[{}]}
Alternately, if you want to probibit empty libraries: JSON Schema has a minLength property.

Answer 2

Your question is a little difficult to understand, but I noticed that you are using the tuple form of the items keyword. I'm sure that is not what you want. Try the following schema and I think it will behave the way you expect.
{
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"required": ["library"],
"properties": {
"library": {
"type": "array",
"items": {
"required": ["title"],
"type": "object",
"properties": {
"title": {
"type": "string"
},
"author": {
"type": "string"
}
}
}
}
}
}