Trying to create a JSON schema, cannot figure out how to control that an object of type array contains sub-objects that must be a certain way. The thing is that I do not know how many sub objects I will have.
Oversimplified, I have this json:
{
"Fuses":[
{
"Foo": 80
},
{
"Foo": 20
}
]
}
If I generate a schema for this, either it hard-codes that there will be two sub-objects containing "Foo" or I just leave one like:
{
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"properties": {
"Fuses": {
"type": "array",
"items": [
{
"type": "object",
"properties": {
"Foo": {
"type": "integer"
}
},
"required": [
"Foo"
]
}
]
}
},
"required": [
"Fuses"
]
}
but then this would be valid, (which I do not want to):
{
"Fuses":[
{
"Foo": 80
},
{
"fooXYSCs": "whatever"
}
]
}
I want to allow "Fuses" to have as many sub-objects in the array as wanted, but each of them must be as "Foo": integer (and required obv).
Your issue is that your schema describe an array of exactly one element.
For example this:
{
"type": "array",
"items": [
{ "const": 42 }
]
}
Is the same as this:
{
"type": "array",
"minItems": 1,
"maxItems": 1,
"items": [
{ "const": 42 }
]
}
Which will validate this and only this array: [42]
If your array can contain zero or more elements of the same shape this is how I would do it:
{
"type": "array",
"items": {
"const": 42
}
}
Which would validate [], [42], [42, 42], [42, 42, 42], ... but not [42, 43] for example.
So to answer your question your schema should be:
{
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"properties": {
"Fuses": {
"type": "array",
"items": {
"type": "object",
"properties": {
"Foo": {
"type": "integer"
}
},
"required": [
"Foo"
]
}
}
},
"required": [
"Fuses"
]
}