Put validation of two array fields in JSON Schema using oneOf - jsonschema

Question

Can I put check on two fields in JSON schema ? Both field are of type array of objects. Conditions:
Either one of them can contain value at a time (i.e. other should be empty).
Both can be empty.
Any leads ?
// The schema
var schema = {
"id": "https://kitoutapi.lrsdedicated.com/v1/json_schemas/login-request#",
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Login request schema",
"type": "object",
"oneOf": [
{ "categories": {
"maxItems": 0
},
"positionedOffers": {
"minItems": 1
}},
{ "categories": {
"minItems": 1
},
"positionedOffers": {
"maxItems": 0
}}
],
"properties": {
"categories": {
"type": "array"
},
"positionedOffers": {
"type": "array"
}
},
"additionalProperties": false
};
// Test data 1
// This test should return a good result
var data1 = {
"positionedOffers":['hello'],
"categories":[],
}

Answer 1

For your requirement, I think I'd come at this from the other direction. Rather than saying
If one contains a value, the other must be empty, but both may be empty.
I'd say
At least one must be empty.
That leads you to use an anyOf with subschemas checking that each property is an empty array.
{
"id": "https://kitoutapi.lrsdedicated.com/v1/json_schemas/login-request#",
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "Login request schema",
"type": "object",
"anyOf": [
{
"properties": {
"categories": {
"maxItems": 0
}
}
},
{
"properties": {
"positionedOffers": {
"maxItems": 0
}
}
}
],
"properties": {
"categories": {
"type": "array"
},
"positionedOffers": {
"type": "array"
}
},
"additionalProperties": false
}
Bonus Material
In your original post, you omitted the properties keywords under the oneOf. This may have been the cause of the schema's failure to validate. I've added it in the above.
Secondly, draft 4 is quite old at this point. You may be limited by the implementation you're using, but if you can, you should consider using a more recent version of JSON Schema. You can view available implementations and what versions they support on the JSON Schema implementations page.