The number type is a flexible data type used for storing numeric values. It can represent timestamps (milliseconds since epoch), simple numeric fields, or values used in comparisons. When used with the special default value $.now, it stores the current timestamp.
...
{
"schema": {
"title": {
"type": "string"
},
"publishedAt": {
"type": "number",
"default": "$.now"
},
"price": {
"type": "number"
},
"score": {
"type": "number",
"default": 100
}
}
}
...