JSON Schema with unknown property names

Use patternProperties instead of properties. In the example below, the pattern match regex .* accepts any property name and I am allowing types of string or null only by using "additionalProperties": false.

  "patternProperties": {    "^.*$": {      "anyOf": [        {"type": "string"},        {"type": "null"}      ]    }  },  "additionalProperties": false

You can make constraints on properties not explicitly defined. The following schema enforces "meta" to be an array of objects whose properties are of type string:

{    "properties" : {        "meta" : {            "type" : "array",            "items" : {                "type" : "object",                "additionalProperties" : {                    "type" : "string"                }            }        }    }}

In case you just want to have an array of strings, you may use the following schema:

{    "properties" : {        "meta" : {            "type" : "array",            "items" : {                "type" : "string"            }        }    }}

The Solution of @jruizaranguren works for me. Though I am the same who defines the schema, i choosed another solution

"meta": {        "type": "array",        "items": {          "type": "array",          "items": {            "type": "object",            "properties": {              "name": {                "type": "string"              },              "value": {                "type": "string"              }            }          }        }      }

I converted the object to an array of name-value objectsAn example of a valid JSON:

"meta": [    [      {        "name": "http-equiv",        "value": "Content-Type"      },      {        "name": "content",        "value": "text/html; charset=UTF-8"      }    ],    [      {        "name": "name",        "value": "author"      },      {        "name": "content",        "value": "Astrid Florence Cassing"      }    ]  ]