根据 javascript 中的模式验证 json

Question

Question:

Is there a plain or native javascript way to validate a JSON script against a JSON schema?

I have found lots of libraries on Github, but no native/plain solution. Does EcmaScript not have a specification for this? and do none of the browsers (or nodejs) have a way to validate JSON natively?

Context of Question:

I have a very complex schema that I developed. It is supposed to work along with a script that requires that the JSON data passed into it to comply with the schema.

Answer 1

Simply, no.

There was something called JSON Schema , which was an Internet Draft which expired in 2013. Internet Drafts are the first stage to producing an Internet Standard . See more about it at the official site , as it seems to potentially still be actively developed, although it is not (to my knowledge) in widespread use.

An example of the schema:

{
  "$schema": "http://json-schema.org/schema#",
  "title": "Product",
  "type": "object",
  "required": ["id", "name", "price"],
  "properties": {
    "id": {
      "type": "number",
      "description": "Product identifier"
    },
    "name": {
      "type": "string",
      "description": "Name of the product"
    },
    "price": {
      "type": "number",
      "minimum": 0
    },
    "tags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "stock": {
      "type": "object",
      "properties": {
        "warehouse": {
          "type": "number"
        },
        "retail": {
          "type": "number"
        }
      }
    }
  }
}

will validate this example JSON:

{
  "id": 1,
  "name": "Foo",
  "price": 123,
  "tags": [
    "Bar",
    "Eek"
  ],
  "stock": {
    "warehouse": 300,
    "retail": 20
  }
}

EDIT As they all (more or less) do the same thing and have very similar syntaxes, performance should be of the biggest concern. See here for a comparison of JSON validator's performance - the winner is ajv , which is personally what I use for this reason.

Answer 2

There seems to be at least one pure JS solution now ( https://github.com/tdegrunt/jsonschema ) available via npm ( https://www.npmjs.com/package/jsonschema ). I am not a contributor, although I appreciate their work.