JSON schema validator

[omar-bb]

JSON schema validator

• Validating JSON documents based on a JSON Schema
• (Check if the user's input matches program expectations in a simpler way and avoid if statements overload)

What other libraries (C++ or other) have this feature?

• f5-json-schema draft-07 (Boost Software License 1.0)
• JSON schema validator for JSON for Modern C++ draft-07 (MIT)
• Valijson draft-07 header-only library, works with many JSON parser implementations (BSD-2-Clause)

Include a code fragment with sample data that illustrates the use of this feature

• Understanding JSON Schema conventions

• Schema :

{
  "type": "object",
  "properties": {
    "first_name": { "type": "string" },
    "last_name": { "type": "string" },
    "birthday": { "type": "string", "format": "date" },
    "address": {
      "type": "object",
      "properties": {
        "street_address": { "type": "string" },
        "city": { "type": "string" },
        "state": { "type": "string" },
        "country": { "type" : "string" }
      }
    }
  }
}

• Would match this JSON document :

{
  "first_name": "George",
  "last_name": "Washington",
  "birthday": "22-02-1732",
  "address": {
    "street_address": "3200 Mount Vernon Memorial Highway",
    "city": "Mount Vernon",
    "state": "Virginia",
    "country": "United States"
  }
}

[danielaparker]

Okay, we'll add it to the list.

[danielaparker]

The jsonschema extension is now on master. Feedback appreciated.

[dineshkumar02]

@danielaparker ,

I am trying to use the JSON schema validator, by having the json schema is defined in another file, and referring the file,
and referring that file for the validation.

{
"title": "testing properties",
"type": "object",
"properties": {
"ReferenceToExternalSchema": {
"$ref": "other_file.json#/definitions/ExternalType"
}
}
}

The other_file.json is located in the same .cpp file, but while executing the code I am getting the below error.
Don't know how to load JSON Schema /other_file.json

Also, I have tested some other basic functionalities with the JSON schema validator, and it's working as expected.

[dineshkumar02]

I found the example, in the schema validator documentation.

https://github.com/danielaparker/jsoncons/blob/master/doc/ref/jsonschema/jsonschema.md

[danielaparker]

To resolve a reference to an external JSONSchema document, the jsoncons implementation needs a URIResolver provided. The error message "Don't know how to load JSON Schema" suggests you haven't provided one. Compare with the example
Using a URIResolver to resolve references to schemas defined in external files and make sure that make_schema is provided with a second argument,

auto sch = jsonschema::make_schema(schema, resolver);

[dineshkumar02]

Thanks @danielaparker