First steps: JSON Schema validator

json.js

/*
Author: Esteban Castro Borsani
Licence: MIT
*/

/*
This is a schema validator... errrgh.... this is the first step to create a json validator.
It does not do any validation, but it iterates over nested objects and arrays defined in your schema, recording the full path for error outputs.

REQUIRES: lodash
*/



var schema = {
    "description": "A product from Acme's catalog",
    "type": "object",
    "properties": {
        "id": {
            required: true,
            "description": "The unique identifier for a product",
            "type": "integer"
        },
        "name": {
            "description": "Name of the product",
            "type": "string"
        },
        "tags": {
            required: true,
            "type": "array",
            "items": {
                "type": "string"
            }
        },
        "more": {
            "type": "object",
            "properties": {
                "id2222": {
                    "description": "The unique2222",
                    "type": "integer"
                },
                "name222": {
                    "description": "Name of the product 2222",
                    "type": "string"
                }
            }
        },
        "even_more": {
            "type": "array",
            "items": {
                "type": "object",
                "properties": {
                    "id333": {
                        "description": "The unique2222",
                        "type": "integer"
                    },
                    "name333": {
                        "description": "Name of the product 2222",
                        "type": "string"
                    }
                }
            }
        },
        "some_more": {
            "type": "array",
            "items": {
                "type": "string"
            }
        }
    }
};


var data = {
    bad: "nooooooooooooooo",
    id: "sup?",
    name: "wtf?",
    more: {
        id2222: "dang"
    },
    even_more: [
        {
            id333: 1111,
            name333: "zzzzzzzzzz"
        },
        {
            id333: 2222,
            name333: "yyyyyyyyyy"
        }
    ],
    some_more: ["aaa", "bbbb", "cccc"]
};


var nodePath = [];


function test(sch, data, opt) {
    console.log("------");

    opt = opt || {};

    if (opt.nodeName)
        nodePath.push(opt.nodeName);

    _.forOwn(sch, function(node, name) {
        if (typeof data[name] === 'undefined') {
            console.info("MISSING: " + nodePath.join(".") + "." + name);
            return;
        }

        console.log(nodePath.join(".") + "." + name);

        if (node.type == "object") {
            test(node.properties, data[name], {nodeName: name});
        }

        if (node.type == "array") {
            data[name].forEach(function(item, index) {
                var nodeObj = {};
                var itemObj = {};
                nodeObj[index] = node.items;
                itemObj[index] = item;
                test(nodeObj, itemObj, {nodeName: name});
            });
        }
    });

    if (opt.nodeName)
        nodePath.pop();

}

test({root: schema}, {root: data});


/*
OUTPUT

"------"
".root"
"------"
"root.name"
"MISSING: root.tags" test.js:122
"root.more"
"------"
"root.even_more"
"------"
"root.even_more.0"
"------"
"root.even_more.0.id333"
"root.even_more.0.name333"
"------"
"root.even_more.1"
"------"
"root.even_more.1.id333"
"root.even_more.1.name333"
"root.some_more"
"------"
"root.some_more.0"
"------"
"root.some_more.1"
"------"
"root.some_more.2"

*/