{
  "type": "array",
  "additionalProperties": false,
  "items": {
    "oneOf": [
      { "$ref": "#World" },
      { "$ref": "#Body" },
      { "$ref": "#Fixture" },
      { "$ref": "#Shape" },
      { "$ref": "#Joint" }
    ]
  },
  "definitions": {
    "ref": {
      "$id": "#Ref",
      "type": "object",
      "additionalProperties": false,
      "required": ["refIndex", "refType"],
      "properties": {
        "refIndex": { "type": "number" },
        "refType": { "type": "string", "enum": ["World", "Body", "Fixture", "Shape", "Joint"] }
      }
    },
    "World": {
      "$id": "#World",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "gravity": { "$ref": "#Vec2" },
        "bodies": {
          "type": "array",
          "items": { "$ref": "#Ref" }
        },
        "joints": {
          "type": "array",
          "items": { "$ref": "#Ref" }
        }
      }
    },
    "Body": {
      "$id": "#Body",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "type": { "type": "string", "enum": ["static", "dynamic", "kinematic"] },
        "bullet": { "type": "boolean" },
        "fixedRotation": { "type": "boolean" },
        "position": { "$ref": "#Vec2" },
        "angle": { "type": "number" },
        "linearVelocity": { "$ref": "#Vec2" },
        "angularVelocity": { "type": "number" },
        "fixtures": {
          "type": "array",
          "items": { "$ref": "#Ref" }
        }
      }
    },
    "Fixture": {
      "$id": "#Fixture",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "friction": { "type": "number" },
        "restitution": { "type": "number" },
        "density": { "type": "number" },
        "isSensor": { "type": "boolean" },
        "filterGroupIndex": { "type": "number" },
        "filterCategoryBits": { "type": "number" },
        "filterMaskBits": { "type": "number" },
        "shape": { "$ref": "#Ref" },
        "userData": { "type": "object" }
      }
    },
    "Shape": {
      "$id": "#Shape",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "type": { "type": "string", "enum": ["edge", "circle", "polygon", "chain", "box"] },
        "vertices": {
          "type": "array",
          "items": { "$ref": "#Vec2" }
        },
        "isLoop": { "type": "boolean" },
        "prevVertex": { "anyOf": [{ "$ref": "#Vec2" }, { "type": "null" }] },
        "nextVertex": { "anyOf": [{ "$ref": "#Vec2" }, { "type": "null" }] },
        "hasPrevVertex": { "type": "boolean" },
        "hasNextVertex": { "type": "boolean" },
        "vertex1": { "$ref": "#Vec2" },
        "vertex2": { "$ref": "#Vec2" },
        "vertex0": { "$ref": "#Vec2" },
        "vertex3": { "$ref": "#Vec2" },
        "hasVertex0": { "type": "boolean" },
        "hasVertex3": { "type": "boolean" },
        "p": { "$ref": "#Vec2" },
        "radius": { "type": "number" }
      }
    },
    "Joint": {
      "$id": "#Joint",
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "type": { "type": "string", "enum": [
          "distance-joint",
          "friction-joint",
          "motor-joint",
          "prismatic-joint",
          "revolute-joint",
          "weld-joint",
          "wheel-joint"
        ] },
        "bodyA": { "$ref": "#Ref" },
        "bodyB": { "$ref": "#Ref" },
        "collideConnected": { "type": "boolean" },
        "localAnchorA": { "$ref": "#Vec2" },
        "localAnchorB": { "$ref": "#Vec2" },
        "localAxis": { "$ref": "#Vec2" },
        "localAxisA": { "$ref": "#Vec2" },

        "frequencyHz": { "type": "number" },
        "dampingRatio": { "type": "number" },

        "length": { "type": "number" },

        "enableLimit": { "type": "boolean" },
        "lowerAngle": { "type": "number" },
        "upperAngle": { "type": "number" },
        "lowerTranslation": { "type": "number" },
        "upperTranslation": { "type": "number" },

        "enableMotor": { "type": "boolean" },
        "maxMotorTorque": { "type": "number" },
        "motorSpeed": { "type": "number" },
        "maxMotorForce": { "type": "number" },

        "referenceAngle": { "type": "number" },

        "angularOffset": { "type": "number" },
        "linearOffset": { "$ref": "#Vec2" },

        "correctionFactor": { "type": "number" },
        "maxForce": { "type": "number" },
        "maxTorque": { "type": "number" },

        "groundAnchorA": { "$ref": "#Vec2" },
        "groundAnchorB": { "$ref": "#Vec2" },
        "lengthA": { "type": "number" },
        "lengthB": { "type": "number" },
        "maxLength": { "type": "number" },
        "ratio": { "type": "number" },

        "impulse": { "type": "number" },
        "gamma": { "type": "number" },
        "bias": { "type": "number" }
      }
    },
    "Vec2": {
      "$id": "#Vec2",
      "type": "object",
      "additionalProperties": false,
      "required": ["x", "y"],
      "properties": {
        "x": { "type": "number" },
        "y": { "type": "number" }
      }
    }
  }
}