I have implemented ajv to validate my mongodb schemas.
{
type: "object",
properties: { target: { type: "string" }, budget: { type: "number" } },
required: ["target", "budget"],
additionalProperties: false,
}
The snippet above represents the ajv schema for a specific document in my database. With additionalProperties: false, no extra properties are permitted.
My concern is how can I define a group of exceptional additional properties that should be allowed?
When defining properties in your schema, any property that is not marked as required is considered optional. These optional properties will be validated if they exist, but will be ignored if missing during data validation.
For example, consider validating an object with an optional maybeValue property:
const Ajv = require("ajv");
const ajv = new Ajv();
const schema = {
type: "object",
properties: {
goal: { type: "string" },
cost: { type: "number" },
maybeValue: { type: "string" },
},
required: ["goal", "cost"], // maybeValue is optional
additionalProperties: false,
};
const validate = ajv.compile(schema);
const valid = {
goal: 'win',
cost: 10,
};
// This schema is valid even though maybeValue is missing since it's optional
validate(valid);
const notValid = {
goal: 'win',
cost: 10,
maybeValue: 10
};
// This schema is not valid because maybeValue is not a string
validate(notValid);
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