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const Ajv = require("ajv") const ajv = new Ajv({allErrors: true}) const schema = { type: "object", properties: { foo: {type: "string"}, bar: {type: "number", maximum: 3}, }, required: ["foo", "bar"], additionalProperties: false, } const validate = ajv.compile(schema) test({foo: "abc", bar: 2}) test({foo: 2, bar: 4}) function test(data) { const valid = validate(data) if (valid) console.log("Valid!") else console.log("Invalid: " + ajv.errorsText(validate.errors)) }

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ajv v8.1.0

Another JSON Schema Validator

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