Juniper Validator

Validate data against a Juniper schema, and narrow it to the schema's type.

import { objectSchema, stringSchema } from 'juniper';
import { makeValidator } from 'juniper-validator';

const userSchema = objectSchema({
    properties: {
        name: stringSchema({ minLength: 1 }),
        email: stringSchema({ format: 'email' }),
    },
    required: ['name'],
    additionalProperties: false,
});

const validator = makeValidator(userSchema);

if (validator.is(input)) {
    console.log(input);
                
const input: {
    name: string;
    email?: string;
}
}

Get started →

Features

• Typed by the schema: is() and assert() narrow unknown to the schema's TypeScript type, with no type to write by hand.
• Standard Schema: Works with any library that accepts Standard Schema validators, such as form libraries and API frameworks. See Standard Schema.
• Strict Ajv underneath: Compiles with Ajv in strict mode, and validates standard formats like email, uuid and date-time.
• Any JSON Schema: Takes a Juniper schema, or a rendered JSON Schema object.