"Do or do not. There is no try." - Yoda

🧘‍♂️600b validation library with custom handlers and messages.

• Installation
• Basic Usage
• Extras
  • Domain
  • Custom Error Messages

npm add yooda

import validator from 'yooda';

const requestBodySchema = {
	name: {
		type: 'string',
		required: true
	},
	age: {
		type: 'number',
		required: true
	}
};

const requestBody = {
	name: 'Ademola Adegbuyi',
	age: 23
};

try {
	const validate = validator(requestBodySchema);
	validate(requestBody);
} catch (err) {
	// Handle error properly
}

That's it, really. If the value doesn't meet the requirement, it throws an error and you can handle it as you want.

This is more like a plugin, to ensure some other personal requirements are met asides from the regular "required" and "type". We definitely cannot offer all kinds of edge-cases so we're giving you a buffet; Be your own boss, control the nature of the validation.

Here's how to use it:

const shouldStartWithA = value => value.startsWith('a');
// attach it to your schema
const requestBodySchema = {
	name: {
		type: 'string',
		required: true,
		domain: [shouldStartWithA]
	}
};
const validate = validator(requestBodySchema);
validate(requestBody);

The convention you decide to pick is up to you. In the test files, we have an object of domains with camel case names. Whatever works best for you!

You could define how errors will be thrown based on the supported error types (requiredError, typeError, and domainError), and it's very easy to use! A short example:

const schema: Schema = {
	age: {
		type: 'number',
		required: true,
		domain: [domains.IS_POSITIVE]
	}
};

const customErrorHandlers: CustomErrorHandlers = {
	domainError: ({ value, domain }) =>
		`${value} doesn't satify the ${domain} requirement`
};

const validate = validator(schema, customErrorHandlers);

Props available to the error types:

Note that: only the props required will be suggested to you via intellisense 🙏

type RequiredErrorProps = {
	key: string;
};

type TypeErrorProps = {
	key: string;
	type: string;
	value: any;
};

type DomainErrorProps = {
	key: string;
	type: string;
	value: any;
	domain: string;
};

MIT