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Schemas that can be converted to Yup and JSON Schema.

• Easy and understandable schema
• Contains ready regex patterns
• Portable schemas as a JSON file
• Works with Yup, stable and secure
• Schemas can be declared for TypeScript
• It is strict and therefore does not accept more than one type
• Error messages are ready to be understood but can be edited if desired
• Can be converted to Yup and JSON Schema. JSON Schema is OpenAPI compatible

You can install it as follows.

// NPM
npm install yuppi

// PNPM
pnpm install yuppi

// Yarn
yarn add yuppi

// Bun
bun add yuppi

// Deno
deno install npm:yuppi

Briefly as follows.

Yuppi
│
├── new Yuppi(options?)
│   │
│   ├── validate(schema, properties)
│   ├── declare(schema, name)
│   ├── convertToYup(schema)
│   └── convertToJSONSchema(schema)
│
├── Patterns
│   ├── Domain
│   ├── Email
│   ├── HTTP
│   ├── PhoneNumber
│   ├── URI
│   └── Username
│
├── type AnyObject
├── type JSONSchema
├── type Schema
├── type ValidateOptions
├── type ValidationError
└── type YuppiOptions

Briefly as follows.

import { Yuppi, Patterns } from 'yuppi';

new Yuppi(options?)

Yuppi schema builder.

Parameter	Default	Description
options	YuppiOptionsDefault	YuppiOptions (optional) Constructor's options.

Example:

const Yupp = new Yuppi();

Yuppi.validate(schema, properties)

Validate the properties with your Yuppi schema.

Parameter	Default	Description
schema		Schema Yuppi schema.
properties		AnyObject Properties to be validate.

returns AnyObject

Example:

const schema: Schema = {
  display_name: {
    type: 'string',
    max: 32,
    nullable: false,
    required: true
  },

  username: {
    type: 'string',
    min: 3,
    max: 16,
    pattern: Patterns.Username,
    nullable: false,
    required: true
  },

  email: {
    type: 'string',
    pattern: Patterns.Email,
    lowercase: true,
    nullable: false,
    required: true
  }
};

const properties = {
  display_name: 'Fırat',
  username: 'fir4tozden',
  email: 'fir4tozden@gmail.com'
};

try {
  Yupp.validate(schema, properties);
  /*
    {
      display_name: "Fırat",
      username: "fir4tozden",
      email: "fir4tozden@gmail.com"
    }
  */
} catch (error) {
  const errors = (error as ValidationError).errors;

  console.log(errors[0]); // "Field email must match the required pattern ^[a-zA-Z0-9._-]+@([a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,}$"
}

Yuppi.declare(schema, name)

Declare your Yuppi schema for TypeScript.

Parameter	Default	Description
schema		Schema Yuppi schema.
name		String Declaration name.

returns Void

Example:

import type { User } from './yuppi/types/User';

Yupp.declare(schema, 'User');

const user = Yupp.validate(schema, properties) as User;
/*
  interface User {
    display_name: string;
    username: string;
    email: string;
  }
*/

Yuppi.convertToYup(schema)

Convert your Yuppi schema into Yup schema.

Parameter	Default	Description
schema		Schema Yuppi schema.

returns AnyObject

Example:

Yupp.convertToYup(schema);

Yuppi.convertToJSONSchema(schema)

Convert your Yuppi schema into JSON Schema.

Parameter	Default	Description
schema		Schema Yuppi schema.

returns JSONSchema

Example:

Yupp.convertToJSONSchema(schema);
/*
  {
    type: "object",
    properties: {
      display_name: {
        type: "string",
        maxLength: 32,
      },
      username: {
        type: "string",
        minLength: 3,
        maxLength: 16,
        pattern: "^(?=.*[a-zA-Z])[a-zA-Z0-9][a-zA-Z0-9_]*$"
      },
      email: {
        type: "string",
        pattern: "^[a-zA-Z0-9._-]+@([a-zA-Z0-9-]+\\.)+[a-zA-Z]{2,}$",
      }
    },
    required: [
      "display_name",
      "username",
      "email"
    ],
    additionalProperties: false
  }
*/

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MIT License

Copyright (c) 2025 Keift

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.