Fortify Schema

The Future of TypeScript Validation

What if schema validation looked exactly like TypeScript interfaces? Fortify Schema brings tomorrow's validation patterns to today's TypeScript developers. We're not competing with existing libraries - we're showing what validation will look like in 2025.

Interface-native syntax. Revolutionary conditional validation. Perfect TypeScript integration.

Documentation Navigation

Resource	Description
Complete Documentation	Full documentation index with organized sections
Conditional Validation Guide	World-class conditional validation with 20+ operators
Quick Reference	Cheat sheet for common patterns and syntax
Field Types Reference	Comprehensive guide to all available types and constraints
Real-World Examples	Production-ready schemas for enterprise use
Migration Guide	Step-by-step migration from Zod, Joi, Yup
Quick Start	Get up and running in 5 minutes
Schema Transformation	Transform and combine schemas with Mod utilities

---

The Evolution of TypeScript Validation

2020-2023: Method Chaining Era

// Traditional libraries (Zod, Joi, Yup)
z.object({
  name: z.string().min(2).max(50),
  role: z.enum(["admin", "user"]),
  permissions: z.array(z.string()).optional(),
});

2024+: Interface Era (Fortify Schema)

// The future of validation
Interface({
  name: "string(2,50)",
  role: "admin|user",
  permissions: "when role=admin *? string[] : string[]?",
});

The difference? 70% less code, perfect TypeScript alignment, and conditional validation that actually works.

Fortify Schema isn't just another validation library - it's the evolution of how we think about data validation in TypeScript. We bring interface-native syntax to runtime validation, making schemas that look and feel exactly like TypeScript interfaces while providing revolutionary conditional validation capabilities.

Key Features

Advanced Conditional Validation

• 20+ operators for comparison, pattern matching, and logical operations
• TypeScript inference - IDE understands conditional types
• Nested conditions - Multi-level conditional logic support
• Business rule modeling - Express complex domain logic naturally

Developer Experience

• Interface-like syntax familiar to TypeScript developers
• Type inference reduces manual type definitions
• Compile-time validation catches errors early
• Rich IDE support with autocomplete and error detection

Performance & Reliability

• Optimized validation - Efficient parsing and evaluation
• Caching system - Reuses parsed expressions
• Memory efficient - Minimal runtime overhead
• Comprehensive testing - Extensive test suite coverage

Early Access to the Future

Current Status: Revolutionary Beta

Fortify Schema represents the next generation of TypeScript validation. While established libraries serve today's needs, we're building tomorrow's validation patterns.

Perfect for Forward-Thinking Teams:

• Innovation projects: Teams exploring cutting-edge TypeScript patterns
• Greenfield applications: New projects that can benefit from modern validation approaches
• Complex business logic: Applications requiring sophisticated conditional validation
• TypeScript enthusiasts: Developers who want validation that feels native to TypeScript

When to Consider Established Libraries:

• Legacy system integration: When extensive ecosystem compatibility is required
• Risk-averse environments: Teams preferring battle-tested solutions
• Simple validation needs: Basic schemas without conditional logic

The Trade-off: Choose between today's proven patterns or tomorrow's revolutionary approach. Early adopters of jQuery (2005), React (2013), and TypeScript (2017) gained significant competitive advantages. Fortify Schema offers the same opportunity for validation.

---

Library Comparison Overview

See why developers are migrating to Fortify Schema from traditional validation libraries:

Code Comparison

Traditional Libraries	Fortify Schema	Reduction
Zod	Fortify Schema	70% Less Code
z.number().int().positive()	"positive"	24 → 10 chars
z.string().min(2).max(50)	"string(2,50)"	25 → 15 chars
z.array(z.string()).min(1).max(10)	"string[](1,10)"	33 → 17 chars
z.enum(["active", "inactive"])	"active|inactive"	31 → 17 chars
z.string().optional()	"string?"	21 → 9 chars

Real-World Schema Comparison

Traditional Approach (Zod):

import { z } from "zod";

const UserSchema = z.object({
  id: z.number().int().positive(),
  email: z.string().email(),
  name: z.string().min(2).max(50),
  age: z.number().int().min(18).max(120).optional(),
  tags: z.array(z.string()).min(1).max(10).optional(),
  status: z.enum(["active", "inactive", "pending"]),
  role: z.literal("admin"),
});
// 8 lines, 312 characters, complex method chaining

Fortify Schema Approach:

import { Interface } from "fortify-schema";

const UserSchema = Interface({
  id: "positive",
  email: "email",
  name: "string(2,50)",
  age: "int(18,120)?",
  tags: "string[](1,10)?",
  status: "active|inactive|pending",
  role: "admin|user",
});
// 8 lines, 156 characters, TypeScript-like syntax

Result: 50% fewer characters, zero learning curve, perfect type inference

Conditional Validation

Problem with Existing Libraries:

// Zod - Requires complex workarounds
const schema = z
  .object({
    role: z.enum(["admin", "user"]),
    permissions: z.array(z.string()).optional(),
  })
  .refine(
    (data) => {
      if (data.role === "admin" && !data.permissions) {
        return false;
      }
      return true;
    },
    { message: "Admin users must have permissions" }
  );

Fortify Schema Solution:

// Enterprise user management with advanced conditional validation
const EnterpriseUserSchema = Interface({
  // Core user information
  id: "uuid",
  email: "email",
  role: "admin|manager|employee|contractor|guest",
  department: "engineering|sales|marketing|hr|finance",
  accountType: "enterprise|professional|standard|trial",

  // Conditional permissions based on role and account type
  systemPermissions: "when role.in(admin,manager) *? string[] : string[]?",

  // Department access (managers get elevated access)
  departmentAccess:
    "when role=manager *? string[] : when role=admin *? string[] : =[]",

  // Account features based on type and role
  maxProjects:
    "when accountType=trial *? =3 : when accountType=standard *? =10 : when accountType=professional *? =50 : =unlimited",

  // Advanced features for enterprise accounts
  apiAccess: "when accountType.in(professional,enterprise) *? boolean : =false",
  customIntegrations: "when accountType=enterprise *? boolean : =false",

  // Security requirements
  mfaRequired:
    "when role.in(admin,manager) *? =true : when accountType=enterprise *? =true : boolean",

  // Nested conditional validation
  profile: {
    firstName: "string(1,50)",
    lastName: "string(1,50)",

    // Manager-specific fields
    teamSize: "when role.in(manager,admin) *? int(1,) : int?",
    directReports: "when role.in(manager,admin) *? string[] : string[]?",
  },
});

// Perfect TypeScript inference - IDE knows exact types based on conditions
const result = EnterpriseUserSchema.safeParse(userData);
if (result.success) {
  // TypeScript knows systemPermissions is string[] for admin/manager, string[]? for others
  // TypeScript knows maxProjects is "unlimited" for enterprise, number for others
  // TypeScript knows profile.teamSize is number for admin/manager, number? for others
}

Complete Migration Guide - Detailed comparisons and migration strategies

Why Developers Choose Fortify Schema

Dramatic Simplification

• Up to 70% reduction in schema definition code
• TypeScript interface-like syntax developers already know
• Single import for most validation scenarios

Superior Type Safety

• Exact literal types instead of generic unions
• Perfect IDE integration with autocomplete and error detection

Enterprise Performance

• Optimized validation algorithms
• Tree-shakable architecture for minimal bundle impact
• Zero runtime type overhead

---

The Fortify Schema Solution

Clean, Intuitive Syntax

import { Interface } from "fortify-schema";

const UserSchema = Interface({
  id: "number",
  email: "email",
  name: "string(2,50)", // Length constraints
  age: "number(18,120)?", // Range with optional
  tags: "string[](1,10)?", // Array constraints
  status: "active|inactive", // Union types - pure TypeScript syntax!
  role: "=admin", // Literal constants - use =value syntax
});

Advanced Type Inference

const result = UserSchema.safeParse(userData);

if (result.success && result.data) {
  // Perfect type inference - no manual definitions needed
  result.data.status; // "active" | "inactive" (exact union!)
  result.data.role; // "admin" (exact literal!)
  result.data.age; // number | undefined (perfect optionals!)
}

// Compile-time safety prevents runtime errors
UserSchema.safeParse({
  id: 1,
  name: "John",
  invalidProp: "error", // ❌ TypeScript ERROR caught at compile time
});

Conditional Validation with Perfect Type Inference

The world's first schema library with conditional validation that provides complete TypeScript inference support

const UserSchema = Interface({
  role: "admin|user|guest",
  accountType: "free|premium|enterprise",

  // Advanced conditional syntax - Crystal clear, no confusion
  permissions: "when role=admin *? string[] : string[]?",
  maxProjects: "when accountType=free *? int(1,3) : int(1,)",
  paymentMethod: "when accountType!=free *? string : string?",
  billingAddress: "when paymentMethod.exists *? string : string?",
});

// TypeScript knows the EXACT type based on conditions
const adminUser = {
  role: "=admin" as const,
  permissions: ["read", "write", "delete"], // ✅ TypeScript: string[]
  maxProjects: 100, // ✅ TypeScript: number
  paymentMethod: "credit_card", // ✅ TypeScript: string
};

const regularUser = {
  role: "=user" as const,
  accountType: "free" as const,
  maxProjects: 2, // ✅ TypeScript: number (1-3 range)
  // permissions not allowed for regular users
  // paymentMethod not required for free users
};

// TypeScript catches conditional type mismatches at compile time
const invalidUser = {
  role: "=user" as const,
  permissions: ["read", 2], // ❌ TypeScript ERROR: Type 'number' is not assignable to type 'string'
};

Three Approaches Available:

1. Advanced Conditional Syntax (Crystal clear + Perfect TypeScript inference)
2. Parentheses Syntax (Clear structure, runtime only)
3. Import-based Syntax (Fluent API, most powerful)

import { When } from 'fortify-schema';

// Advanced conditional syntax (Recommended - Full TypeScript support)
permissions: "when role=admin *? string[] : string[]?",

// Parentheses syntax (Runtime validation only - limited TypeScript inference)
permissions: "when(role=admin) then(string[]) else(string[]?)",

// Import-based syntax (Full TypeScript support)
permissions: When.field("role").is("admin").then("string[]").else("string[]?")

Why the conditional syntax is powerful:

• Crystal clear boundaries: Easy to see where condition ends and logic begins
• Perfect TypeScript inference: Full compile-time type checking
• No conflicts: Doesn't interfere with optional ? operator
• Intuitive: Reads like natural language
• Professional: Clean and elegant syntax

Note: The parentheses syntax works perfectly at runtime but has limited TypeScript inference due to nested parentheses in template literal types. Use the *? syntax for the best developer experience.

---

Installation

npm install fortify-schema

Requirements:

• TypeScript 4.5+
• Node.js 14+

---

Quick Start Guide

Basic Schema Definition

import { Interface } from "fortify-schema";

// Define your schema like a TypeScript interface
const UserSchema = Interface({
  id: "number",
  email: "email",
  name: "string",
  age: "number?", // Optional field
  isActive: "boolean?",
  tags: "string[]?", // Optional array
  status: "active|inactive|pending", // Union types - TypeScript syntax!
  role: "=user", // Literal constants - use =value syntax
});

Schema Transformation

import { Mod } from "fortify-schema";

// Create variations of your schema
const PublicUserSchema = Mod.omit(UserSchema, ["password"]);
const PartialUserSchema = Mod.partial(UserSchema);
const ExtendedSchema = Mod.extend(UserSchema, {
  createdAt: "date",
  lastLogin: "date?",
});

Data Validation

// Strict validation (recommended for application code)
const result = UserSchema.safeParse(userData);

if (result.success) {
  console.log("✅ Valid user:", result.data);
  // result.data is perfectly typed with exact inference
} else {
  console.log("❌ Validation errors:", result.errors);
}

// Flexible validation (for external/unknown data)
const unknownResult = UserSchema.safeParseUnknown(apiResponse);

---

Core Concepts

Field Types

Complete Field Types Reference - Comprehensive guide to all available types and constraints

Basic Types

{
  name: "string",           // String validation
  age: "number",            // Number validation
  active: "boolean",        // Boolean validation
  created: "date",          // Date validation
  data: "any"               // Any type (no validation)
}

Optional Fields

{
  name: "string",           // Required field
  age: "number?",           // Optional field
  bio: "string?",
  tags: "string[]?"         // Optional array
}

Format Validation

{
  email: "email",           // Email format validation
  website: "url",           // URL format validation
  id: "uuid",               // UUID format validation
  phone: "phone",           // Phone number format
  slug: "slug",             // URL slug format
  username: "username"      // Username format rules
}

Array Types

{
  tags: "string[]",         // Array of strings
  scores: "number[]",       // Array of numbers
  flags: "boolean[]",       // Array of booleans
  emails: "email[]"         // Array of validated emails
}

Advanced Type Definitions

Constants and Unions

import { Make } from 'fortify-schema';

{
  // Safe constants (explicit and unambiguous)
  version: Make.const("1.0"),
  status: Make.const(200),

  // Union types (multiple allowed values)
  priority: Make.union("low", "medium", "high"),
  role: Make.unionOptional("user", "admin", "moderator")
}

Why use Make? It eliminates ambiguity between type specifications and constant values, making schemas more readable and maintainable.

Conditional Validation

Fortify Schema provides the first conditional validation system with complete TypeScript inference:

Advanced Conditional Syntax (Recommended)

{
  role: "admin|user|guest",

  // Advanced conditional syntax - Crystal clear
  permissions: "when role=admin *? string[] : string[]?",

  // Multiple conditions with different operators
  maxProjects: "when accountType=free *? int(1,3) : int(1,)",
  paymentMethod: "when accountType!=free *? string : string?",

  // Existence-based conditions
  billingAddress: "when paymentMethod.exists *? string : string?",

  // Numeric comparisons
  seniorDiscount: "when age>=65 *? number : number?",

  // Array inclusion checks
  adminFeatures: "when role.in(admin,moderator) *? string[] : string[]?"
}

Parentheses Syntax (Also Clear)

{
  role: "admin|user|guest",
  permissions: "when(role=admin) then(string[]) else(string[]?)",
  maxProjects: "when(accountType=free) then(int(1,3)) else(int(1,))",
  paymentMethod: "when(accountType!=free) then(string) else(string?)"
}

Import-based Conditional Validation (Most Powerful)

import { When } from 'fortify-schema';

{
  role: "admin|user|guest",
  permissions: When.field("role").is("admin").then("string[]").else("string[]?"),
  maxProjects: When.field("accountType").is("free").then("int(1,3)").else("int(1,)"),
  paymentMethod: When.field("accountType").isNot("free").then("string").else("string?")
}

Conditional Syntax Reference

Syntax	Description	Example
Advanced Conditional Syntax
"when condition *? then : else"	Crystal clear syntax	"when role=admin *? string[] : string[]?"
"when condition *? then"	Only when condition	"when role=admin *? string[]"
Parentheses Syntax
"when(condition) then(schema) else(schema)"	Explicit structure	"when(role=admin) then(string[]) else(string[]?)"
Legacy Syntax (Still supported but not recommended)
"when:field=value:then:else"	Legacy format	"when:role=admin:string[]:string[]?"

Condition Operators:

Comparison Operators:

• = - Equality: "when role=admin *? ..."
• != - Not equal: "when status!=pending *? ..."
• >, >= - Greater than: "when age>=18 *? ..."
• <, <= - Less than: "when score<50 *? ..."

Pattern Operators:

• ~ - Regex match: "when email~^admin *? ..."
• !~ - Negative regex: "when email!~@temp *? ..."

Existence Operators:

• .exists - Field exists: "when email.exists *? ..."
• .!exists - Field does not exist: "when email.!exists *? ..."

State Operators:

• .empty - Field is empty: "when description.empty *? ..."
• .!empty - Field is not empty: "when tags.!empty *? ..."
• .null - Field is null: "when optional.null *? ..."
• .!null - Field is not null: "when required.!null *? ..."

Array Operators:

• .in(a,b,c) - Value in array: "when role.in(admin,mod) *? ..."
• .!in(a,b,c) - Value not in array: "when role.!in(guest) *? ..."

String Operators:

• .startsWith(value) - String starts with: "when filename.startsWith(temp_) *? ..."
• .endsWith(value) - String ends with: "when filename.endsWith(.tmp) *? ..."
• .contains(value) - String contains: "when path.contains(/secure/) *? ..."
• .!contains(value) - String does not contain: "when path.!contains(/temp/) *? ..."

Benefits of the *? syntax:

• No confusion with optional ? operator
• Crystal clear where condition ends and logic begins
• Natural language flow that's easy to read

Complete TypeScript Integration:

• ✅ Compile-time type checking for conditional fields
• ✅ Exact type inference based on conditions
• ✅ IDE autocomplete and error detection
• ✅ Runtime validation with full data context

---

Constraint System

String Constraints

{
  username: "string(3,20)",        // 3-20 characters
  password: "string(8,)",          // Minimum 8 characters
  bio: "string(,500)?",            // Maximum 500 characters, optional
  title: "string(10,100)",         // Exactly 10-100 characters
}

Number Constraints

{
  age: "number(18,120)",           // Age range 18-120
  score: "number(0,100)",          // Score 0-100
  price: "number(0.01,999.99)",    // Price with decimal precision
  rating: "number(1,5)?",          // Rating 1-5, optional
}

Array Constraints

{
  tags: "string[](1,10)?",         // 1-10 string items, optional
  scores: "number[](3,5)",         // Exactly 3-5 number items
  items: "any[](1,)",              // At least 1 item
  emails: "email[](,20)",          // Maximum 20 email addresses
}

Pattern Validation

{
  slug: "string(/^[a-z0-9-]+$/)",           // URL slug pattern
  phone: "string(/^\\+?[1-9]\\d{1,14}$/)", // International phone
  code: "string(/^[A-Z]{2,4}$/)",          // Uppercase code pattern
  hexColor: "string(/^#[0-9a-fA-F]{6}$/)", // Hex color validation
}

Constraint Reference Table

Syntax	Description	Example
"string(min,max)"	Length constraints	"string(3,20)"
"string(min,)"	Minimum length only	"string(8,)"
"string(,max)"	Maximum length only	"string(,100)"
"string(/regex/)"	Pattern validation	"string(/^[a-z]+$/)"
"number(min,max)"	Value range	"number(0,100)"
"type[](min,max)"	Array size constraints	"string[](1,10)"
"type?"	Optional field	"string?"

---

Schema Transformation with Mod

The Mod utility provides powerful schema transformation capabilities:

Combining Schemas

const UserSchema = Interface({ id: "number", name: "string" });
const ProfileSchema = Interface({ bio: "string?", avatar: "url?" });

// Merge multiple schemas
const CompleteSchema = Mod.merge(UserSchema, ProfileSchema);

Selecting Fields

const UserSchema = Interface({
  id: "number",
  name: "string",
  email: "email",
  password: "string",
  createdAt: "date",
});

// Pick specific fields
const PublicSchema = Mod.pick(UserSchema, ["id", "name", "email"]);

// Omit sensitive fields
const SafeSchema = Mod.omit(UserSchema, ["password"]);

Modifying Field Requirements

// Make all fields optional
const PartialSchema = Mod.partial(UserSchema);

// Make all fields required
const RequiredSchema = Mod.required(OptionalSchema);

// Extend with new fields
const ExtendedSchema = Mod.extend(UserSchema, {
  lastLogin: "date?",
  isVerified: "boolean",
});

Complex Transformations

// Chain multiple transformations
const APIResponseSchema = Mod.extend(
  Mod.omit(Mod.merge(UserSchema, ProfileSchema), ["password", "internalId"]),
  {
    metadata: {
      version: Make.const("2.0"),
      timestamp: "date",
    },
  }
);

---

Validation Modes

Strict Mode (Default)

Fortify Schema is strict by default, respecting exactly what you specify:

const schema = Interface({
  id: "number",
  name: "string",
});

// This fails - string "1" is not a number
const result = schema.safeParse({
  id: "1", // Type mismatch
  name: "John",
});
// result.success === false

Loose Mode (Type Coercion)

Enable automatic type conversion when needed:

const looseSchema = Interface({
  id: "number",
  active: "boolean",
}).loose();

// This succeeds with automatic conversion
const result = looseSchema.safeParse({
  id: "123", // Converted to number
  active: "true", // Converted to boolean
});

console.log(result.success); // true
console.log(result.data); // { id: 123, active: true }
console.log(result.warnings); // Conversion warnings

Strict Object Mode

Prevent additional properties:

const strictSchema = Interface({
  id: "number",
  name: "string",
}).strict();

// Fails due to extra property
const result = strictSchema.safeParse({
  id: 1,
  name: "John",
  age: 25, // Not allowed in strict mode
});

---

Validation Methods

Parse Methods

// parse() - Throws on validation failure
try {
  const user = UserSchema.parse(userData);
  // user is fully typed and validated
} catch (error) {
  console.error("Validation failed:", error.message);
}

// safeParse() - Returns result object (recommended)
const result = UserSchema.safeParse(userData);
if (result.success) {
  console.log("Valid data:", result.data);
} else {
  console.log("Errors:", result.errors);
}

// safeParseUnknown() - For dynamic/unknown data
const unknownResult = UserSchema.safeParseUnknown(apiResponse);

Result Structure

// Success result
{
  success: true,
  data: T,           // Fully typed validated data
  errors: [],
  warnings: string[] // Type coercion warnings in loose mode
}

// Error result
{
  success: false,
  data: null,
  errors: string[],  // Detailed error messages
  warnings: string[]
}

---

Real-World Examples

User Management System

const UserSchema = Interface({
  // Basic identification
  id: "uuid",
  email: "email",
  username: "string(3,20)",

  // Security
  password: "string(8,)", // Minimum 8 characters
  role: Make.union("user", "moderator", "admin"),
  status: Make.union("active", "inactive", "suspended"),

  // Profile information
  profile: {
    firstName: "string(1,50)",
    lastName: "string(1,50)",
    avatar: "url?",
    bio: "string(,500)?", // Optional bio, max 500 chars
    dateOfBirth: "date?",
  },

  // Constraints and metadata
  age: "number(13,120)?", // Age verification
  tags: "string[](1,10)?", // User tags, 1-10 items
  permissions: "string[](,20)?", // Max 20 permissions

  // Timestamps
  createdAt: "date",
  lastLogin: "date?",

  // Application-specific
  accountType: Make.const("standard"),
  preferences: {
    theme: Make.union("light", "dark", "auto"),
    notifications: "boolean",
    language: "string(/^[a-z]{2}$/)", // ISO language code
  },
});

API Response Schema

const APIResponseSchema = Interface({
  // Response metadata
  version: Make.const("2.0"),
  timestamp: "date",
  requestId: "uuid",

  // Response status
  status: Make.union("success", "error", "partial"),
  statusCode: "number(100,599)",

  // Dynamic content
  data: "any?",
  errors: "string[]?",
  warnings: "string[]?",

  // Pagination (for list responses)
  pagination: {
    page: "number(1,)",
    limit: "number(1,100)",
    total: "number(0,)",
    hasMore: "boolean"
  }?,

  // Environment context
  meta: {
    environment: Make.union("development", "staging", "production"),
    region: "string(/^[a-z]{2}-[a-z]+-\\d$/)", // AWS region format
    cached: "boolean?",
    ttl: "number(0,)?"
  }
});

E-commerce Product Schema

const ProductSchema = Interface({
  // Product identification
  id: "uuid",
  sku: "string(/^[A-Z0-9-]{6,20}$/)",
  name: "string(1,200)",
  slug: "string(/^[a-z0-9-]+$/)",

  // Categorization
  category: "string",
  subcategory: "string?",
  tags: "string[](,20)",

  // Pricing
  price: "number(0.01,99999.99)",
  originalPrice: "number(0.01,99999.99)?",
  currency: "string(/^[A-Z]{3}$/)",           // ISO currency code

  // Inventory
  stock: "number(0,)",
  stockStatus: Make.union("in-stock", "low-stock", "out-of-stock"),

  // Product details
  description: "string(,5000)",
  shortDescription: "string(,500)?",
  specifications: "any?",                      // Flexible spec object

  // Media
  images: "url[](1,10)",                      // 1-10 product images
  videos: "url[](,3)?",                       // Optional videos

  // Status and metadata
  status: Make.union("draft", "active", "archived"),
  featured: "boolean",
  createdAt: "date",
  updatedAt: "date",

  // SEO
  seo: {
    title: "string(,60)?",
    description: "string(,160)?",
    keywords: "string[](,10)?"
  }?
});

---

Performance and Bundle Size

Optimization Features

• Tree-shakable: Only import what you use
• Minimal runtime: Optimized validation algorithms
• Type inference: Zero runtime type overhead
• Efficient parsing: Fast validation with detailed error messages

Bundle Impact

// Import only what you need
import { Interface } from "fortify-schema"; // Core only
import { Interface, Make } from "fortify-schema"; // + Union types
import { Interface, Make, Mod } from "fortify-schema"; // + Transformations

// Advanced extensions (tree-shakable)
import {
  Smart,
  When,
  Live,
  Docs,
  Extensions,
  Quick,
  TypeScriptGenerator,
} from "fortify-schema";

// Individual extension imports for minimal bundle size
import { Smart } from "fortify-schema"; // Smart inference only
import { When } from "fortify-schema"; // Conditional validation only
import { Live } from "fortify-schema"; // Real-time validation only
import { Docs } from "fortify-schema"; // Documentation generation only

---

Migration Guide

From Zod

// Zod
const zodSchema = z.object({
  name: z.string().min(2).max(50),
  age: z.number().int().positive().optional(),
  email: z.string().email(),
  role: z.enum(["user", "admin"]),
});

// Fortify Schema
const fortifySchema = Interface({
  name: "string(2,50)",
  age: "number(1,)?",
  email: "email",
  role: Make.union("user", "admin"),
});

From Joi

// Joi
const joiSchema = Joi.object({
  name: Joi.string().min(2).max(50).required(),
  age: Joi.number().integer().positive(),
  email: Joi.string().email(),
});

// Fortify Schema
const fortifySchema = Interface({
  name: "string(2,50)",
  age: "number(1,)",
  email: "email",
});

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TypeScript Integration

Perfect Type Inference

Fortify Schema provides industry-leading TypeScript integration:

const schema = Interface({
  id: "number",
  name: "string",
  tags: "string[]?",
  status: Make.union("active", "inactive"),
  role: Make.const("user"),
});

type InferredType = typeof schema._type;
// Equivalent to:
// {
//   id: number;
//   name: string;
//   tags?: string[];
//   status: "=active" | "inactive";
//   role: "=user";
// }

Compile-Time Safety

// TypeScript prevents invalid properties
const result = schema.safeParse({
  id: 1,
  name: "John",
  invalidProperty: "error", // ❌ TypeScript error
});

// For unknown data, use safeParseUnknown
const unknownResult = schema.safeParseUnknown(apiData);

IDE Support

• IntelliSense: Full autocomplete for schema properties
• Type checking: Real-time validation of schema definitions
• Error highlighting: Immediate feedback on type mismatches
• Hover information: Detailed type information on hover

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API Reference

Interface()

Create a schema from an interface-like definition.

Interface(definition: SchemaDefinition): Schema<T>

Make

Utility for creating complex types safely.

Make.const(value); // Literal constant
Make.union(...values); // Union type
Make.unionOptional(...values); // Optional union type

Mod

Schema transformation utilities.

Mod.merge(schema1, schema2); // Combine schemas
Mod.pick(schema, keys); // Select specific fields
Mod.omit(schema, keys); // Remove specific fields
Mod.partial(schema); // Make all fields optional
Mod.required(schema); // Make all fields required
Mod.extend(schema, definition); // Add new fields

Extensions

Advanced features for complex validation scenarios.

// Smart inference - Generate schemas automatically
Smart.fromSample(data); // Generate schema from sample data
Smart.fromJsonSchema(jsonSchema); // Convert from JSON Schema
Smart.fromType<T>(); // Generate from TypeScript type

// Conditional validation - Dependent field validation
When.field("role").is("admin").then("string[]").else("string[]?");
When.custom((data) => data.age >= 18)
  .then("string")
  .else("string?");

// Real-time validation - Live validation system
Live.validator(schema); // Create live validator
Live.stream(schema); // Stream-based validation

// Documentation generation - Automatic docs
Docs.generate(schema); // Generate documentation
Docs.typescript(schema); // Generate TypeScript definitions
Docs.openapi(schema); // Generate OpenAPI specification

// Unified extensions access
Extensions.Smart.fromSample(data); // Access via Extensions object
Extensions.When.field("role"); // Organized by category
Extensions.Live.validator(schema); // Consistent API

// Quick shortcuts for common operations
Quick.fromSample(data); // Smart.fromSample shortcut
Quick.when("role").is("admin"); // When.field shortcut
Quick.live(schema); // Live.validator shortcut
Quick.docs(schema); // Docs.generate shortcut

Schema Methods

schema.parse(data); // Parse with exceptions
schema.safeParse(data); // Safe parse with known data
schema.safeParseUnknown(data); // Safe parse with unknown data
schema.loose(); // Enable type coercion
schema.strict(); // Prevent extra properties

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Contributing

We welcome contributions! Please see our Contributing Guide for details.

Development Setup

# Clone the repository
git clone https://github.com/Nehonix-Team/fortify-schema.git

# Install dependencies
npm install

# Run tests
npm test

# Build the project
npm run build

Reporting Issues

Please use our GitHub Issues to report bugs or request features.

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License

MIT © Nehonix Team

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Support and Community

• Documentation: GitHub Repository
• Issues: Bug Reports & Feature Requests
• Discussions: Community Forum
• NPM Package: fortify-schema

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Built with precision and care by the Nehonix Team