Nestia is a set of helper libraries for NestJS, supporting below features:

• @nestia/core: super-fast decorators
  • 20,000x faster validation
  • 200x faster JSON serialization
• @nestia/sdk: evolved SDK and Swagger generators
  • SDK (Software Development Kit)
    • interaction library for client developers
    • almost same with tRPC
• nestia: just CLI (command line interface) tool

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npx nestia start <directory>

Just run above command, then boilerplate project would be constructed.

npm install --save-dev nestia
npx nestia setup

If you've installed ttypescript during setup, you should compile @nestia/core utilization code through ttsc command, instead of tsc.

# COMPILE THROUGH TTYPESCRIPT
npx ttsc

# RUN TS-NODE WITH TTYPESCRIPT
npx ts-node -C ttypescript src/index.ts

Otherwise, you've chosen ts-patch, you can use original tsc command. However, ts-patch hacks node_modules/typescript source code. Also, whenever update typescript version, you've to run npm run prepare command repeatedly.

By the way, when using @nest/cli, you must just choose ts-patch.

# USE ORIGINAL TSC COMMAND
tsc
npx ts-node src/index.ts

# WHENVER UPDATE
npm install --save-dev typescript@latest
npm run prepare

If you want to install and configure nestia manually, read Guide Documents -> Setup.

Super-fast validation decorators for NestJS.

• 15,000x faster request body validation
• 100x faster JSON response, even type safe
• Do not need DTO class definition, just fine with interface

@nestia/core is a transformer library of NestJS, supporting super-fast validation decorators, by wrapping typia. Comparing validation speed with class-validator, typia is maximum 15,000x times faster and it is even much safer.

Furthermore, @nestia/core can use pure interface typed DTO with only one line. With @nestia/core, you don't need any extra dedication like defining JSON schema (@nestjs/swagger), or using class definition with decorator function calls (class-validator). Just enjoy the superfast decorators with pure TypeScript type.

import { Controller } from "@nestjs/common";
import { TypedBody, TypedRoute } from "@nestia/core";

import type { IBbsArticle } from "@bbs-api/structures/IBbsArticle";

@Controller("bbs/articles")
export class BbsArticlesController {
    /** 
     * Store a new content.
     * 
     * @param inupt Content to store
     * @returns Newly archived article
     */
    @TypedRoute.Post() // 50x faster and safer JSON.stringify()
    public async store(
        @TypedBody() input: IBbsArticle.IStore // super-fast validator
    ): Promise<IBbsArticle>; 
        // do not need DTO class definition, 
        // just fine with interface
}

If you want to know more about this core library, visit Guide Documents.

• Decorators
  • TypedRoute
  • TypedBody
  • TypedQuery
  • TypedParam
• Enhancements
  • Comment Tags
  • Configuration
• Advanced Usage
  • DynamicModule
  • Encryption
  • Inheritance

Automatic SDK and Swagger generator for @nestia/core.

With @nestia/core, you can boost up validation speed maximum 15,000x times faster. However, as @nestjs/swagger does not support @nestia/core, you can't generate swagger documents from @nestjs/swagger more.

Instead, I provide you @nestia/sdk module, which can generate not only swagger documents, but also SDK (Software Development Kit) library. The SDK library can be utilized by client developers and it is almost same with tRPC.

# BASIC COMMAND
npx nestia <sdk|swagger> <source_directories_or_patterns> \
    --exclude <exclude_directory_or_pattern> \
    --out <output_directory_or_file>

# EXAMPLES
npx nestia sdk "src/**/*.controller.ts" --out "src/api"
npx nestia swagger "src/controllers" --out "dist/swagger.json"

# ONLY WHEN "nestia.config.ts" FILE EXISTS
npx nestia sdk
npx nestia swagger

You can generate sdk or swagger documents by above commands.

If you want to know more, visit Guide Documents.

• Generators
  • Swagger Documents
  • SDK Library
• Advanced Usage
  • Comment Tags
  • Configuration

Here is example projects building Swagger Documents and SDK Library with npx nestia swagger and npx nestia sdk comands. @nestia/sdk generates those documents and libraries by analyzing your NestJS backend server code in the compilation level.

https://github.com/samchon/typia

@nestia/core is wrapping typia and the typia is:

// RUNTIME VALIDATORS
export function is<T>(input: unknown | T): input is T; // returns boolean
export function assert<T>(input: unknown | T): T; // throws TypeGuardError
export function validate<T>(input: unknown | T): IValidation<T>; // detailed
export const customValidators: CustomValidatorMap; // can add custom validators

// JSON
export function application<T>(): IJsonApplication; // JSON schema
export function assertParse<T>(input: string): T; // type safe parser
export function assertStringify<T>(input: T): string; // safe and faster
    // +) isParse, validateParse 
    // +) stringify, isStringify, validateStringify

// RANDOM
export function random<T>(g?: Partial<IRandomGenerator>): Primitive<T>;

typia is a transformer library of TypeScript, supporting below features:

• Super-fast Runtime Validators
• Safe JSON parse and fast stringify functions
• JSON schema generator
• Random data generation

All functions in typia require only one line. You don't need any extra dedication like JSON schema definitions or decorator function calls. Just call typia function with only one line like typia.assert<T>(input).

Also, as typia performs AOT (Ahead of Time) compilation skill, its performance is much faster than other competitive libaries. For an example, when comparing validate function is() with other competitive libraries, typia is maximum 20,000x times faster than class-validator.