class-transformer
typescript-is
Our great sponsors
class-transformer | typescript-is | |
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24 | 9 | |
6,494 | 950 | |
1.3% | - | |
6.9 | 4.2 | |
10 days ago | 9 months ago | |
TypeScript | TypeScript | |
MIT License | MIT License |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
class-transformer
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[Nestia] Boost up your NestJS server much faster and easier (maximum 20,000x faster)
JSON serialization is 200x faster than class-transformer
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How can I declare, integrate a JSON (or similar type that is supposed to be data sent from a server) file into my Angular app, and use it;s data to display the array of Devices within it?
Also OP can check out class-transformer + class-validator if he want to properly instantiate objects and validate them with precise and verbose output of potential format errors. OP can even go the god tier way by setting up a custom RxJS operator that does that for him easily.
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NestJS GraphQL image upload into a S3 bucket
Start by installing the class-transformer and class-validator packages for dto validation (see more in the docs), sharp for image optimization, and the S3 client packages.
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NextJS + Prisma how to handle case sensitivity for usernames/emails?
And you can always transform the input in the DTO using class-transformer or use case insensitive when you search.
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class-transformer intermittent failures
Anyone here using https://github.com/typestack/class-transformer and now seeing intermittent failures using either plainToClass or plainToInstance?
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Fixing a Promise return object to be typed in Typescript
View on GitHub
- 10x faster JSON.stringify() function and run-time type checkers
- Why doesn’t TypeScript natively do any type checking
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Is there a simpler way to cast a complex object into a simpler object?
My two cents: class-transformer it will require to use decorators in your code, but it can handle more cases
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class-transformer VS TypeManager.TS - a user suggested alternative
2 projects | 22 May 2022
typescript-is
- Good bye "typescript-is" (ancestor of "typia", 20,000x faster validator)
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Typing for JSON Payloads
I'll throw https://github.com/woutervh-/typescript-is in the mix as well.
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Handling json input in an express app
I'm a fan of typescript-is. Provides both compile time and run time validations
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What can I *use* Rust for?
For what it's worth, thanks to TypeScript transformers (a feature baked into the compiler), one can create a transformer library that verifies an object is valid for any TypeScript type and conveys that information to the typechecker. And indeed, it's already been made. It allows to parse unknown into a given T. This is nice, because one can generate a JSON schema out of a TS type, for other languages/codebases to integrate safely.
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Do you use code generators? If so, which ones?
But to make it worth the comment, I’ll point people to typescript-is which uses transformations at compile-time to generate run-time type checking code.
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TypeScript runtime type-checking - designed for simple use, through to enforcing API payload schema
Then there's also typescript-is, which is pretty neat because it converts actual compile-time type definitions to runtime type checks, so it doesn't require changing the type definitions.
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JSON Schema === Runtime Type System for TypeScript
typescript-is. This uses a compile-time transformer to generate code for type-checking. You'll need to use ttypescript instead of typescript to compile your code (I recommend setting this up with ts-patch). It won't work if your build pipeline is actually using something like esbuild or Babel to transpile TS->JS.
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How an Anti-TypeScript “JavaScript developer” like me became a TypeScript fan
If you're not using a bunch of generics, check out typescript-is [1]. It takes little work to get it setup, but it generates run time type checks for you. I understand why typescript decided to not add this functionality to the core of the language, but it's starting to feel like the largest missing piece of typescript is a built-in way to generate run-time type-checks for user-defined types from just the type definition.
The happy medium we've found with that module is using the runtime type-check on anything "unsafe" to bless the result using typescript-is's equals functionality, but still allowing programmers to use casting with a comment justifying its necessity. For us our list of unsafe is results pulled from the db, anything parsed from JSON, and incoming request bodies (which can be a special case of parsing from JSON, but not always).
What are some alternatives?
zod - TypeScript-first schema validation with static type inference
runtypes - Runtime validation for static types
TypeORM - ORM for TypeScript and JavaScript. Supports MySQL, PostgreSQL, MariaDB, SQLite, MS SQL Server, Oracle, SAP Hana, WebSQL databases. Works in NodeJS, Browser, Ionic, Cordova and Electron platforms.
class-validator - Decorator-based property validation for classes.
typebox - Json Schema Type Builder with Static Type Resolution for TypeScript
ts-node - TypeScript execution and REPL for node.js
joi - The most powerful data validation library for JS [Moved to: https://github.com/hapijs/joi]
io-ts - Runtime type system for IO decoding/encoding
ajv - The fastest JSON schema Validator. Supports JSON Schema draft-04/06/07/2019-09/2020-12 and JSON Type Definition (RFC8927)