https://github.com/kaelzhang/skema
🛰 Skema provides a handy & composable way to validate / transform / purify the input data.
https://github.com/kaelzhang/skema
model schema setter skema struct structure validation
Last synced: about 2 months ago
JSON representation
🛰 Skema provides a handy & composable way to validate / transform / purify the input data.
- Host: GitHub
- URL: https://github.com/kaelzhang/skema
- Owner: kaelzhang
- License: other
- Created: 2014-08-03T01:29:51.000Z (almost 11 years ago)
- Default Branch: master
- Last Pushed: 2020-05-05T15:07:44.000Z (about 5 years ago)
- Last Synced: 2025-04-13T05:04:39.162Z (about 2 months ago)
- Topics: model, schema, setter, skema, struct, structure, validation
- Language: JavaScript
- Homepage: https://npm.im/skema
- Size: 271 KB
- Stars: 356
- Watchers: 3
- Forks: 4
- Open Issues: 4
-
Metadata Files:
- Readme: README.md
- Changelog: HISTORY.md
- License: LICENSE
Awesome Lists containing this project
README
[](https://travis-ci.org/kaelzhang/skema)
[](https://codecov.io/gh/kaelzhang/skema)
# skema
`skema` provides a handy and composable way to validate/transform JavaScript variables:
- **Supports both async and sync flows.** Skema has two working modes to support either async or sync validators, setters, etc, making it capable with much more complicated challenges.
- **NOT only type checker.** Unlike [TypeScript](https://www.typescriptlang.org/), [joi](https://github.com/hapijs/joi), and many others, Skema is not only a JavaScript type checker, but also a good solution for your [Anti-Corruption Layer (ACL)](https://docs.microsoft.com/en-us/azure/architecture/patterns/anti-corruption-layer) to transform and purify the input data. And Skema could also be configured as a simple schema validator too.
- **Pluggable basic types.** Even basic types such as `Number` could also be replaced and customized if using Skema. Actually, in the core of Skema, there is NOT a single definition of one type.
- **Powerful custom types.** Every single type is able to be customized that you can handle almost everything including descriptor, conditions, default values, validators and so on.
- **Composable structures.** You could build a much bigger schema with the small ones into the whole world.
## Install
```sh
npm i skema
```
## Basic Usage
[🔬 Live Demo with JsFiddle](https://jsfiddle.net/kaelzhang/0r3g4ogj/)
```js
import {shape} from 'skema'
// Schema definitions are ONLY objects.
const User = shape({
id: 'number?',
name: String
})
// Then use these definitions to purify our data.
const user = User.from({
id: '1',
name: 'Steve'
})
console.log(user)
// {
// id: 1,
// name: 'Steve'
// }
user.id = 'boooom!'
// throw TypeError
// - message: 'not a number'
// - code: 'VALIDATION_FAILS'
```
## Documentations
- API References
- [APIs](./doc/apis.md)
- [Builtin Types and How to Change Them](./doc/builtins.md)
- [Shape Definition](./doc/shape.md)
- [Working Mode: Sync or Async](./doc/working-mode.md)
- [Assign a Property after `from()`](./doc/assign.md)
- [Error Handling](./doc/errors.md)
- [Contributing](./doc/contributing.md)
## Many Examples
- **Shape Definition**
- [Purify an Object Against a Shape🔬](https://jsfiddle.net/kaelzhang/0wosjdo9/)
- [Default Value of a Property🔬](https://jsfiddle.net/kaelzhang/zhu8crde/)
- [Optional Properties🔬](https://jsfiddle.net/kaelzhang/pesgkw9c/)
- [Skip Processing a Property🔬](https://jsfiddle.net/kaelzhang/joq5vdd7/)
- [Properties Descriptors: Non-Enumerable Properties, ...🔬](https://jsfiddle.net/kaelzhang/yhj2xj72/)
- **Type Definition**
- [Basic Validation](./examples/basic-validation.js) | [Live Demo🔬 ](https://jsfiddle.net/kaelzhang/2au1on62/)
- [Async Validation](./examples/async-validation.js) | [Live Demo🔬](https://jsfiddle.net/kaelzhang/1rr5asyb/)
- [Multiple Validators](./examples/multiple-validators.js)
- [Basic Usage of Setters](./examples/setters.js)
- [Inherit Another Type](./examples/type-inheritance.js)
- [Declare a Type Alias to Make a Shortcut (Live Demo🔬)](https://jsfiddle.net/kaelzhang/7d5u4z0s/)
- [Use Skema as the Strict Type Checker](./examples/strict-basics.js) | [Live Demo🔬](https://jsfiddle.net/kaelzhang/14y4s0e9/)
- [Errors🔬](https://jsfiddle.net/kaelzhang/scvLn8Ly/)
## Related Packages
- [@skema/basic](https://www.npmjs.com/package/@skema/basic) The default built-in javascript types of skema.
## License
MIT