gesv (good enough schema validation) helps you to validate data types of any JavaScript object. It can be useful in validating of JSON-response from an API. gesp is extra-small (~250B minified and gzipped) and zero dependencies library.
$ npm install --save gesv
- simple API
- schema splitting
- custom validators
- zero dependencies
- extra-small size
Usage of gesv is much more straightforward that usage of any JSON Schema library. All API and built-in validators are presented in the example below:
const Schema = require('gesv')
Schema.for(Number).isValidFor(5) // true
Schema.for(Number).isValidFor(NaN) // false
Schema.for(String).isValidFor('Str') // true
Schema.for(String).isValidFor('') // true
Schema.for(Boolean).isValidFor(true) // true
Schema.for(Schema.optional(Number)).isValidFor(undefined) // true
Schema.for(Schema.optional(Number)).isValidFor(null) // true
Schema.for(Schema.optional(Number)).isValidFor(42) // true
Schema.for([ Boolean ]).isValidFor([ true, false ]) // true
Schema.for([ String ]).isValidFor([]) // true
Schema.for([ Number ]).isValidFor([ 1, 2, true ]) // false
Schema.for([ Schema.any() ]).isValidFor([ null, undefined, 42, 'foo', [], {} ]) // true
Schema.for({
id: Number,
name: String,
comments: [{
id: Number,
text: String,
}]
}).isValidFor({
id: 42,
name: 'Doge',
comments: [{
id: 24,
text: 'Wow!'
}, {
id: 25,
text: 'Such validation!'
}]
}) // trueWith gesv you can also split your schema in separate reusable parts:
const Schema = require('gesv')
const commentSchema = Schema.for({
id: Number,
text: String,
})
const postSchema = Schema.for({
id: Number,
name: String,
comments: [ commentSchema ]
})
postSchema.isValidFor({
id: 42,
comments: [{
id: 24,
text: 'Such validation!'
}]
}) // false
postSchema.isValidFor({
id: 42,
name: 'Name',
comments: [{
id: 24,
text: 'Such validation!'
}]
}) // trueIf built-in validators can not solve your specific problem, you can write your own custom validators:
const Schema = require('gesv')
const gender = anObject => [ 'male', 'female' ].includes(anObject)
const userSchema = Schema.for({
id: Number,
gender: gender,
age: Schema.optional(Number),
})
userSchema.isValidFor({
id: 10,
gender: 'male',
}) // true
userSchema.isValidFor({
id: 11,
gender: 'bar',
age: 43,
}) // false
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