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microschema
Advanced tools
Small library without dependencies to create JSON Schemas in a concise way.
Example:
const ms = require('microschema')
ms.strictObj({
identityId: 'string:required',
clientId: 'number',
redirectUri: 'string:uri',
scope: 'string',
ipAddress: ms.string({pattern: ''}),
children: ms.arrayOf(ms.strictObj({
scope: 'string'
}))
})
Using the ms.string()
method:
ms.string()
output = {type: 'string'})
ms.string({pattern: '[a-z]+'})
// Passing a javascript RegExp is equivalent to the above
ms.string({pattern: /[a-z]+/})
output = {
type: 'string',
pattern: '[a-z]+'
}
Specifying a format:
ms.string({format: 'email'})
output = {
type: 'string',
format: 'email'
}
Note: Check which formats are available with your JSON Schema implementation before using this.
Specifying min and max length:
ms.string({minLength: 3, maxLength: 50})
output = {
type: 'string',
minLength: 3,
maxLength: 50
}
Setting the required flag (only possible within an object):
ms.obj({
foo: ms.required.string()
})
output = {
type: 'object',
required: ['foo'],
properties: {
foo: {
type: 'string'
}
}
}
Simplified usage within objects:
ms.obj({
foo: 'string'
})
output = {
type: 'object',
properties: {
foo: {
type: 'string'
}
}
}
ms.obj({
foo: 'string:required'
})
output = {
type: 'object',
required: ['foo'],
properties: {
foo: {
type: 'string'
}
}
}
Simplified usage within objects:
ms.obj({
foo: 'string'
})
Using the ms.number()
method:
ms.number()
output = {type: 'number'}
ms.number({min: 0, max: 10})
output = {
type: 'number',
minimum: 0,
maximum: 10
}
Using the ms.integer()
method:
ms.integer()
output = {type: 'integer'}
The integer()
methods also accepts min
and max
params the same as number()
does.
ms.boolean()
output = {type: 'boolean'})
Simplified usage within objects:
ms.obj({
foo: 'boolean:required'
})
output = {
type: 'object',
required: ['foo'],
properties: {
foo: {
type: 'boolean'
}
}
}
ms.null()
output = {type: 'null'})
ms.obj()
output = {type: 'object'}
Don't allow additional properties with strictObj()
:
ms.strictObj({
count: ms.integer()
})
output = {
type: 'object',
additionalProperties: false,
properties: {
count: {type: 'integer'}
}
}
Add title
and description
annotations to the schema:
ms.obj({
displayName: 'string',
}, {title: 'Title', description: 'Desc.'})
output = {
type: 'object',
title: 'Title',
description: 'Desc.',
properties: {
displayName: {type: 'string'}
}
}
Add dependencies
:
ms.obj({
creditCard: 'string',
address: 'string'
}, {dependencies: {creditCard: 'address'}})
output = {
type: 'object',
properties: {
creditCard: {type: 'string'},
address: {type: 'string'}
},
dependencies: {
creditCard: ['address']
}
}
Set a default
value in case the property is absent:
ms.obj({
creditCard: 'string',
address: 'string'
}, {default: {}})
output = {
type: 'object',
default: {},
properties: {
count: {type: 'integer'}
}
}
ms.arrayOf(ms.string())
output = {
type: 'array',
items: {type: 'string'}
}
You can use these additional modifiers:
ms.arrayOf(ms.string(), {minItems: 1, maxItems: 3, uniqueItems: true})
output = {
type: 'array',
items: {type: 'string'},
minItems: 1,
maxItems: 3,
uniqueItems: true
}
// All values in an enumeration must be of the same type.
ms.enum('foo', 'bar')
output = {
type: 'string',
enum: ['foo', 'bar']
}
ms.const('foo')
// The output is the same as ms.enum('foo') as there is no equivalent
// to value in JSON schema.
output = {
type: 'string',
const: 'foo'
}
ms.types('string', 'number')
output = {
type: ['string', 'number']
}
ms.types(ms.string({format: 'uri'}), ms.number({min: 0}))
output = {
type: ['string', 'number'],
format: 'uri',
minimum: 0
}
ms.anyOf('number', ms.obj({foo: 'string'}))
output = {
anyOf: [
{type: 'number'},
{
type: 'object',
properties: {
foo: {type: 'string'}
}
}
]
}
Note: you can also pass an array as the first argument
ms.$id('#user').obj({
name: 'string',
friend: ms.$ref('#user')
})
output = {
$id: '#user',
type: 'object',
properties: {
name: {type: 'string'}
friend: {$ref: '#user'}
}
}
ms.definitions({
user: ms.obj({name: 'string'})
}).obj({
name: 'string',
friend: ms.$ref('#/definitions/user')
})
output = {
definitions: {
user: {
type: 'object',
properties: {
name: {type: 'string'}
}
}
}
type: 'object',
properties: {
name: {type: 'string'}
friend: {$ref: '#/definitions/user'}
}
}
FAQs
Helper library to create JSON Schemas in a concise way.
The npm package microschema receives a total of 1,368 weekly downloads. As such, microschema popularity was classified as popular.
We found that microschema demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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