@sumor/validator
v1.2.2
Published
This is a lightweight validator for Node.JS. It can validate the input string or number based on the rules you defined.
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validator
A Sumor Cloud Tool.
More Documentation
This is a lightweight validator for Node.JS. It can validate the input string or number based on the rules you defined.
Installation
npm i @sumor/validator --save
Prerequisites
Node.JS version
Require Node.JS version 18.x or above
require Node.JS ES module
As this package is written in ES module,
please change the following code in your package.json
file:
{
"type": "module"
}
Usage
Basic Usage
import { validate, format } from '@sumor/validator'
const parameterDefinition = {
// please refer to the following section for the detail
rule: [
{
code: 'ONLY_CHAR_DIGIT',
expression: '^[a-zA-Z0-9]*$',
message: 'only allow a-z, A-Z, 0-9'
}
]
}
// validate the input, return the error message
const messages = validate(parameterDefinition, 'de1234567')
console.log(messages) // [ 'only allow a-z, A-Z, 0-9' ]
// format the input, return the formatted value
const value = format(parameterDefinition, ' demo ')
console.log(value) // will print "demo", useless space will be removed
Parameter Definition
- [optional]
type
data type, supportstring
,number
,array
,file
, default isstring
- [optional]
required
required or not, default is false - [optional]
length
length of the string, default is 0 means no limit - [optional]
default
default value, default is null - [optional]
rule
rule for the validation, default is empty array, please refer to the following section for the detail - [optional]
trim
trim the string or not, default is true for string type - [optional]
lowerCase
convert the string to lowercase or not, default is false - [optional]
upperCase
convert the string to uppercase or not, default is false - [optional]
decimal
decimal for the number, default is null, 0 means no decimal - [optional]
i18n
i18n for the error message, default is empty object, please refer to the following section for the detail - [optional]
error
output error or not, default is false
for array type, rule
, default
, trim
, lowerCase
, upperCase
, decimal
are working for each item in the array.
for file type, rule
is working for the file object.
Rule Definition
code
identifier for the rule, translate message based on this codemessage
original message for the rule- [optional]
expression
rule expression, should be a regular expression - [optional]
function
rule function, should be a function, return true if pass the rule
// argument for the function
// value: the value for the parameter
// info: the parameter definition
// language: current language
;(value, info, language) => {
return value > 5
}
I18n Definition
Structure should be like the following:
{
"language": {
"code": "message"
}
}
language
language code, supporten
,zh
,zh-TW
and so oncode
identifier for the rule, should be the same as the rule codemessage
translated message for the rule
Validate String Usage
import { validate } from '@sumor/validator'
const parameterDefinition = {
type: 'string',
required: true,
length: 10,
rule: [
// only allow a-z, A-Z, 0-9
{
code: 'ONLY_CHAR_DIGIT',
expression: '^[a-zA-Z0-9]*$',
message: 'only allow a-z, A-Z, 0-9'
},
// need include demo
{
code: 'INCLUDE_DEMO',
expression: 'demo',
message: 'need include demo'
},
// use function to check
{
code: 'LENGTH_GREATER_THAN_5',
function: value => {
return value.length > 5
},
message: 'length should be greater than 5'
}
],
i18n: {
zh: {
ONLY_CHAR_DIGIT: '只允许输入字母和数字',
INCLUDE_DEMO: '需要包含demo',
LENGTH_GREATER_THAN_5: '长度应大于5'
},
'zh-TW': {
ONLY_CHAR_DIGIT: '只允許輸入字母和數字',
INCLUDE_DEMO: '需要包含demo',
LENGTH_GREATER_THAN_5: '長度應大於5'
}
}
}
const messages1 = validate(parameterDefinition, 'demo123456')
console.log(messages1) // []
const messages2 = validate(parameterDefinition, 'de1234567')
console.log(messages2) // [ 'only allow a-z, A-Z, 0-9' ]
const messages3 = validate(parameterDefinition, 'demo!')
console.log(messages3) // [ 'only allow a-z, A-Z, 0-9', 'need include demo' ]
const messages4 = validate(parameterDefinition, 'de!mo')
console.log(messages4) // [ 'only allow a-z, A-Z, 0-9', 'need include demo' ]
const messages5 = validate(parameterDefinition, 'de')
console.log(messages5) // [ 'only allow a-z, A-Z, 0-9', 'need include demo', 'length should be greater than 5' ]
// translate to zh
const messages6 = validate(parameterDefinition, 'de', 'zh')
console.log(messages6) // [ '只允许输入字母和数字', '需要包含demo', '长度应大于5' ]
// translate to zh-TW
const messages7 = validate(parameterDefinition, 'de', 'zh-TW')
console.log(messages7) // [ '只允許輸入字母和數字', '需要包含demo', '長度應大於5' ]
Validate Number Usage
import { validate } from '@sumor/validator'
const parameterDefinition = {
type: 'number',
required: true,
rule: [
// need greater than 5
{
code: 'GREATER_THAN_5',
function: value => {
return value > 5
},
message: 'value should be greater than 5'
}
],
i18n: {
zh: {
GREATER_THAN_5: '值应大于5'
},
'zh-TW': {
GREATER_THAN_5: '值應大於5'
}
}
}
const messages1 = validate(parameterDefinition, 6)
console.log(messages1) // []
const messages2 = validate(parameterDefinition, 5)
console.log(messages2) // [ 'value should be greater than 5' ]
const messages3 = validate(parameterDefinition, 4)
console.log(messages3) // [ 'value should be greater than 5' ]
// translate to zh
const messages4 = validate(parameterDefinition, 4, 'zh')
console.log(messages4) // [ '值应大于5' ]
// translate to zh-TW
const messages5 = validate(parameterDefinition, 4, 'zh-TW')
console.log(messages5) // [ '值應大於5' ]
Validate Array Usage
import { validate } from '@sumor/validator'
const parameterDefinition = {
type: 'array',
required: true,
length: 3,
rule: [
// need greater than 5
{
code: 'GREATER_THAN_5',
function: value => {
return value > 5
},
message: 'value should be greater than 5'
},
// should be a number
{
code: 'SHOULD_BE_NUMBER',
expression: '^[0-9]*$',
message: 'should be a number'
}
]
}
const messages1 = validate(parameterDefinition, [6, 7, 8])
console.log(messages1) // []
const messages2 = validate(parameterDefinition, [6, 7, '8'])
console.log(messages2) // [ 'should be a number' ]
const messages3 = validate(parameterDefinition, [6, 7, 4])
console.log(messages3) // [ 'value should be greater than 5' ]
const messages4 = validate(parameterDefinition, [6, 7, 4, 5])
console.log(messages4) // [ 'Length must be less than or equal to 3 items', 'value should be greater than 5' ]
Validate File Usage
import { validate } from '@sumor/validator'
const parameterDefinition = {
type: 'file',
required: true,
length: 3,
rule: [
// need greater than 5
{
code: 'GREATER_THAN_5',
function: value => {
return value.size > 5
},
message: 'size should be greater than 5'
}
]
}
const messages1 = validate(parameterDefinition, { size: 6 })
console.log(messages1) // []
const messages2 = validate(parameterDefinition, { size: 4 })
console.log(messages2) // [ 'size should be greater than 5' ]
Format String Usage
Trim Usage
will remove the useless space for prefix and suffix
import { format } from '@sumor/validator'
const parameterDefinition = {
type: 'string',
trim: true // default is true for string type
}
const value = format(parameterDefinition, ' demo ')
console.log(value) // will print "demo", useless space will be removed
Lowercase Usage
will convert the string to lowercase
import { format } from '@sumor/validator'
const parameterDefinition = {
type: 'string',
lowercase: true
}
const value = format(parameterDefinition, 'Demo')
console.log(value) // will print "demo", all characters will be converted to lowercase
Uppercase Usage
will convert the string to uppercase
import { format } from '@sumor/validator'
const parameterDefinition = {
type: 'string',
uppercase: true
}
const value = format(parameterDefinition, 'Demo')
console.log(value) // will print "DEMO", all characters will be converted to uppercase
Format Number Usage
import { format } from '@sumor/validator'
const parameterDefinition = {
type: 'number',
decimal: 2
}
const value1 = format(parameterDefinition, 1.234)
console.log(value1) // will print 1.23, only keep 2 decimal
const value2 = format(parameterDefinition, '1.234')
console.log(value2) // will convert to number 1.23, only keep 2 decimal
Enable Output Error
If you pass error:true, response will be an SumorError object. You can change language and export json support by @sumor/error
import { validate } from '@sumor/validator'
const parameterDefinition = {
error: true,
type: 'string',
required: true,
length: 10,
rule: [
{
code: 'LENGTH_GREATER_THAN_5',
expression: value => {
return value.length > 5
},
message: 'length should be greater than 5'
}
]
}
const messages = validate(parameterDefinition, 'demo123456')
console.log(messages)
/*
SumorError
{
code: 'LENGTH_GREATER_THAN_5',
message: 'length should be greater than 5'
}
*/