Validates and whitelists input data using Joi schemas and/or custom functions
npm install input-validatorinput-validator
===============
Validates and whitelists input data using Joi schemas and/or custom functions.
``
npm install input-validator
Example usage in a Node express app:
` js
var express = require('express');
var app = express();
var Joi = require('joi');
var validate = require('input-validator');
var customerSchema = Joi.object().keys({
name: Joi.string().min(5).max(50),
// ... etc
});
app.post('/createCustomer', function(req, res) {
var vInput = validate(req.params, customerSchema);
// vInput now contains 'name' from req.params (assuming it validated ok), and nothing else
// validate function will throw a ValidationError if anything amiss
// ...
});
`
` js
var validate = require('input-validator');
// FORM 1:
var whitelistedData = validate( data / ,[data], [schema|validationFn]+ */ );
// E.g:
// var whitelistedData = validate(req.query, customerCodeSchema);
// var whitelistedData = validate(req.query, req.params, schemas.paging, schemas.sorting);
// or, FORM 2:
var whitelistedData = validate(
[data1, schemaOrFunc / [schema|validationFn] */ ],
[data2, schemaOrFunc / [schema|validationFn] */ ],
// ...
);
// E.g:
// var whitelistedData = validate(
// [req.query, schemas.paging, schemas.sorting],
// [req.params, customerCodeSchema, myCustomFunc]
// );
`
The validate function takes:Joi.object().keys({ ... })
* One or more 'data' objects (such as req.params, req.query in a web app).
* Multiple data objects are merged internally before validation is applied.
* One or more Joi schemas or custom validator functions
* The Joi schema should be of the type . See the Joi repo for docs
* See below for custom validation function
As of the time of creating this repo, Joi does not currently support defining custom validators
(although it's a WIP). To get around this and to allow full control, this library supports custom functions of the form:
`js`
function(mergedRawInputData, validDataSoFar) {
var rawValue = mergedRawInputData.foo;
return {
valid: true|false,
message: '"foo" must be 1 when "bar" is true',
value: {
foo: rawValue
}
};
}
Hopefully the param names give it away, but the mergedRawInputData is the raw, unvalidated input;validDataSoFar is all the validated (and hence whitelisted) data processed so far. I.e. if you have:
`js`
var validate = require('input-validator');
var whitelistedData = validate( data1, data2, schema1, myFunc, schema3 );
then myFunc will receive as the second param only data in data1 or data2 which is validated by schema1.
A useful pattern can be to have a library of shared schema types. E.g:
`js
// schemas.js
module.exports = {
paging: Joi.object().keys({
pageFrom: Joi.number().integer().min(0).max(10000).required(),
pageSize: Joi.number().integer().min(1).max(50).required()
}),
customerCode: Joi.object().keys({
custCode: Joi.string().regex(/whatever/).required()
})
};
`
` js
// app.js
var schemas = require('./schemas');
var express = require('express');
var app = express();
var Joi = require('joi');
var validate = require('input-validator');
var customerSchema = Joi.object().keys({
name: Joi.string().min(5).max(50),
// ... etc
});
app.get('/customer/:custCode', function(req, res) {
var vInput = validate(req.query, req.params, schemas.paging, schemas.customerCode);
// For the query: "GET /customer/foo?pageFrom=0&pageSize=10&thisIsIgnored=true", vInput will contain:
// { pageFrom: 0, pageSize: 10, custCode: 'foo' }
// As always, validate function will throw a ValidationError if anything does not validate ok``
});
The MIT License (MIT)
Copyright (c) Panoptix CC
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