{"id":11853,"date":"2014-02-19T21:42:28","date_gmt":"2014-02-19T16:12:28","guid":{"rendered":"http:\/\/www.tothenew.com\/blog\/?p=11853"},"modified":"2016-12-19T15:31:07","modified_gmt":"2016-12-19T10:01:07","slug":"validation-with-mongoose","status":"publish","type":"post","link":"https:\/\/www.tothenew.com\/blog\/validation-with-mongoose\/","title":{"rendered":"Validation with Mongoose"},"content":{"rendered":"

In one of our Node.js<\/strong> projects, we used Mongoose<\/strong> module to interact with MongoDB<\/strong>. Mongoose<\/strong> provides us four types of built-in validation on schema<\/strong> as below:<\/p>\n

1. Required<\/strong>: We can mark a field as required<\/strong>, which must be provided.
\n2. Limit<\/strong>: If field is type of Number<\/strong> in Schema<\/strong>, then we can restrict maximum<\/strong> and minimum<\/strong> value for that field.
\n3. ENUM<\/strong>: If field is type of String<\/strong> in Schema<\/strong>, then we can provide the list of Strings<\/strong> which should match<\/strong> with the value in that field.
\n4. Match<\/strong>: If field is type of String<\/strong> in Schema<\/strong>, then we can provide regex<\/strong> to match<\/strong> that value.<\/p>\n

Let\u2019s go through each one of them with examples:<\/p>\n

[js]
\n\/*
\n* requiring mongoose module.
\n* *\/
\nvar mongoose = require (‘mongoose’);<\/p>\n

\/\/ Defining ENUMs for the gender field which will use for validation.
\nvar genders = ‘MALE FEMALE’.split(‘ ‘)<\/p>\n

\/\/ Connecting with mongodb(validation db).
\nmongoose.connect(‘mongodb:\/\/localhost\/validation’);<\/p>\n

\/*
\n* Defining User Schema with name(as Required Field), age(with Minimum and Maximum values),
\n* gender (which is ENUM, so it can be MALE or FEMALE only) and last one is email (which
\n* will match the provided regex.)
\n* *\/
\nvar UserSchema = mongoose.Schema({
\n name: {type: String, required: true}, \/\/ 1. Required validation
\n age: {type: Number, min: 16, max: 60}, \/\/ 2. Minimum and Maximum value validation
\n gender: {type: String, enum: genders}, \/\/ 3. ENUM validation
\n email: {type: String, match: \/\\S+@\\S+\\.\\S+\/} \/\/ 4. Match validation via regex
\n});<\/p>\n

var User = mongoose.model(‘User’, UserSchema);<\/p>\n

\/*
\n* When we call save function on the model, then first it calls validate function to validate
\n* the values. Validate method takes callback as argument, if any error occurs at the time
\n* of validating values then validate function calls callback with errors otherwise calls
\n* with null.
\n* *\/
\nnew User({age: 25}).validate(function (error) {
\n console.log("ERROR: ", error); \/\/ Error for Name Field because its marked as Required.
\n});
\nnew User({name: "Amit Thakkar", age:15}).validate(function (error) {
\n console.log("ERROR: ", error); \/\/ Error for Age Field, age is less than Minimum value.
\n});
\nnew User({name: "Amit Thakkar", age:61}).validate(function (error) {
\n console.log("ERROR: ", error); \/\/ Error for Age Field, age is more than Maximum value.
\n});
\nnew User({name: "Amit Thakkar", age:25, gender:"male"}).validate(function (error) {
\n console.log("ERROR: ", error); \/\/ Error for Gender Field, male does not match with ENUM.
\n});
\nnew User({name: "Amit Thakkar", age:25, gender:"MALE", email:"amit.kumar@intelligrape"}).validate(function (error) {
\n console.log("ERROR: ", error); \/\/ Error for Invalid Email id.
\n});
\nnew User({name: "Amit Thakkar", age:25, gender:"MALE", email:"amit.kumar@intelligrape.com"}).validate(function (error) {
\n console.log("ERROR: ", error); \/\/ Error will be undefined
\n});
\n[\/js]<\/p>\n

Amit Kumar
\namit.kumar@intelligrape.com<\/a>
\nin.linkedin.com\/in\/amitkumar0110
\ntwitter.com\/amit_kumar0110
\nMore Blogs by Me<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

In one of our Node.js projects, we used Mongoose module to interact with MongoDB. Mongoose provides us four types of built-in validation on schema as below: 1. Required: We can mark a field as required, which must be provided. 2. Limit: If field is type of Number in Schema, then we can restrict maximum and […]<\/p>\n","protected":false},"author":52,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":8},"categories":[1185],"tags":[1317,1318,4846,1316,1124,1177,901],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/11853"}],"collection":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/users\/52"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/comments?post=11853"}],"version-history":[{"count":0,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/11853\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/media?parent=11853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/categories?post=11853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/tags?post=11853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}