Nestjs dto validation not working

Nestjs dto validation not working. You need to add the @ApiBody decorator to the factory create function. @IsString() name: string | undefined; } This is the controller: Feb 15, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. How to validate an array of objects in nestjs using dto. Use the @Type ( () => YourDTO) to expose what you need. If you need to validate an array of objects, use each: true: Jun 2, 2022 · Similarly, the less function will check if the value is less than the given date. If user_type = F then Firstname cannnot be Empty but Lastname can be Empty. for this i installed class-validator and class-transformer . Jun 14, 2020 · Not at all ! It turned out that my DTO had zero validation rules ! It's that simple : if you get a No metadata found. I am using GraphQl but as I have already configured the pipe globally it must work. I haven't found a way for a DTO to be an array at root level, so the DTO I have is a single object from that array, and the assigned type is then Dto[] which global validation pipe doesn't work with. If you want to add that, you'd have to extend the class and add a way to . API. In the DTO, all fields are set to optional with the @IsOptional()decorator. Finally, as noted earlier, since this is a validation pipe it either returns the value unchanged, or throws an exception. I'm validating a property having an array of objects as value. const microserviceApp = await NestFactory. createMicroservice<MicroserviceOptions>(AppModule, {. Frequently, each controller has more than one route, and different routes can perform Aug 17, 2020 · NeverMind, i Solved it. return body; I'm trying to inject my users service into my validator constraint interface but it doesn't seem to work: import { ValidatorConstraintInterface, ValidatorConstraint, ValidationArguments, Apr 24, 2019 · Finally you can even make use of @IsEmail () decorator to validate the email field is an email, and last thing you can do is combine @IsNotEmpty () and @IsOptional () so that when a field is provided it should not be empty. Jan 1, 2024 · To trigger the validation, use NestJS’s ValidationPipe. I have to translate my exception message into another language based on the request value. controller. import { IsEmail, IsEnum, IsPhoneNumber, IsEmpty, IsOptional } from 'class-validator'; Nov 3, 2022 · 2. catchError() for when that happens. body object. class ArticleParamDTO { @Matches('[a-z0-9\-]+') // comes from class-validator article: string; } And then you can use it in the route handler like @Get(':article') getIndex(@Param() { article }: ArticleParamDto) { } And then as long as you use the ValidationPipe it will all work. I'm setting up a new NestJS application, and I've just added class-validator in order to validate controller input, but it seems to be completely ignored. – Mar 27, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. import {. app. Nov 4, 2022 · use the Res, create a DTO with a generic or a class to extends it and glue it together. }, {. listen(3000); Then you need to annotate the DTO with the @Type () annotation: readonly name: string; Nov 21, 2021 · i am using nestjs/graphql, and i made a dto for a graphql mutation where i used class-validator options like @IsString() and @IsBoolean(). May 21, 2021 · 8. A DTO is an object that defines how the data will be sent over the network. export class Post {. Possible Solution Environment We can validate not only a single field but also can validated an array of objects with DTO in NestJS. @Body () without any argument will return req. import { Type } from 'class-transformer'; import { IsNumberString, IsString, MinLength, ValidateNested } from 'class Jul 4, 2022 · Jul 4, 2022. This is my CreatePostDto: Jan 1, 2024 · Basic Validation with DTO Classes. According to the migration guide from Nest 6 to 7, this should be auto transformed, therefore expected behaviour would be no validation errors. body ['path']. The inheritance is fully working with a factory class, But when the request hit to the controller the validation is not working properly. clientService. But your kind of reinventing the wheel, NestJS takes care of it and you can overwrite the Response status if needed. $ nest new nest-dto-validation May 5, 2020 · You can try looking into the source of this library https://github. Feb 8, 2022 · 2. Follow. Mar 27, 2020 · Convert the test object to the type of DTO. otherProperty: string; Mar 29, 2022 · Validation does not work with Partial<DTO> - NestJS. Have a look at it: NestJs Validation. One of the properies of this object has an array of enums as value. b === 'undefined') @IsString() Jul 25, 2022 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. only('s Mar 30, 2023 · Here’s an example of how to use DTOs and class-validator in NestJS: II. 11. In this article, I want to make a deep dive and explore ways to perform complex validation for incoming requests with NestJS. Nov 29, 2021 · I want to make sure that in the if TEST is set as the value of AMOUNT_CHECK_IN_MODE in . }]. Improve this answer. Nest's ValidationPipe works by default by using class-validator and class-transformer, and classes for the DTO. Sep 10, 2023 · According to the Nestjs docs: But first (if you use TypeScript), we need to determine the DTO (Data Transfer Object) schema. I have some projects with nestjs, I've always used the class validator, but recently it doesn't seem to be working. The Dec 11, 2021 · The mongodb import is a class representation of the bson ObjectId Type. In developement I often use this for testing, it allows you to have multiple accounts with the same email address. When using ValidateNested to validate a nested object on a dto, the validation should fail with validation rules. Aug 11, 2020 · Validation errors: val must be an integer number. Nestjs class validator dto validate body parameters. Jan 11, 2022 · I am trying to Implement inheritance in my DTOs and validate the derived classes. I have two endpoints: 1) to create data with a valid phone number and 2) to retrieve data by a phone number in the route param. The system/ unit should take a set of rules and run validation on that set of rules. That's the point of class-validator. Jul 18, 2022 · In case of your controller it is NestJS which transforms it to an instance of CreateUserDto and then performs the validation. we will just make a type of array then we will validate it. I am new to nestJS and I have added a ValidationPipe () to main. I'll edit my answer with the use of Pipes to validate and transform the incoming payload into a DTO. After that you need to use the I18nValidationPipe. Goto main. Data fields. Please, use our Discord channel (support) for such questions. The conditions are and must be variable as business changes all the time and thus, those rules themselve don't need testing. dto. It uses progressive JavaScript, is built with TypeScript and combines elements of OOP (Object Oriented Programming), FP (Functional Programming), and FRP (Functional Reactive Programming). So, I tried to include the decorator IsNotEmpty() too, but this is not working apparently, because if I pass a empty property, the flow follows. 0. Without the class having these libraries' decorators, the pipe won't do anything for you. Sep 13, 2022 · In following up from this question, I am trying to ensure the validation remains and works. useGlobalPipes(. Add Import: import { ValidationPipe } from '@nestjs/common'; then below line where app is being declared, add this line: app. Any help would be highly appreciated Apr 1, 2021 · I want to be able to pass an array of allowed lengths to check against. To change this behaviour, Nest has to first call plainToClass from class-validator if you're using its ValidationPipe. For instance, I have a basic AdminCodeDTO that sepcifies the AdminCode is required, has a valid value (1-999) Aug 27, 2021 · I am trying to use an exception filter in my NestJS app. When multiple decorators apply to a single declaration, their evaluation is similar to function composition in mathematics. For single query param usage, you can play with this example: import { ArgumentMetadata, BadRequestException, Injectable, PipeTransform } from '@nestjs/common'; type TOptional<T> = T | undefined; @Injectable() export class ValidateEnum<T extends Record<string, unknown>> implements PipeTransform<T> {. new I18nValidationPipe(), Oct 21, 2020 · I have NestJS API, which has a PATCH endpoint for modifying a resource. Once I added the ValidationPipe () into the app definition: app = moduleFixture. useGlobalPipes( new ValidationPipe({ exceptionFactory: errors => new BadRequestException(errors), // TODO: Use graphql errors instead forbidUnknownValues: true, }), ); Jan 31, 2020 · I am using class-validator and nestjs to preform validation on my Http requests. I need to validate if value is a number and not empty. The ValidationPipe will enforce the rules you have set in your DTO. I am running into an issue with supertest when a query parameter ({count: false}) is passed NestJS treats it as a string because the dto validation is not being executed. If you just want to test the transformations, you can assert after this statement. 2. Microservices use RpcException class. Jul 2, 2020 · 29. We initialize a new NestJS project with its CLI. Decorators in Typescript can only apply to classes, class members, class methods, and class method parameters. Test case works in Postman, but not from Visual Studio Code or Jest command line. A controller's purpose is to receive specific requests for the application. useGlobalPipes(new ValidationPipe()); // <- This addition. Nov 1, 2021 · Explanation. ts file for returning the new book instead of all books. If you have any transformations in your DTO, like trimming spaces of the Feb 23, 2022 · It was happening to me also with the same versions ("sequelize": "^6. I am having a ValidationPipe problem. The routing mechanism controls which controller receives which requests. controller. we need to use a class transformer for this. import { Controller, Post, Body, ParseArrayPipe } from '@nestjs/common'; import { LoggerService } from '. env file, then the validation for max amount and isNumberString should run. The CLI script will ask you what package manager you want to use. The server recognizes it as unique but it simply boils down to the same email address wrt Apr 8, 2019 · 9. 10. Class-validator needs to use the validation decorators we defined for our DTO earlier, so we need to perform this transformation to treat the incoming body as an appropriately decorated object, not just a plain vanilla object. ts file. 7. Create a DTO: In this example, the CreateUserDto class defines three properties ( name, email, and password) and uses Sep 23, 2021 · How can I handle the validation of an array of numbers in form data? Because I am passing data in a form-data format, I can't validate an array of numbers Actually, I don't know how to do it. This is the DTO: import {IsString} from 'class-validator'; export class CreateCompanyDto {. You need to flatten your dependencies. examle : in this case if o. js server-side applications. useGlobalPipes(new ValidationPipe({transform: true})); await app. Since this is still an issue in 2022, here is a solution I came up with that does not require you to change your integer enums to string ones with the keys exactly matching the values. Oct 8, 2022 · Oct 8, 2022. Photo by Juanjo Jaramillo on Unsplash. Actually the problem was that i was feeding the value of an async function msg_validation to a sync function, i Made the catch async as well and added await method before the function call and worked like a charm Jan 8, 2021 · 2. Yes the + in an email is referred to as an alias. otherProperty === 'value' euqal true then the @IsNotEmpty will run otherwise it will not run. That way it will convert it to such an Aug 4, 2020 · 1. You validation will not work correctly due to the same fact. johndoe+imvalid@gmail. @Body () decorator also takes in an optional argument: @Body (path?: string). ts. src/main. We could determine the DTO schema by using TypeScript interfaces, or by simple classes. @ArgsType() export class SomeArgs {. createClient(client, user); Assuming ClientDTO. You can use @ValidateIf conditional validation, this will run other validation if the function return true. You could make your own decorator, especially if this is a repeating pattern in your application or if you expect to need this replicated over more than two properties in the same DTO. This is an interface, so it's not a valid location for a decorator. Minimal reproduction of the problem with instructions Sep 7, 2021 · Class-Validator works based on classes. While I have looked into the IsIn code on class-validator, how to convert this for NestJS is what I am unsure of. To force them to resolve to numbers you can add @Type ( () => Number) so that class-transformer turns them into a number and class-validator then reads the correct value. I have tried it but the data is not getting validated. @IsMongoId({each: true}) @ArrayMinSize(1) ids: ObjectId[] } Share. We talked enough about DTO but before that, we Dec 28, 2022 · Modified 10 months ago. 2" or "sequelize-typescript": "^2. Oct 11, 2019 · I am using class-validator package with NestJS and I am looking to validate an array of objects that need to have exactly 2 objects with the same layout: So far I have: import { IsString, IsNumber } from 'class-validator'; export class AuthParam { @IsNumber() id: number; @IsString() type: string; @IsString() value: string; } Nov 16, 2023 · The ClassSerializerInterceptor only works on returned values from the controller, not errors/exceptions or anything thrown, at least by default. for example we have a product array where we need to validate multiple product objects. Install class-transformer package, if you haven't done it yet. from is the right function to use for the data contained in dto. date(). Nov 14, 2019 · Here, myBodyObject is your plain object that you created for test, like: const myBodyObject = { attribute1: 1, subDto: { name: 'Vincent' } } The plainToInstance () function also applies all the transformations that you have in your DTO. I use the class-validator library for validating the payload. /logger/logger Introduction. enableImplicitConversion option Mar 29, 2019 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Mar 20, 2022 · transform means that the result of plainToClass from class-transformer will be the resulting parameter passed to your route handler. As example in docs say: Oct 18, 2021 · 2. We are using GitHub to track bugs, feature requests, and potential improvements. Jan 19, 2023 · I have the following DTO class in my project: import { IsNotEmpty, IsString } from "class-validator"; export class CreateDomainDTO { @IsString() codigo_website: string; @IsString() website_name: string } I have NestJs default validation pipe applied for my entire project: main. You can use the class-transformer package to do so or you can set the transform option on NestJS's validation pipe. // event. I just did a small change in addBook () function on book. In the user. TypeScript decorators are executed bottom-to-top. This Sep 13, 2023 · Not much to add other than what is described above. Because of that, if I send an empty payload, the validation goes through and then the update operation errors. Sep 19, 2022 · I am working with the DTO validation via IntersectionType, and trying to add in an optional field from another DTO, using PickType composition. Anything that doesn't match will Mar 3, 2020 · The enum value AppState. less('1-12-2022') Here, the validator will check if the date is less than 1 December 2022. Provide details and share your research! But avoid . Asking for help, clarification, or responding to other answers. The use of @IsDateString implies that you expect a date string in ISO8601 format as input. g. However, for this specific case, you could solve it in a more straight-forward manner: @ValidateIf(dto => typeof dto. init(); This then enabled the validation to run properly. For a simple object with a single level of properties, use class-validator decorators to describe the constraints: Controllers. With this knowledge, you can pass 'data' in Jun 23, 2022 · 1. The very first DTO is as following : Jul 19, 2023 · I'm experiencing some issues with nestjs/validation . Let’s make a validation field for the date of birth. Mar 27, 2021 · Unit tests should test that the validation system works, but the conditions of the validation are meta to the "unit". I have two languages file en and fr . when using ValidationPipe, triple-check that you have at least one validation rule. You can use the @Transform decorator from the class-transformer package. So to fix this issue change your import to: import { ObjectId } from "mongodb"; But actually there is an option to validate MongoIds with this: export class MongoIdArrayDto {. I need to make choices for different DTO class (UserCreateDTO, StaffCreateDTO,) for each ROLE (admin, staff, user) on a route. path (or req. enum APP_SETTING {. Check this out: Now our NestJS application will validate User object correctly. Hi friends, In this post, I am going to explain custom validation with the database in NestJS. Nov 14, 2022 · 1 Answer. As there are not much information around how to dynamicly set validation group. As a workaround, you can delay this instance creation to when the DTO runs with specifying the MaxDate argument as an arrow function: @MaxDate ( () => new Date Oct 29, 2021 · I'm trying to validate a request using DTO. I suspect there's something going on with one of those two, but as a workaround, I did something like the following: Mar 8, 2022 · we can validate not only a single field but also can validated an array of objects with DTO in NestJS. Apr 17, 2020 · For validating requests through the incoming dtos, you can use the @UsePipes() decorator provided by NestJS. ts file Sep 27, 2022 · Setting up a local ValidationPipe with the same options does not help. } So in above payload (body) there are some validation requirement as below: If user_type = M then Firstname and Lastname both cannot be Empty. Mar 8, 2022 · 1. When I try to use only the decorator IsNumber() and pass a body with a empty property, validation fails. export Class CreateUserDTO {. This endpoint will now reject any requests where the user object does not match the CreateUserDto schema, including the array of addresses. body. . You'd need some way to tell Prisma to generate class types that relate to the SDL with the class-validator decorators, which at this moment I Oct 1, 2021 · If you intend to keep the @IsDateString decorator, you'll run into new errors when you use it alongside the @Transform decorator ( @Transform ( ( { value }) => new Date (value)) ). I look through the web and the official documentation and I gave a try to Validators (ValidationPipe) but it does not seem to be my need as it validates the endpoint entry params. You can change ValidationPipe exception factory in main. Using @MaxDate (new Date ()) creates a static date when the service is ran as Simon mentioned here. eventService. Feb 18, 2022 · First, we are going to install the NestJS CLI, so open the terminal of your choice and type: $ npm i -g @nestjs/cli. @Body ('path') will return req. However if the value is set to LIVE then only validation for isNumberString should run. Oct 14, 2019 · It cannot, as interfaces only shape your structure or tell something about type. "Start must not be less than 1", "Start must not be greater than 50", "Start must be a number conforming to the specified constraints" Debug payload shows: Description: 'Testing', Start: '25' Oct 4, 2022 · It's not very in NestJS way, but probably the single option to use is validate DTO inside strategy, that your guard is using: import { PassportStrategy } from '@nestjs/passport'; import { Strategy } from 'passport-strategy'; import { validate } from 'class-validator'; import { BadRequestException } from '@nestjs/common'; class YourStrategy extends PassportStrategy(Strategy) { authenticate(req Feb 19, 2018 · When using ValidateNested from class-validator to validate a nested object on a dto, the validation passes successfully with invalid nested objects. Expected behavior. This article focuses on techniques for the implementation of secure and error-proof APIs as much as it could be achieved by controlling API’s input and output payloads. async function bootstrap() {. I created TransformationInterceptor and use. Sharing my draft for this one. With the above setting, every BaseDto 's property is required, and every PartialDto is optional. Jan 7, 2019 · Currently I am using NestJS to build restful api. For that purpose, you need to use the validation pipe of nestjs with whitelist property true. Then import @Type () decorator, and declare the type of validating object with it. com/nestjsx/crud - it shows what you have to do in order to enable validation. 3"). ts file, add the following line below phoneNumber: dob: Joi. The request is an array of objects i. It simply doesn't call the DTO to validate. RUNNING equates to 2 so when you make a request, you should use the numeric value of 2 in your payload: { appState: 2 } In the above case, the class-validator's NotEquals validator will then correctly deny the request with the response containing: "constraints": {. Request payloads that come into the server are just plain JSON objects to start off with. This is what the NestJS documentation says about it - Pipes, similar to exception filters, can be method-scoped, controller-scoped, or global-scoped. Apr 10, 2019 · 1. 3. Share. [{. IsString , May 23, 2021 · 2. Nest's ValidationPipe makes use of both because the incoming object will not be a class instance by default and as such class-validator will have nothing to validate against, no metadata to try Mar 20, 2020 · In order to have instances of classes, and use the methods from the class, you have to explicitly set a mapping like this: const client = ClientDTO. Controllers are responsible for handling incoming requests and returning responses to the client. There is more than once class-validator version installed probably. from(dto); return this. I found a tutorial in DigitalOcean where they also use @Body in the POST request; they leave a the end of the tutorial a repo with the example. Put corresponding logic to fill validation groups. 13. Seems like NestJS Class Validation is not behaving the same in testing environment (with supertest) and in dev/prod environment ( axios, Postman). Jul 26, 2023 · You are using TypeScript decorators (the ones you import from class-validator) to add the validation for your DTOs. @ApiBody ( { type: createDto }) You also need to add another argument in the factory constructor where you pass the entity type, then add @ApiResponse ( { type: entityType }) so swagger knows what the endpoint returns. create(AppModule); app. @Post() async create(@Body() body: UserDTO) {. – A. png etc. @Type ( () => Number) Let's take an example URL address with few query parameters: Jul 27, 2022 · user_co: "Tesla". ts @Post('/:id/orders') async purchaseEventTickets(@Body() createOrderDto: CreateOrderDto): Promise<Order> { return await this. The plus sign is valid for an email address, e. The key here is to understand what @Body () does. Using @Type ( () => Date ) transforms whatever given to a Date object. For instance, I create an AdminCodeDTO, which is basically all my rules for working with the AdminCode in the application, so the number range is consistent, and any other definitions. I. addBook(book): Promise<any> {. com. ts And you should throw RpcException instead of http expception. I am trying to validate data that might have a length of 12 or 32 digits (old system, new system), but not other lengths, so the current @Length() is not Oct 12, 2023 · Because that's not the point of class-transformer. Apr 5, 2020 · When you use Validation pipe you can change that behaviour: app. This example is neither working for me. The validation still sees the Start as a string. These are my files: trivia. test is it. Dec 4, 2021 · 2. await app. This decorator can be applied globally (for the complete project), on individual endpoints. Nov 15, 2023 · I need to use a nested Dto in nest-js project import { Type } from 'class-transformer' import { IsArray, IsNotEmpty, IsString, MaxLength, ArrayMaxSize, ValidateNested, } from ' I would like my DTO fields to be validated automatically following the decorators when I'm mapping it in my mapToDestination() method. The issue is that @MinDate accepts an argument of type Date whereas what Jun 30, 2021 · I would create a DTO class like. It uses progressive JavaScript, is built with and fully supports TypeScript (yet still enables developers to code in pure JavaScript) and combines elements of OOP (Object Oriented Programming), FP (Functional Programming), and FRP (Functional Reactive Programming). Maitre. Jan 15, 2020 · The first step is to allow transformations like this (my bootstrap file as an example): const app = await NestFactory. Normally this would be fine, but query and url parameters always come in as strings, so you either need to add your own @Transform() to make them get transformed properly, or use the transformOptions. For this I created 3 DTO classes: Filename: create-user. For example: Aug 1, 2022 · Aug 1, 2022. NestJS is a web framework that supports natively TypeScript out of the box. Request Body in Postman that works and returns all 4 errors: { "Item": {} } This is missing the FileName and Item. NestJS provides a great way to integrate request validation into your app with some good defaults. Please let me know if I missed to attach any other information in this post. Make sure you are dealing with an instance of CreateUserDto. import { i18nValidationErrorFactory } from 'nestjs-i18n'; app. How to enable DTO validators in NEST JS. Mar 17, 2021 · I found the mistake in my tests. That might take up to a minute. Nov 26, 2018 · The answer is: You don't need to modify your DTO. class TestDto See NestJS docs - Auto Validation NestJS docs - Payload transforming. For this example, I select NPM. 1. createNestApplication(); app. Nest is a framework for building efficient, scalable Node. 1. However, my combined class does not validate the included fields. First of all, create method generateGroups, inside the DTO. I am trying to validate an array of objects using DTO in nestjs. service. Aug 12, 2020 · Bug Report. Nest (NestJS) is a framework for building efficient, scalable Node. thanks. I am running into an interesting edge case that I am not sure if it is a bug or my implementation is faulty. Viewed 4k times. alright, then it's the incoming DTO that needs to be validated, the returned DTO might not need to be validated, but only instantiated with the proper fields you want to expose. In my example I am using field name as group. Simple solution – use @Type () decorator from class-transformer library, and declare numeric field as Number. Apr 2, 2021 · Here is an easy solution. I tried to search a lot but didn't get any answer. "notEquals": "appState should not be equal to 2". Data Transfer Object (DTO) classes are a primary way to define and validate the structure of the data in a NestJS app. Interestingly, we recommend using classes here. e. To use nestjs-i18n in your DTO validation you first need to follow the nestjs instructions. useGlobalPipes(new ValidationPipe({. it only works at controller method and not working with service methods. purchaseEventTickets(createOrderDto); } Jan 30, 2022 · I want to build a custom validation rule through class-validator such that: Check if email address is already taken by a user from the DB; If the email address is already in use, check if the current user (using the value of 'id' property) is using it, if so, validation passes, otherwise, if it is already in use by another user, the validation Nov 16, 2022 · Query ( @Query ()) and URL ( @Param ()) parameters always come in as strings. This works correctly when requesting to NestJS application in dev/prod mode through tools Apr 12, 2021 · Each query parameter comes as string, so it's not possible to validate numeric params correctly. Set this up globally or at the controller method level. useGlobalPipes(new ValidationPipe()) Now I am using class-validator decorators inside my DTO's but nothing is working right now. Aug 15, 2020 · Everything seems to be working properly, I'd just like to have a better grasp of what was really happening. 16. Sep 9, 2020 · 2 Answers. Use plainToinstace () function from the class-transformer package: const ofImportDto = plainToInstance(OfImportDto, importInfo) This will turn your plain test object to the object of the type of your DTO, that is, OfImportDto. Feb 3, 2024 · For file type validation, I tried setting the fileType as image/png, png, . od sc iv se ud sh pt op iq ya