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Is it possible to validate single route parameter?

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2

Let's say I have following route:

companies/companyId/departments/departmentId/employees

Is it possible to validate both resources ids (companyId, departmentId) separately? I've tried following but it's not working.

class ResourceId 
 @IsNumberString()
 @StringNumberRange(...) // my custom validator
 id: number;


@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 

I have multiple cases when there is more than one parameter in the single route. I would not like to create separate validation class for every route. Is there a way to handle this problem in a different way?

javascript node.js typescript nestjs class-validator

share|improve this question

edited Mar 27 at 22:30

Kim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

asked Mar 27 at 19:24

bloo79bloo79

2577 bronze badges

add a comment | 

2

Let's say I have following route:

companies/companyId/departments/departmentId/employees

Is it possible to validate both resources ids (companyId, departmentId) separately? I've tried following but it's not working.

class ResourceId 
 @IsNumberString()
 @StringNumberRange(...) // my custom validator
 id: number;


@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 

I have multiple cases when there is more than one parameter in the single route. I would not like to create separate validation class for every route. Is there a way to handle this problem in a different way?

javascript node.js typescript nestjs class-validator

share|improve this question

edited Mar 27 at 22:30

Kim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

asked Mar 27 at 19:24

bloo79bloo79

2577 bronze badges

add a comment | 

Let's say I have following route:

companies/companyId/departments/departmentId/employees

Is it possible to validate both resources ids (companyId, departmentId) separately? I've tried following but it's not working.

class ResourceId 
 @IsNumberString()
 @StringNumberRange(...) // my custom validator
 id: number;


@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 

I have multiple cases when there is more than one parameter in the single route. I would not like to create separate validation class for every route. Is there a way to handle this problem in a different way?

javascript node.js typescript nestjs class-validator

share|improve this question

edited Mar 27 at 22:30

Kim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

asked Mar 27 at 19:24

bloo79bloo79

2577 bronze badges

companies/companyId/departments/departmentId/employees

class ResourceId 
 @IsNumberString()
 @StringNumberRange(...) // my custom validator
 id: number;


@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 

share|improve this question

edited Mar 27 at 22:30

Kim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

asked Mar 27 at 19:24

bloo79bloo79

2577 bronze badges

share|improve this question

edited Mar 27 at 22:30

Kim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

asked Mar 27 at 19:24

bloo79bloo79

2577 bronze badges

edited Mar 27 at 22:30

Kim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

edited Mar 27 at 22:30

Kim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

asked Mar 27 at 19:24

bloo79bloo79

2577 bronze badges

asked Mar 27 at 19:24

bloo79bloo79

2577 bronze badges

1 Answer
1

active

oldest

votes

1

The problem is that you have a plain string here. For the validation with class-validator to work, you must instantiate a class, in your case ResourceId. The built-in ValidationPipe expects the value to be id: '123' instead '123' to be able to transform it automatically. But you can easily create your own validation pipe, that does this extra transformation.

export class ParamValidationPipe implements PipeTransform 
 async transform(value, metadata: ArgumentMetadata) 
 if (metadata.type === 'param') 
 // This is the relevant part: value -> id: value 
 const valueInstance = plainToClass(metadata.metatype, id: value );
 const validationErrors = await validate(valueInstance);
 if (validationErrors.length > 0) 
 throw new BadRequestException(validationErrors, 'Invalid route param');
 
 return valueInstance;
 else 
 return value;
 
 

You can then use it on your controller:

@UsePipes(ParamValidationPipe)
@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 
 return `id1: $companyId.id, id2: $departmentId.id`;

share|improve this answer

edited Mar 29 at 13:58

answered Mar 27 at 22:30

Kim KernKim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can also use class-transformer-validator to do all the transformation, validation and checking the error list steps in one call :)
  
  – quezak
  Mar 29 at 13:49
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Good point. :-) I'm not gonna change my answer because adding the notes about installing another package would make it even longer, but I think it's a very useful comment.
  
  – Kim Kern
  Mar 29 at 13:53
  

  
  
  
  

add a comment | 

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1

The problem is that you have a plain string here. For the validation with class-validator to work, you must instantiate a class, in your case ResourceId. The built-in ValidationPipe expects the value to be id: '123' instead '123' to be able to transform it automatically. But you can easily create your own validation pipe, that does this extra transformation.

export class ParamValidationPipe implements PipeTransform 
 async transform(value, metadata: ArgumentMetadata) 
 if (metadata.type === 'param') 
 // This is the relevant part: value -> id: value 
 const valueInstance = plainToClass(metadata.metatype, id: value );
 const validationErrors = await validate(valueInstance);
 if (validationErrors.length > 0) 
 throw new BadRequestException(validationErrors, 'Invalid route param');
 
 return valueInstance;
 else 
 return value;
 
 

You can then use it on your controller:

@UsePipes(ParamValidationPipe)
@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 
 return `id1: $companyId.id, id2: $departmentId.id`;

share|improve this answer

edited Mar 29 at 13:58

answered Mar 27 at 22:30

Kim KernKim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can also use class-transformer-validator to do all the transformation, validation and checking the error list steps in one call :)
  
  – quezak
  Mar 29 at 13:49
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Good point. :-) I'm not gonna change my answer because adding the notes about installing another package would make it even longer, but I think it's a very useful comment.
  
  – Kim Kern
  Mar 29 at 13:53
  

  
  
  
  

add a comment | 

1

The problem is that you have a plain string here. For the validation with class-validator to work, you must instantiate a class, in your case ResourceId. The built-in ValidationPipe expects the value to be id: '123' instead '123' to be able to transform it automatically. But you can easily create your own validation pipe, that does this extra transformation.

export class ParamValidationPipe implements PipeTransform 
 async transform(value, metadata: ArgumentMetadata) 
 if (metadata.type === 'param') 
 // This is the relevant part: value -> id: value 
 const valueInstance = plainToClass(metadata.metatype, id: value );
 const validationErrors = await validate(valueInstance);
 if (validationErrors.length > 0) 
 throw new BadRequestException(validationErrors, 'Invalid route param');
 
 return valueInstance;
 else 
 return value;
 
 

You can then use it on your controller:

@UsePipes(ParamValidationPipe)
@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 
 return `id1: $companyId.id, id2: $departmentId.id`;

share|improve this answer

edited Mar 29 at 13:58

answered Mar 27 at 22:30

Kim KernKim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can also use class-transformer-validator to do all the transformation, validation and checking the error list steps in one call :)
  
  – quezak
  Mar 29 at 13:49
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Good point. :-) I'm not gonna change my answer because adding the notes about installing another package would make it even longer, but I think it's a very useful comment.
  
  – Kim Kern
  Mar 29 at 13:53
  

  
  
  
  

add a comment | 

The problem is that you have a plain string here. For the validation with class-validator to work, you must instantiate a class, in your case ResourceId. The built-in ValidationPipe expects the value to be id: '123' instead '123' to be able to transform it automatically. But you can easily create your own validation pipe, that does this extra transformation.

export class ParamValidationPipe implements PipeTransform 
 async transform(value, metadata: ArgumentMetadata) 
 if (metadata.type === 'param') 
 // This is the relevant part: value -> id: value 
 const valueInstance = plainToClass(metadata.metatype, id: value );
 const validationErrors = await validate(valueInstance);
 if (validationErrors.length > 0) 
 throw new BadRequestException(validationErrors, 'Invalid route param');
 
 return valueInstance;
 else 
 return value;
 
 

You can then use it on your controller:

@UsePipes(ParamValidationPipe)
@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 
 return `id1: $companyId.id, id2: $departmentId.id`;

share|improve this answer

edited Mar 29 at 13:58

answered Mar 27 at 22:30

Kim KernKim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

export class ParamValidationPipe implements PipeTransform 
 async transform(value, metadata: ArgumentMetadata) 
 if (metadata.type === 'param') 
 // This is the relevant part: value -> id: value 
 const valueInstance = plainToClass(metadata.metatype, id: value );
 const validationErrors = await validate(valueInstance);
 if (validationErrors.length > 0) 
 throw new BadRequestException(validationErrors, 'Invalid route param');
 
 return valueInstance;
 else 
 return value;
 
 

@UsePipes(ParamValidationPipe)
@Get(':companyId/departments/:departmentId/employees')
getEmployees(
 @Param('companyId') companyId: ResourceId,
 @Param('departmentId') departmentId: ResourceId,
) 
 return `id1: $companyId.id, id2: $departmentId.id`;

share|improve this answer

edited Mar 29 at 13:58

answered Mar 27 at 22:30

Kim KernKim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

answered Mar 27 at 22:30

Kim KernKim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges

answered Mar 27 at 22:30

Kim KernKim Kern

15.1k66 gold badges4343 silver badges6969 bronze badges