joi_1.default.validate is not a function

Question

I want to validate my Express routes before calling the controller logic. I use joi and created a validator which is able to validate the Request object against the schema object

import { Request, Response, NextFunction } from 'express'; import joi, { SchemaLike, ValidationError, ValidationResult } from '@hapi/joi'; import { injectable } from 'inversify';  @injectable() export abstract class RequestValidator {     protected validateRequest = (validationSchema: SchemaLike, request: Request, response: Response, next: NextFunction): void => {         const validationResult: ValidationResult<Request> = joi.validate(request, validationSchema, {             abortEarly: false         });          const { error }: { error: ValidationError } = validationResult;          if (error) {             response.status(400).json({                 message: 'The request validation failed.',                 details: error.details             });         } else {             next();         }     } } 

Next I created a deriving class which creates the validationSchema and calls the validateRequest method. For the sake of simplicity I will show the "deleteUserById" validation

import { Request, Response, NextFunction } from 'express'; import joi, { SchemaLike } from '@hapi/joi'; import { injectable } from 'inversify';  import { RequestValidator } from './RequestValidator';  @injectable() export class UserRequestValidator extends RequestValidator {     public deleteUserByIdValidation = async (request: Request, response: Response, next: NextFunction): Promise<void> => {         const validationSchema: SchemaLike = joi.object().keys({             params: joi.object().keys({                 id: joi.number().required(),             })         });          this.validateRequest(validationSchema, request, response, next);     } } 

Important note: I create the SchemaLike that way because some routes might have params, body, query which need to get validated in one run.

When calling the Route

DELETE /users/1

the validation always fails. I get this error

UnhandledPromiseRejectionWarning: TypeError: joi_1.default.validate is not a function

The error occurs with every validation, whether called correctly or not. Does someone know how to fix it?

Answer 1

You fix it by changing joi.validate(request, validationSchema to validationSchema.validate(request As joi.validate() is no longer supported in v16. It is clearly documented in the API docs and release notes.

Answer 2

Update version of joi doesn't work with Joi.validate(req.body,schema); No need to use the object separately. Use this as following. It Worked for me smoothly. Do let me know if I am wrong at anything:

const Joi = require('@hapi/joi');  const schema = Joi.object({     name:Joi.string().min(3).required(),     email:Joi.string().min(4).required().email(),     password:Joi.string().min(6).required() });      router.post('/register', async (req,res) => {       //updated joi         // This is a shorter version     const { error } = schema.validate(req.body);      // Error in response      res.send(error.details[0].message);       // WORKING WITH DEPRECATED VERSION     // const Validation = Joi.validate(req.body,schema);     // res.send(Validation);