Why does express validator doesn’t run on desired routes?

i am trying to validate request body and path params in post and delete routes respectively

this is my body validation rules :-

const { body, validationResult } = require('express-validator');

const requestBodyValidationRules = [
  body('originalUrl')
    .not()
    .isEmpty()
    .withMessage({
      error: 'Invalid Request Body',
      detail: {
        originalUrl: 'Request Syntax Error! originalUrl parameter is required',
      },
    }),
  body('originalUrl')
    .isURL({
      protocols: ['http', 'https', 'ftp'],
      require_protocol: true,
    })
    .withMessage({
      error: 'Invalid Request Body',
      detail: {
        originalUrl: 'Invalid URL format, please try again!',
      },
    }),
  body('convertedUrlId')
    .optional({ checkFalsy: true })
    .matches(/^[~A-Za-z0-9/./_/-]*$/)
    .withMessage({
      error: 'Invalid characters',
      detail: {
        convertedUrlId:
          'Invalid characters! Only [A-Z],[a-z],[0-9], _ , - , . , ~ are allowed',
      },
    }),
  body('convertedUrlId')
    .optional({ checkFalsy: true })
    .isLength({ min: 5, max: 6 })
    .withMessage({
      error: 'Invalid length',
      detail: {
        convertedUrlId:
          'Invalid Length! Character length >=5 and <7 characters are allowed',
      },
    }),
  (req, res, next) => {
    const errors = validationResult(req);
    console.log('errors', errors);
    if (!errors.isEmpty()) {
      const errorMsg = errors.array()[0].msg;
      return res.status(400).json(errorMsg);
    }
    next();
  },
];
module.exports = requestBodyValidationRules;

this is my param validation rules

const { param, validationResult } = require('express-validator');

const requestParamValidationRules = [
  param('convertedUrlId')
    .isLength({ min: 5, max: 6 })
    .withMessage({
      error: 'Invalid length',
      detail: {
        convertedUrlId:
          'Invalid Length! Character length >=5 and <7 characters are allowed',
      },
    }),
  param('convertedUrlId')
    .matches(/^[~A-Za-z0-9/./_/-]*$/)
    .withMessage({
      error: 'Invalid characters',
      detail: {
        convertedUrlId:
          'Invalid characters! Only [A-Z],[a-z],[0-9], _ , - , . , ~ are allowed',
      },
    }),
  (req, res, next) => {
    const errors = validationResult(req);
    console.log('errors', errors);
    if (!errors.isEmpty()) {
      const errorMsg = errors.array()[0].msg;
      return res.status(400).json(errorMsg);
    }
    next();
  },
];

module.exports = requestParamValidationRules;

this my app.js

app.get(
  '/api-docs',
  swaggerUI.serve,
  swaggerUI.setup(swaggerJsDocs, swaggerOptions)
);
app.get('/:shortUrl', redirectUrlRouter);
app.post(
  '/users/anon-user/urls',
  checkRequestBodyParams,
  fetchTimeStamp,
  convertAnonUrlRouter
);
app.post(
  '/users/auth-user/urls',
  checkRequestBodyParams,
  fetchTimeStamp,
  convertAuthUrlRouter
);
app.get('/users/auth-user/urls', fetchAuthUserHistoryRouter);
app.patch('/users/auth-user/urls', fetchTimeStamp, editConvertedUrlRouter);
app.delete(
  '/users/auth-user/urls/:convertedUrlId',
  checkPathParams,
  deleteConvertedUrlRouter
);

app.use((req, res) => {
  res.status(404).json({ error: 'route not found' });
});

when ever i am trying to post, delete validations are running, why is that so?

Desired behaviour :- for post, request body validations should be running