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express-validator custom validation

Readul Ahmed answered on April 14, 2022 Popularity 3/10 Helpfulness 1/10

answer express-validator custom validation

related custom validator express validator

express-validator custom validation

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

const validationSchema = checkSchema({
  password: {
    isLength: {
      options: { min: 5 },
      errorMessage: 'Password must be at least 5 characters long',
    },
    // Custom validation: check if password confirmation matches the password
    custom: {
      options: (value, { req }) => {
        if (value !== req.body.confirmPassword) {
          throw new Error('Password confirmation does not match password');
        }
        return true;
      },
    },
  },
  age: {
    // Custom validation: check if the age is an even number
    custom: {
      options: (value) => {
        if (value % 2 !== 0) {
          throw new Error('Age must be an even number');
        }
        return true;
      },
    },
  },
});

app.post('/validate', validationSchema, (req, res) => {
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(400).json({ errors: errors.array() });
  }
  res.send('Validation passed!');
});

Popularity 3/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: express-validator javascript validation

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Contributed on Sep 03 2024

Readul Ahmed

0 Answers Avg Quality 2/10

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custom validator express validator

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body("thumbnail_file").custom(async (value, { req }) => {
  const thumbnailFile = req.files && req.files.thumbnail_file;
  if (!thumbnailFile) {
    return true;
  } else if (Array.isArray(thumbnailFile)) {
    throw new Error("Only one thumbnail file is allowed.");
  }
  if (
    thumbnailFile.mimetype !== "image/png" &&
    thumbnailFile.mimetype !== "image/jpg" &&
    thumbnailFile.mimetype !== "image/jpeg"
  ) {
    throw new Error(
      "Only .png, .jpg and .jpeg image formats are allowed for thumbnail file."
    );
  }
}),

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: express-validator express-validato

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Contributed on Apr 14 2022

Ali Raza

0 Answers Avg Quality 2/10

express-validator custom validation

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