express-validator all rules

Readul Ahmed answered on September 3, 2024 Popularity 2/10 Helpfulness 1/10

answer express-validator all rules

express-validator all rules

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

const validationSchema = checkSchema({
  fieldName1: {
    // 1. Checks if the value exists in the request.
    exists: { options: { checkFalsy: true } },

    // 2. Checks if the value is an array.
    isArray: true,

    // 3. Checks if the value is a boolean.
    isBoolean: true,

    // 4. Checks if the value is a valid date string.
    isDate: true,

    // 5. Checks if the value is a valid email.
    isEmail: { errorMessage: 'Invalid email address' },

    // 6. Checks if the value is empty.
    isEmpty: true,

    // 7. Checks if the value is a float. You can also specify a range.
    isFloat: { options: { min: 0, max: 10 }, errorMessage: 'Must be a float between 0 and 10' },

    // 8. Checks if the value is in a given array.
    isIn: { options: [['value1', 'value2']], errorMessage: 'Invalid value' },

    // 9. Checks if the value is an integer. You can specify a range.
    isInt: { options: { min: 0, max: 100 }, errorMessage: 'Must be an integer between 0 and 100' },

    // 10. Checks if the value is a valid JSON string.
    isJSON: true,

    // 11. Checks if the value's length falls in a specified range.
    isLength: { options: { min: 5, max: 10 }, errorMessage: 'Must be between 5 and 10 characters long' },

    // 12. Checks if the value is a numeric string.
    isNumeric: true,

    // 13. Checks if the value is an object.
    isObject: true,

    // 14. Checks if the value is a string.
    isString: true,

    // 15. Checks if the value is a valid URL.
    isURL: true,

    // 16. Checks if the value is a valid UUID (v1 to v5).
    isUUID: true,

    // 17. Checks if the value matches a regex pattern.
    matches: { options: /^[a-zA-Z0-9]+$/, errorMessage: 'Invalid format' },

    // 18. Negates the result of the validation.
    not: { isEmpty: true },

    // 19. Checks if the value is not empty.
    notEmpty: true,

    // 20. Marks the validation as optional, skipping validation if the value is not present.
    optional: true,

    // 21. Trims whitespace from both ends of the string.
    trim: true,

    // 22. Replaces `<`, `>`, `&`, `'`, and `"` with their corresponding HTML entities.
    escape: true,

    // 23. Normalizes email addresses (lowercases the domain, etc.).
    normalizeEmail: true,

    // 24. Converts the value to a boolean.
    toBoolean: true,

    // 25. Converts the value to a date.
    toDate: true,

    // 26. Converts the value to a float.
    toFloat: true,

    // 27. Converts the value to an integer.
    toInt: true,
  },
  fieldName2: {
    // Additional field validation can be defined here.
  },
  // Add more fields as needed.
});

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 2/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: express express-validator javascript rules

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Contributed on Sep 03 2024

Readul Ahmed

0 Answers Avg Quality 2/10

express-validator all rules

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