verify

Automated verification for forms, fields, and objects. Eliminate common edge cases. Automate common type checks and validation checks.

Sections

1. Rulesets
   1. lessThan
   2. greaterThan
   3. between
   4. equalTo

Rulesets

// Create a ruleset using the expected type to be verified
const ruleset = new Ruleset<number>();
// Get a 'value' object from ruleset used to create rules.
const value = ruleset.value();

lessThan

// Validate whether number input less than 0.
const ruleset = new Ruleset<number>();
const value = ruleset.value();
ruleset.add(value.must.be.between(0, 5));

// Tests input against all rules in ruleset.
const result = await ruleset.verify(-99);

// Validate whether number input is not less than 0.
const ruleset = new Ruleset<number>();
const value = ruleset.value();
ruleset.add(value.must.not.be.lessThan(0));

// Tests input against all rules in ruleset.
const result = await ruleset.verify(1);

between

// Validate whether number input is greater than 100.
const ruleset = new Ruleset<number>();
const value = ruleset.value();
ruleset.add(value.must.be.greaterThan(100));

// Tests input against all rules in ruleset.
const result = await ruleset.verify(20000);

greaterThan

// Validate whether number input is greater than 100.
const ruleset = new Ruleset<number>();
const value = ruleset.value();
ruleset.add(value.must.be.greaterThan(100));

// Tests input against all rules in ruleset.
const result = await ruleset.verify(20000);

equalTo

// Value must be equal to this
const ruleset = new Ruleset<number>();
const value = ruleset.value();
ruleset.add(value.must.be.equalTo(100));

// Tests input against all rules in ruleset.
const result = await ruleset.verify(100);

number values

// Validate whether number input is exactly 10.
const ruleset = new Ruleset<number>();
const value = ruleset.value();
ruleset.add(value.must.be.equalTo(10));

// Tests input against all rules in ruleset.
const result = await ruleset.verify(0);

string values

// Validate whether string input matches 'one'.
const ruleset = new Ruleset<string>();
const value = ruleset.value();
ruleset.add(value.must.be.equalTo('one'));

// Tests input against all rules in ruleset.
const result = await ruleset.verify('valuehere');

Checks

verifyArray

Check that value is a valid array.

verifyArrayEmpty

Check that value is a valid array and empty.

verifyBigInt

Check that value is a BigInt type, is an integer, and is finite.

verifyBoolean

Check that value has a boolean value true or false. Does not use type coercion.

verifyStringId

Configurable validator for string-based ID values. Accepts a number of boundary condition parameters including min/max length, allow empty, allow nulls, auto-trim, etc.

verifyUrl

Configurable validator for URL values.

Rule Validators

Rule validators check for a single condition using one or more function arguments and return a strict boolean value true or false.

Maths

powOf

Determine if value is a power of exponent.

Use cases

• User uploaded image dimensions.
• Texture sizes with size requirements, e.g. the power of 2 rule.
• Cases where inputs may have non-number or non-finite values.
• Performs type and bound checks on values before attempting to use math functions and returns false if the call would otherwise fail.

// Determine if 0 is a power of 1.
const result = powOf(0, 1);

// Determine if 100 is a power of 10.
const result = powOf(100, 10);

Collections

isArrayEmpty

Determine if value is an array and if so, whether it's empty. Does not throw. Returns false in all cases where value is not an array.

const value: string[] = ['one'];

// Result is FALSE.
const result = isArrayEmpty(value);

// Result is FALSE.
const result = isArrayEmpty(null);

// Result is FALSE.
const result = isArrayEmpty({});

TypeScript Equivalent

const value: unknown = '081408';
const result = Array.isArray(value) && value.length === 0;

Package

@toreda/verify on NPM.

Source Code

@toreda/verify source on Github.

Contributions

Bug reports, comments, and pull requests are welcome.

Legal

License

MIT © Toreda, Inc.

Copyright

Copyright © 2019 - 2025 Toreda, Inc. All Rights Reserved.

Github

https://github.com/toreda

Website

https://www.toreda.com