TypeScript Gives an Error while using Zod "No overload matches this call.

TypeScript Gives an Error while using Zod “No overload matches this call.”

If you are using TypeScript and encounter the error message “No overload matches this call” while using Zod, don’t worry, you’re not alone. This error usually occurs when there is a mismatch between the expected types and the actual values being passed to Zod’s validation functions.

In this blog post, we will explore a few possible solutions to resolve this error and ensure smooth integration of Zod with TypeScript.

Solution 1: Specify the Correct Type

One common reason for this error is that the type of the value being passed to Zod’s validation function does not match the expected type. To fix this, make sure to specify the correct type explicitly.


import { z } from 'zod';

const schema = z.string();

const value = 123; // Incorrect type

const validationResult = schema.parse(value); // Error: No overload matches this call

To resolve the error, update the value to match the expected type:


const value = "Hello, TypeScript!"; // Correct type

const validationResult = schema.parse(value); // No error

Solution 2: Use Type Assertion

If the type of the value cannot be changed or updated, you can use type assertion to explicitly tell TypeScript the expected type.


const value = 123; // Incorrect type

const validationResult = schema.parse(value as unknown as string); // Type assertion

console.log(validationResult); // No error

By using type assertion, you inform TypeScript that the value should be treated as a string, even though its actual type is different.

Solution 3: Use Zod’s coercion functions

Zod provides coercion functions that can be used to automatically convert values to the expected type. These functions can help resolve the “No overload matches this call” error.


import { z } from 'zod';

const schema = z.string();

const value = 123; // Incorrect type

const coercedValue = schema.coerce(value); // Coerce the value to the expected type

const validationResult = schema.parse(coercedValue); // No error

By using the coerce function, Zod will attempt to convert the value to the expected type before performing the validation.

These are a few possible solutions to resolve the “No overload matches this call” error while using Zod with TypeScript. By ensuring the correct types are used and leveraging Zod’s coercion functions, you can overcome this error and enjoy seamless integration of Zod’s powerful validation capabilities in your TypeScript projects.

Remember to always double-check your types and ensure they align with the expected types specified by Zod’s validation functions. Happy coding!

TypeScript Gives an Error while using Zod “No overload matches this call.