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omit()

omit<T, K>(object, keys): Omit<T, K>

omit<T>(object, keys): Partial<T>

Creates a new object with specified keys omitted.

note

Overload with PropertyKey[] returns Partial<T> for dynamic keys.

Type Parameters​

T: T extends Record<PropertyKey, any>​

The type of the input object.

K: K extends string | number | symbol​

The type of the keys to omit.

Parameters​

Overload 1:

object: T​

The object to omit keys from.

keys: readonly K[]​

Array of keys to omit.

Overload 2:

object: T​

The object to omit keys from.

keys: readonly PropertyKey[]​

Array of keys to omit.

Returns: Omit<T, K>​

A new object without the specified keys.

See Also​

pick

Since​

2.0.0

Performance​

O(n + k) time & space where n is object size, k is number of keys to omit. Uses spread operator then delete operations.

Also known as​

omit (Lodash, es-toolkit, Remeda, Radashi, Ramda, Effect, Modern Dash) · ❌ (Antfu)

Example​

const obj = { a: 1, b: 2, c: 3 };

omit(obj, ['b']);      // => { a: 1, c: 3 }
omit(obj, ['a', 'c']); // => { b: 2 }

// Remove sensitive data
const user = { id: 1, name: 'John', password: 'secret' };
omit(user, ['password']); // => { id: 1, name: 'John' }

// Dynamic keys (Object.keys)
const keysToOmit = Object.keys({ b: true, c: true });
omit(obj, keysToOmit); // => { a: 1 }

How it works?​

Creates a new object excluding the specified keys.

Exclusion Process​

Sensitive Data Removal​

Use Cases​

Exclude specific properties 📌​

Create a shallow copy of an object excluding specified keys. Essential for efficient shallow removals or removing sensitive data.

const publicUser = omit(user, ['password', 'secretToken']);
sendToClient(publicUser);

Sanitize internal fields​

Remove framework-specific or internal properties before serialization. Useful for cleaning ORM entities or decorated objects.

const cleanEntity = omit(dbRecord, ['_id', '__v', 'createdAt']);
return JSON.stringify(cleanEntity);

Filter invalid keys​

Remove known invalid or deprecated keys from an object hash.

const cleanParams = omit(params, ['legacyParam1', 'unused_flag']);

Strip undefined values before API call​

Remove undefined or null fields from a partial form before sending to an API. Very common with optional form fields where you don't want to send empty values.

const formData = { name: "Alice", bio: undefined, avatar: null, email: "alice@example.com" };

const cleanPayload = omit(formData, ["bio", "avatar"]);
// => { name: "Alice", email: "alice@example.com" }
await api.updateProfile(cleanPayload);

Remove non-DOM props before spreading in React​

Strip custom props that shouldn't be forwarded to the underlying HTML element. Essential pattern for React wrapper components using spread props.

interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
  variant: "primary" | "secondary";
  isLoading: boolean;
}

function Button({ variant, isLoading, ...rest }: ButtonProps) {
  // variant and isLoading are already destructured,
  // but for components that forward all props:
  const domProps = omit(props, ["variant", "isLoading", "onAnalyticsClick"]);
  return <button {...domProps} />;
}

Strip tracking params before sharing URLs​

Remove UTM and tracking parameters from URLs before users share them. Essential for privacy-focused apps and clean link sharing.

const rawParams = { page: "products", category: "shoes", utm_source: "google", utm_medium: "cpc", fbclid: "abc123" };

const cleanParams = omit(rawParams, ["utm_source", "utm_medium", "utm_campaign", "fbclid", "gclid"]);
// => { page: "products", category: "shoes" }

const cleanUrl = `${baseUrl}?${new URLSearchParams(cleanParams)}`;