Checks if path is a direct or inherited property of object. Part of Lodash Object (stable — not deprecated). Like a normal property lookup: prototype-chain keys count. For own-only checks, use _.has.
Pass the object and path or keys shown below. Check whether the helper mutates or returns a new object.
Call _.hasIn. Start with this line.
_.hasIn(object, path)| Call | What it does |
|---|---|
_.hasIn(object, path) | Primary signature. |
_.hasIn(object) | Work with an object’s keys, values, or paths. |
Prefer import hasIn from "lodash/hasIn" when you want a smaller bundle.
_.hasIn(object, path)| Parameter | Description |
|---|---|
| object | Required. Object to query |
| path | Required. String or array path to check |
| Return Value | Description |
|---|---|
| * | true if path exists (own or inherited) |
Prototype properties count for hasIn.
var object = _.create({ a: _.create({ b: 2 }) });
console.log(_.hasIn(object, "a")); // trueobject inherits a — it is not own.a → true._.has(object, 'a') would be false.Inherited nested chains work with both path styles.
var object = _.create({ a: _.create({ b: 2 }) });
console.log(_.hasIn(object, "a.b")); // true
console.log(_.hasIn(object, ["a", "b"])); // truea, then inherited b.'a.b' → true.['a', 'b'] → same result.A path that never exists still returns false.
var object = _.create({ a: _.create({ b: 2 }) });
console.log(_.hasIn(object, "b")); // falseb on the object or prototypes.a.b exists — bare b does not.false — matches the official docs._.has vs _.hasInSame inherited object, different answers.
var object = _.create({ a: _.create({ b: 2 }) });
console.log(_.has(object, "a")); // false
console.log(_.hasIn(object, "a")); // truefalse for inherited a.true.has for “did this object define it?”hasIn for “can I read it somehow?”hasIn is a superset — own keys still work.
var object = { a: { b: 2 } };
console.log(_.hasIn(object, "a.b")); // true
console.log(_.has(object, "a.b")); // truea and b are direct properties.hasIn and has return true.has; switch to hasIn when prototypes matter._.hasIn is a Lodash Object helper available in 4.x (and earlier builds). It runs anywhere Lodash runs — modern browsers (via CDN or bundle) and Node.js / Bun / Deno with npm install lodash. Native key in object covers a single key including inheritance; Lodash adds nested path support.
Available in [email protected] full builds and the lodash/hasIn modular import. Works in evergreen browsers and current Node LTS when Lodash is installed.
Bottom line: Safe for production once Lodash is on the page or in your bundle. Prefer import hasIn from "lodash/hasIn" for smaller builds. Use _.has when only own properties should count.
Create an object with keys and values swapped.
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