@httpx/plain-object v2.0.9

@httpx/plain-object

Fast and lightweight (~80B) functions to check or assert that a value is a plain object.

A plain object is a basic JavaScript object, such as {}, { data: [] }, new Object() or Object.create(null).

See how it compares to other libraries.

Install

$ npm install @httpx/plain-object
$ yarn add @httpx/plain-object
$ pnpm add @httpx/plain-object

Features

• 👉  Provide isPlainObject and assertPlainObject functions.
• 🦄  Convenience PlainObject typescript typings.
• 🚀  Faster than most alternatives, see benchmarks.
• 📐  Lightweight (starts at ~80B)
• 🛡️  Tested on node 18-22, browser, cloudflare workers and runtime/edge.
• 🙏  Works cross-realms (node:vm runInNewContext,...)
• 🗝️  Available in ESM and CJS formats.

Documentation

👉 Official website or GitHub Readme

Usage

isPlainObject

import { isPlainObject } from '@httpx/plain-object';

// ✅👇 True
isPlainObject({ });                       // ✅
isPlainObject({ key: 'value' });          // ✅
isPlainObject({ key: new Date() });       // ✅
isPlainObject(new Object());              // ✅
isPlainObject(Object.create(null));       // ✅
isPlainObject({ nested: { key: true} });  // ✅
isPlainObject(new Proxy({}, {}));         // ✅
isPlainObject({ [Symbol('tag')]: 'A' });  // ✅

// ✅👇 (node context, workers, ...)
const runInNewContext = await import('node:vm').then(
    (mod) => mod.runInNewContext
);
isPlainObject(runInNewContext('({})'));   // ✅

// ✅👇 Static built-in classes are treated as plain objects
//       check for `isStaticBuiltInClass` to exclude if needed

isPlainObject(Math);                // ✅
isPlainObject(JSON);                // ✅
isPlainObject(Atomics);             // ✅

// ❌👇 False

class Test { };
isPlainObject(new Test())           // ❌
isPlainObject(10);                  // ❌
isPlainObject(null);                // ❌
isPlainObject('hello');             // ❌
isPlainObject([]);                  // ❌
isPlainObject(new Date());          // ❌
isPlainObject(new Uint8Array([1])); // ❌
isPlainObject(Buffer.from('ABC'));  // ❌
isPlainObject(Promise.resolve({})); // ❌
isPlainObject(Object.create({}));   // ❌
isPlainObject(new (class Cls {}));  // ❌
isPlainObject(globalThis);          // ❌,

assertPlainObject

import { assertPlainObject } from '@httpx/plain-object';
import type { PlainObject } from '@httpx/plain-object';

function fn(value: unknown) {

    // 👇 Throws `new TypeError('Not a PlainObject')` if not a plain object
    assertPlainObject(value);

    // 👇 Throws `new TypeError('Custom message')` if not a plain object
    assertPlainObject(value, 'Custom message');

    // 👇 Throws custom error if not a plain object
    assertPlainObject(value, () => {
        throw new HttpBadRequest('Custom message');
    });
    
    return value;
}

try {
    const value = fn({ key: 'value' });
    // ✅ Value is known to be PlainObject<unknown>
    assertType<PlainObject>(value);
} catch (error) {
    console.error(error);
}

isStaticBuiltInClass

info: Since v2.0.0

Since v2.0.0, isPlainObject will accept static built-in classes as plain objects (Math, JSON, Atomics). If you need to exclude them, a new typeguard has been created isStaticBuiltInClass.

import { isPlainObject, isStaticBuiltInClass } from '@httpx/plain-object';
const v = Math; // or Atomics or JSON
if (isPlainObject(v) && !isStaticBuiltInClass(v)) {
    console.log('v is a plain object but not a static built-in class');
}

PlainObject type

Generic

ìsPlainObject and assertPlainObject accepts a generic to provide type autocompletion. Be aware that no runtime check are done. If you're looking for runtime validation, check zod, valibot or other alternatives.

import { isPlainObject } from '@httpx/plain-object';
import type { PlainObject } from '@httpx/plain-object';

type CustomType = {
    id: number;
    data?: {
        test: string[];
        attributes?: {
            url?: string | null;
            caption?: string | null;
            alternativeText?: string | null;
        } | null;
    } | null;
};

const value = { id: 1 } as unknown;

if (isPlainObject<CustomType>(value)) {
   // ✅ Value is a PlainObject with typescript autocompletion
   // Note that there's no runtime checking of keys, so they are
   // `unknown | undefined`. They will require unsing `?.` to access. 
    
  const url = value?.data?.attributes?.url; // autocompletion works
  // ✅ url is `unknown | undefined`, so in order to use it, you'll need to
  //    manually check for the type.
  if (typeof url === 'string') {
      console.log(url.toUpperCase());
  }
}

PlainObject

import { assertPlainObject } from '@httpx/plain-object';
import type { PlainObject } from '@httpx/plain-object';

function someFn(value: PlainObject) {
  //    
}

const value = { key: 'value' } as unknown;
assertPlainObject(value);
someFn(value)

Benchmarks

Performance is continuously monitored thanks to codspeed.io.

 RUN  v3.0.4 /home/sebastien/github/httpx/packages/plain-object


 ✓ bench/comparative.bench.ts > Compare calling isPlainObject with 110x mixed types values 5684ms
     name                                                       hz     min     max    mean     p75     p99    p995    p999     rme  samples
   · "@httpx/plain-object": `isPlainObject(v)`        1,832,016.65  0.0004  0.4702  0.0005  0.0005  0.0009  0.0011  0.0018  ±0.49%   916009   fastest
   · "is-plain-obj":"4.1.0": 'isPlainObj(v)'          1,565,569.05  0.0005  0.5879  0.0006  0.0006  0.0014  0.0015  0.0018  ±0.53%   782785
   · "@sindresorhus/is":"7.0.1": 'is.plainObject(v)'    944,124.29  0.0008  0.5417  0.0011  0.0010  0.0017  0.0023  0.0032  ±0.38%   472063
   · "es-toolkit":"1.31.0": 'isPlainObject(v)'        1,432,993.92  0.0005  0.4105  0.0007  0.0007  0.0012  0.0016  0.0028  ±0.56%   716497
   · "redux":"5.0.1": 'isPlainObject(v)'                651,167.40  0.0012  0.7868  0.0015  0.0015  0.0021  0.0028  0.0071  ±0.55%   325584
   · "is-plain-object":"5.0.0": 'isPlainObject(v)'      828,601.23  0.0010  0.7233  0.0012  0.0012  0.0022  0.0028  0.0106  ±0.68%   414301
   · lodash-es:"4.17.21": '_.isPlainObject(v)'           23,543.74  0.0332  0.6199  0.0425  0.0399  0.1037  0.1168  0.2867  ±0.80%    11772   slowest
                                                                                                                                                    
 BENCH  Summary                                                                                                                                     
                                                                                                                                                    
  "@httpx/plain-object": `isPlainObject(v)` - bench/comparative.bench.ts > Compare calling isPlainObject with 110x mixed types values               
    1.17x faster than "is-plain-obj":"4.1.0": 'isPlainObj(v)'                                                                                       
    1.28x faster than "es-toolkit":"1.31.0": 'isPlainObject(v)'                                                                                     
    1.94x faster than "@sindresorhus/is":"7.0.1": 'is.plainObject(v)'                                                                               
    2.21x faster than "is-plain-object":"5.0.0": 'isPlainObject(v)'
    2.81x faster than "redux":"5.0.1": 'isPlainObject(v)'
    77.81x faster than lodash-es:"4.17.21": '_.isPlainObject(v)'

See benchmark file for details.

Bundle size

Bundle size is tracked by a size-limit configuration

For CJS usage (not recommended) track the size on bundlephobia.

Compatibility

For older browsers: most frontend frameworks can transpile the library (ie: nextjs...)

Comparison with other libraries

redux/isPlainObject

100% compatible see tests.

@sindresorhus/is-plain-obj

This library wouldn't be possible without @sindresorhus is-plain-obj. Notable differences:

• Slightly faster (10%)
• ESM and CJS formats.
• Named export.
• Smaller bundle size.
• Provide a PlainObject type and assertPlainObject function.
• Typescript convenience PlainObject type.

Since v2, it diverges from is-plain-obj by

• Static built-in classes are considered as plain objects (use isStaticBuiltInClass to exclude).
• [Symbol.iterator] is considered as a valid property for plain objects.
• [Symbol.toStringTag] is considered as a valid property for plain objects.`

Contributors

Contributions are welcome. Have a look to the CONTRIBUTING document.

Sponsors

If my OSS work brightens your day, let's take it to new heights together! Sponsor, coffee, or star – any gesture of support fuels my passion to improve. Thanks for being awesome! 🙏❤️

Special thanks to

License

MIT © Sébastien Vanvelthem and contributors.