For an ordinary, non-null object, check Object.keys(value).length === 0. This returns true when the object has no own, enumerable, string-keyed properties. Guard against null and undefined first, and use a different check for symbols, non-enumerable properties, or Map and Set contents.
Check an ordinary object with Object.keys()
Object.keys() returns the names of an object’s own enumerable string-keyed properties. If that array has length zero, there are none of those properties:
function isEmptyObject(value: object): boolean {
return Object.keys(value).length === 0;
}
const result = isEmptyObject({}); // trueThis is a JavaScript runtime check, even when called from TypeScript. The TypeScript Handbook describes object as a non-primitive type; the annotation does not inspect the value or guarantee it is a plain object. Arrays, class instances, maps, and sets are also objects, but may call for different checks. See the TypeScript Handbook.
Decide how nullish values should behave
Object.keys() must not be called with null or undefined. Choose whether those inputs should count as empty or not, and encode that policy explicitly. This helper returns false for either:
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
function isEmptyObject(
value: object | null | undefined
): boolean {
return value != null && Object.keys(value).length === 0;
}The value != null check covers both null and undefined. To treat either as empty instead, use value == null || Object.keys(value).length === 0. In either case, callers can see the behavior from the function rather than relying on an unstated assumption.
Know what “empty” means for your object
The standard check is specifically about own, enumerable, string-keyed properties. It ignores inherited properties, own non-enumerable properties, and symbol keys. For example, an object with a non-enumerable property can produce an empty Object.keys() array even though it has an own property. MDN defines the method’s result as “an array of a given object’s own enumerable string-keyed property names.” See MDN: Object.keys().
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Choose the method whose property scope matches the question you need to answer:
| Check | What it counts | Use when |
|---|---|---|
Object.keys(value).length === 0 |
Own, enumerable string keys | Checking the usual object-literal case |
Object.getOwnPropertyNames(value).length === 0 |
All own string-keyed properties, including non-enumerable ones | Non-enumerable string properties should count |
Reflect.ownKeys(value).length === 0 |
All own string and symbol keys | Symbol keys and non-enumerable properties should count |
Object.entries(value).length === 0 |
Own, enumerable string-keyed properties | You need entries as key-value pairs; the scope is the same as Object.keys() |
Object.entries() also requires a non-nullish input. Its behavior and returned entries are described in MDN: Object.entries().
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Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Check Map and Set contents with size
Object.keys() checks an object’s properties, not the entries stored in a collection. For a Map or Set, test its size instead:
const mapIsEmpty = map.size === 0;
const setIsEmpty = set.size === 0;Choose a helper that matches its inputs
For a plain object that cannot be nullish, the one-line Object.keys() check is concise. If a helper accepts a broader object type, callers should know whether arrays or class instances are allowed and what “empty” means for them. If it accepts nullish values, its return policy should be explicit. Use .size for collection contents rather than treating Map or Set as ordinary object literals.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
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