Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesKeep data returned by fetch() typed as unknown until runtime checks confirm its shape. An interface tells TypeScript what your code expects; it does not verify that a server actually sent those fields. Check the HTTP status, parse the response, validate the resulting value, and only then use it as a narrower application type.
Why a TypeScript type does not validate a fetch response
A TypeScript interface or type describes data your program expects at compile time. It does not inspect a JSON payload arriving over the network. For example, await response.json() as User is an assertion: it tells the compiler to treat the value as a User, but performs no runtime check and does not change the value.
Response.json() reads the response body to completion and parses it as JSON. If parsing succeeds, the body was valid JSON; that alone does not prove it contains a string id, a string name, or any other fields your application needs. Malformed JSON can also make parsing fail.
Use unknown as the network trust boundary
Assign parsed response data to unknown before using it as a specific type. Unlike any, unknown prevents unchecked property access: code must narrow the value with runtime checks or use an assertion before treating it as a particular shape. This makes the validation step visible in the type flow.
Free tools Windows power users keep installed
One-click scans. No signup required.
#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.
For an endpoint expected to return { id: string; name: string }, define the application type and a type guard that checks the values at runtime:
interface User {
id: string;
name: string;
}
function isUser(value: unknown): value is User {
return (
typeof value === "object" &&
value !== null &&
"id" in value &&
typeof value.id === "string" &&
"name" in value &&
typeof value.name === "string"
);
}The checks establish that the value is a non-null object, contains both required keys, and has string values for those properties. The value is User return type tells TypeScript that a successful check narrows the value to User.
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.
Check HTTP status, then parse and validate
HTTP success and response shape are separate checks. Response.ok is true for status codes from 200 through 299; a successful status does not guarantee a valid JSON body or the expected fields.
Use the following flow when a function should return a validated User:
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →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.
async function getUser(url: string): Promise<User> {
const response = await fetch(url);
if (!response.ok) {
throw new Error(`HTTP error: ${response.status}`);
}
const body: unknown = await response.json();
if (!isUser(body)) {
throw new Error("Unexpected response shape");
}
return body;
}The function rejects non-2xx responses, lets JSON parsing errors surface, and rejects parsed values that do not satisfy the guard. Only after validation does it return the body as User. Adapt the guard and error handling to the endpoint’s actual contract; this example covers only the two required string fields.
Validate the complete shape your code relies on
A type guard is useful only if its checks match the assumptions made by the rest of the application. If the type includes nested objects, arrays, optional properties, or additional required fields, check those shapes too. Checking only that the top-level value is an object does not establish that its contents are safe to use.
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
TypeScript control-flow analysis can narrow a value as runtime checks succeed. Keep the data as unknown until those checks have established every property your code relies on; do not substitute a type assertion for missing validation.
What strict compiler settings can and cannot do
Strict TypeScript checking, including strictNullChecks and noImplicitAny, helps catch static typing gaps in your code. It cannot inspect a response from a server at runtime or guarantee that remote data matches an interface. Compiler settings complement runtime validation; they do not replace it.
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.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
