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Some npm dependencies work on Cloudflare Workers, but installing a package—or successfully importing it—is not proof that it will run correctly. Compatibility depends on the exact package version and Node.js APIs it uses, the Worker’s compatibility date and flags, and whether Cloudflare’s implementation behaves as the package expects. Check those details and test in a Workers environment before deploying.
Will my npm package work on Cloudflare Workers?
There is no blanket guarantee for npm packages. Cloudflare Workers provides native implementations for a documented subset of Node.js APIs, alongside partial implementations and Wrangler-added polyfill shims. Some modules are stubs: an import may resolve even though the API does no useful work or a method the package calls is unavailable. Cloudflare’s Node.js compatibility documentation distinguishes these support levels.
Assess the APIs a dependency actually imports and calls, not just its name or whether it installs. Include indirect dependencies and runtime paths used by the features your application enables. A package may work for one feature and fail when another path invokes an unsupported or differently behaving API.
How do I check whether a dependency is compatible?
- Identify the exact dependency versions. Review direct and, where practical, transitive dependencies. Look for Node.js built-ins they import or rely on, and identify the methods and features they use at runtime.
- Compare those APIs with Cloudflare’s support list. Check whether each relevant API is native, partial, or listed among shimmed or stub modules. Treat partial support and stubs as specific risks to test; a successful import alone does not establish that the needed calls work.
- Inspect the Worker’s compatibility settings. Check
compatibility_dateandcompatibility_flagsin the Wrangler configuration. The date and flags determine which Node.js compatibility behavior is enabled. - Run tests and representative code in the Workers environment. A test under ordinary Node.js cannot establish that the Worker’s API surface and behavior match. Exercise the dependency’s real runtime paths, especially features that rely on partial APIs or test utilities.
- Review and test any compatibility-date change before deployment. Cloudflare says the new date takes effect on the next
npx wrangler deploy; older dates remain supported. See its compatibility dates guidance.
Do I need nodejs_compat?
It depends on the Worker’s compatibility date. Cloudflare’s changelog says that dates of 2026-08-04 or later enable both nodejs_compat and nodejs_compat_v2 by default. For dates from 2024-09-23 through 2026-08-03, add nodejs_compat to opt in. Older configurations have different flag history, so check Cloudflare’s current compatibility flags documentation rather than assuming the same rule applies.
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#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.
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- 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.
If you need to turn Node.js compatibility off on a date of 2026-08-04 or later, Cloudflare’s documented configuration requires removing the positive flags and adding both no_nodejs_compat and no_nodejs_compat_v2. Verify the current flags documentation when changing this setting.
Why test in Workers instead of relying on Node.js tests?
Workers does not promise identical support for every Node.js API or behavior. Cloudflare’s Node.js test documentation, last updated 2026-06-05, gives a concrete example: its Workers implementation of MockTracker does not include mock timers. A test suite that passes under Node.js can therefore depend on test functionality that is absent in Workers. See Cloudflare’s Node.js test documentation.
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- 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.)
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- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Use the current Cloudflare toolchain to run representative local Worker execution alongside your project tests. Where your dependency depends on partial APIs, add targeted checks for the exact methods and behavior your application needs.
Should I update the compatibility date?
Cloudflare recommends setting a new project’s compatibility_date to the current date. A newer date can enable newer runtime behavior, but it is a configuration change to review and test—not a promise that every dependency will work. Cloudflare says the change takes effect on the next npx wrangler deploy, and old dates continue to be supported. Read the compatibility-date guidance and review the flags history before changing an existing project.
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- 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.
For an npm package error, Cloudflare recommends trying an updated compatibility date together with the latest Wrangler CLI or Cloudflare Vite Plugin. That may address a compatibility issue, but it cannot add support for every API or guarantee a package will work. If the package still fails, Cloudflare’s Node.js compatibility documentation suggests reporting the problem as an issue.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What a compatibility check can—and cannot—tell you
A successful check is specific to the dependency versions, features exercised, and Worker configuration you tested. Package updates can alter which APIs are used, and Cloudflare’s runtime documentation and compatibility behavior can change. Recheck when those inputs change. Without examining a particular dependency tree and configuration, no general answer can guarantee that an individual application will run.
Quick Recap
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- 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.
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- 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
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.
