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You can read and write NFC tags from a web page with the Web NFC API, but only when the browser, device, and tag support it. Web NFC works with NDEF-formatted messages; it is not a general interface for every NFC card or low-level NFC protocol.
Check whether Web NFC fits your setup
Before building a workflow, confirm that the page will run in a secure context, the browser and device support Web NFC, and the tag can use NDEF. MDN describes the API as having limited availability, so check its current browser compatibility table rather than assuming support across mobile or desktop browsers. The API requires HTTPS in supporting browsers.
- Page: Serve it over HTTPS.
- Browser and device: Use a browser with Web NFC support on a device with NFC hardware.
- Tag: Use an NDEF-compatible tag, such as a tag or sticker formatted for NDEF messages.
Web NFC is suitable for exchanging NDEF records. It is not the right approach for proprietary NFC technologies or tasks that need low-level NFC I/O.
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Read an NFC tag
Feature-detect NDEFReader before showing a scan control. Call scan() in response to the user’s action, listen for reading to receive the message, and handle scan setup errors separately from a tag-reading error.
#1 Best Overall
- It not only supports Mifare cards and Class A and B cards conforming to the ISO 14443 standard, but also supports NFC and FeliCa contactless technology.
- This is a USB hot-pluggable device that complies with the CCID standard and is ideal for applications such as personal identity security authentication and online micropayments.
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- To increase the safety factor, you can choose to configure an ISO7816-3 compliant SAM card slot in the ACR122.
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async function scanNfc() {
if (!("NDEFReader" in window)) {
console.error("Web NFC is not available in this browser.");
return;
}
const reader = new NDEFReader();
reader.addEventListener("reading", ({ message, serialNumber }) => {
console.log("Serial number:", serialNumber);
for (const record of message.records) {
console.log(record.recordType, record.data);
}
});
reader.addEventListener("readingerror", () => {
console.error("A tag was detected but could not be read.");
});
try {
await reader.scan();
} catch (error) {
console.error("Could not start NFC scanning:", error);
}
}The scan() promise can reject, for example, if permission is denied or the necessary hardware is unavailable. A readingerror event is different: it indicates that a nearby tag was detected but could not be read. The browser may ask the user to grant NFC permission. See MDN’s scan() method documentation for the operation and its failure cases.
Decode and validate record data
The message.records collection contains NDEF records, not automatically trusted application data. For a text record, decode its bytes using the record’s encoding and format, then validate the resulting value before using it in application logic. The W3C Web NFC Community Group explainer shows decoding with TextDecoder and DataView; the appropriate decoding depends on the record format.
Rank #2
- acr122u nfc reader writer
- 13.56 Mhh support mifare 1k, ntag213, ultralight /ultralightc, Mifare plus, Mifare desfire
- provide SDK and free nfc tool software
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- IEC14443A and ISO18092 protocol compliance
Write an NDEF message
Create an NDEFReader and pass an NDEF message to write(). This example writes a URL record:
async function writeNfcUrl() {
if (!("NDEFReader" in window)) {
console.error("Web NFC is not available in this browser.");
return;
}
const writer = new NDEFReader();
try {
await writer.write({
records: [{ recordType: "url", data: "https://example.com/" }],
});
console.log("NDEF message written.");
} catch (error) {
console.error("NFC write failed:", error);
}
}Tell users what the page will write before they present a tag. A successful write is not guaranteed: permission, adapter, or transfer problems can cause the promise to reject. MDN documents the write() method, including accepted message forms and write failures.
Rank #3
- 【2-in-1 CAC & NFC Smart Card Reader】2-in-1 contact and contactless card reader equipped with integrated USB-A & USB-C dual-head cable. Supports CAC, PIV, military ID, chip credit/debit cards and NFC ID badges. Only one reading mode can be activated at a time to guarantee stable data reading. No extra adapter required for different device ports.
- 【Full Certification & Broad Card Support】 Certified FCC, CE, VCCI, CCID and Microsoft WHQL. Contact interface follows ISO7816 Class A/B/C with T0/T1 protocol; NFC module supports ISO14443 A/B and MIFARE. Compatible with SLE, AT88SC memory smart cards, meeting PC/SC 2.0 and EMV standards for high-security military and government authentication.
- 【Plug & Play Multi-OS Reader】No driver needed for immediate use. Works on Windows, mac OS, Linux and Android devices. Standard CCID hardware compatible with common card management tools. Please be aware that third-party decoding software and official card middleware are not included in the package.
- 【Durable & Travel-Friendly Construction】Comes with 95cm reinforced strain-relief cable, LED light and buzzer prompt. Compact lightweight body supports USB 2.0 480Mbps high-speed transmission. Perfect for daily office, business trips and field identity verification for military and government users.
- 【Application & Reliable After-Sales Service】Great for tax declaration, pension inquiry, vehicle registration and access control. ❗Not compatible with health insurance cards. Package: 1×Smart Card Reader, 1×User Manual. 24-month warranty and lifetime technical support; free return for quality defects.
When the user must choose a tag first
If the page needs to discover a tag before writing to it, coordinate a read event with the write operation. MDN’s NDEFReader documentation describes this pattern. An AbortController can cancel scans or writes when a user leaves the relevant view or a timeout is reached.
Account for page visibility and operation lifecycle
The W3C Web NFC Community Group explainer limits Web NFC to a visible, top-level browsing context. Operations are suspended while the document is hidden and resume as appropriate when it becomes visible. In a single-page app, decide what should happen to an active scan when the user navigates away or backgrounds the page; cancellation can prevent an operation from outliving the screen that started it.
Rank #4
- The card and keychain sent are CUID cards,with serial port which can be directly plugged into USB and then drive CH340E
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Do not treat tag contents as trustworthy
The W3C Web NFC Community Group explainer states: “NFC (with NDEF) is not secure for authenticity or integrity.” A tag can be read by others and, unless it is read-only, written by others. Web NFC does not automatically encrypt records or attach signatures. A URL on a tag is therefore not trustworthy simply because it arrived over NFC.
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Best Value
- 2-in-1 NFC & CAC Reader: This credit card reader Combines contact CAC card slot and contactless NFC sensing area in one compact unit; reads inserted military CAC/PIV government smart cards and tap-to-scan NFC IDs, access badges, debit & credit chip cards; only operate one card mode at a time for stable data reading.
- Full Standard Protocol Compliance: This nfc reader writer Passes FCC CE VCCI CCID Microsoft WHQL certification; contact slot supports ISO7816 Class A/B (5V/3.3V), T=0/T=1 transmission; NFC area works with ISO14443 A/B, MIFARE series and T=CL protocol cards, built for high-security identity authentication scenarios.
- Plug-And-Play: No extra driver installation required for most mainstream operating systems; This smart card reader fully functional on Windows XP and newer, macOS 11.1+, Linux Fedora FC8+, Android USB-A devices; recognized as standard CCID hardware by OpenSC, NFCtools and common card management tools.
- Wide Applications: This cac reader military is ideal for military staff, government contractors, IT security specialists and daily users; fits tax filing, pension inquiry, vehicle registration, criminal record verification, office access control and secure digital login; note: matching third-party card decoding software is not included, incompatible with medical health insurance cards.
- Portable Durable Build: This cac reader for iphone is Equipped with reinforced integrated USB-A/C cable and rugged anti-slip plastic housing; built-in LED light and buzzer give clear audio-visual prompt once card signal is captured; lightweight compact body easy to carry for office, field work and travel use, USB 2.0 480Mbps fast data transfer.
- Validate and constrain record values before using them in an application.
- For data that needs authenticity or integrity, use an appropriate verification design rather than trusting the tag alone.
- Do not treat a tag’s serial number or its physical presence as proof that its contents are genuine.
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