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This API is available on Firefox OS for privileged or certified applications only.

MozNFCTag contains the basic functions needed to read, write, and inspect NDEF-compatible NFC Tags.


Calling makeReadOnly() will make the NDEF stored on this tag read only. Avalable in Firefox OS 2.2+.
Formats this tag as NDEF-compatible. Avalable in Firefox OS 2.2+.
readNDEF() retrieves the NDEF contents stored on this Tag, and returns the NDEF as an array of MozNDEFRecord objects.
writeNDEF() takes an array of MozNDEFRecord objects, and writes them to a NDEF-compatible tag.


 MozNFCTag.techList Read only
The supported NFC Technologies of this tag. Read only
The identifier of this tag.
MozNFCTag.type Read only
The type of this tag,
MozNFCTag.maxNDEFSize Read only
The maximum size of NDEF can be stored on this tag.
MozNFCTag.isReadOnly Read only
Indicate whether the NDEF content stored on this tag read-only or not.
MozNFCTag.isFormatable Read only
Inidicate whether this tag is NDEF-compatible or not.
MozNFCTag.canBeMadeReadOnly Read only
Indicate whether the NDEF stored on this tag could be configured as read-only or not.
MozNFCTag.isLost Read only
Indicate whether if this tag is already lost. (i.e. is moved out of range) 


The NFC implementation in Gecko follows the NFC Forum specifications.

Browser compatibility

Supported in Firefox OS 2.0 for certified-apps.
Available in privileged apps as of Firefox OS 2.2.

See also