NDEFRecord: mediaType property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The mediaType property of the NDEFRecord interface returns the MIME type of the record. This value will be null if recordType is not equal to "mime".

Value

A string, containing the MIME type of the record payload.

Examples

The following example loops over the records in an NDEFMessage object, which is retrieved from NDEFReadingEvent.message. It then uses the mediaType property to determine which of the records to parse.

js
const ndef = new NDEFReader();
await ndef.scan();
ndef.onreading = (event) => {
  const decoder = new TextDecoder();
  for (const record of event.message.records) {
    if (record.mediaType === "application/json") {
      const json = JSON.parse(decoder.decode(record.data));
      const article = /^[aeio]/i.test(json.title) ? "an" : "a";
      console.log(`${json.name} is ${article} ${json.title}`);
    }
  }
};

Specifications

Specification
Web NFC
# dom-ndefrecord-mediatype

Browser compatibility