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NDEFRecord: mediaType property

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".

Syntax

js

NDEFRecord.mediaType

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 API
# dom-ndefrecord-mediatype

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
mediaType No No No No No No 89 89 No 63 No 15.0

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https://developer.mozilla.org/en-US/docs/Web/API/NDEFRecord/mediaType