A QR Code Primer

• ZXing

  42 32,250 8.6 Java

  ZXing ("Zebra Crossing") barcode scanning library for Java, Android

  

Once the contents are decoded, the scanner now figures out what it's looking at based on its format. The format, or "data type" of the contents is not bound to the QR Code standards. We're now out of QR Code territory. This step is equivalent to typing out a piece of text and asking the computer what it's looking at. Is it a URL? A date? An email address? Or something else? There are quite a few standards that define these data types. A very popular list of data types is defined in the open-source ZXing library. Stated in its README is:

• RandomDocs

  1 4 2.6 Python

  Random Documentation & Learning

If you scan a UPI QR Code near you using a generic QR scanner, you'll find that the decoded content is a deep link that contains the information necessary to make a UPI payment. Unfortunately I couldn't find any official documentation on the structure of this deep link. The closest I could get to some structured documentation was this wiki on GitHub which seems like the results of someone else's research on this same topic. In its most basic form, the UPI deep link looks something like this:

• InfluxDB

  www.influxdata.com featured

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

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