Random(ish) is a free API you can use to generate data that is random enough for most use cases that require generic, semi-random data.
The API speaks HTTP & each request has various options that can be used to spice things up a bit. Each request will return a standardized JSON object containing the generated values as well as any errors & warnings.
http://api.randomish.io/number
{
  "warnings":[],
  "errors":[],
  "values": [
        841,
    ]
}

Ready to get started? Here are the docs.