How to use d3.min and d3.max within a d3.json command

If your data is an array, your original code will work, if you get rid of the brackets around data:

  var data = [32710,20280,18002];

  console.log(data);
  console.log(d3.min(data));
  console.log(d3.max(data));

If you need to identify the array values with the keys “01”,”02″, “03”, create an array of objects, and operate on the values to get min/max:

   //data as key/value pairs
   var data = [
     {key: "01",  value:  32710},
     {key: "02",  value:  20280},
     {key: "03",  value: 18002}
  ];

  console.log(data);
  console.log(d3.min(data, function(d) { return d.value; }));
  console.log(d3.max(data, function(d) { return d.value; }));

  // AND IF YOU WANT THE min/max of the KEYS:
  console.log(d3.min(data, function(d) { return d.key; }));
  console.log(d3.max(data, function(d) { return d.key; }));