Question 247376 in Json Question posted in
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Can I declare an array of integers in JSON without listing each element explicitly?

I want a JSON array to contain all integers between 0 and 1000, but I don’t want to declare each element of that very long array individually. Is there a more economical/elegant way to declare that array in a JSON file?

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2

Answers


  1. 0

    No, all elements in JSON must be listed explicitly. Of course if you are producing this JSON document from some script/program there will surely be terser ways to generate it, but the resulting JSON will list all the elements without shortcuts.

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  2. 0

    No, you can’t. However, JSON is just a convenient way to serialize and de-serialize data and has a mechanism to restore data, called reviver.

    For the task you want, assuming you want the property numbers to be an array of 0 to 1000, I’d do this:

    {
  "foo": "bar",
  "numbers": "0-1000"
}

    And, when you parse it, you can use the reviver function:

    const jsonString = `
{
  "foo": "bar",
  "numbers": "0-1000"  
}
`;

const obj = JSON.parse(jsonString, (key, val) => {
  if (key !== "numbers") return val;
  const res = [];
  const [ low, high ] = val.split("-");
  for (let i = +low; i <= +high; i++) {
    res.push(i);
  }
  return res;
});

console.log(obj);
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