Parsing and serializing JSON
JSON is a widely used data interchange format. It is a human-readable, but also easily machine-readable.
To parse a JSON string, you can use the builtin JSON.parse function. The value is returned as a JavaScript object.
const text = `{ "hello": "world", "numbers": [1, 2, 3] }`; const data = JSON.parse(text); console.log(data.hello); console.log(data.numbers.length);To turn a JavaScript object into a JSON string, you can use the builtin JSON.stringify function.
const obj = { hello: "world", numbers: [1, 2, 3], }; const json = JSON.stringify(obj); console.log(json); // {"hello":"world","numbers":[1,2,3]}By default JSON.stringify will output a minified JSON string. You can customize this by specifying an indentation number in the third argument.
const json2 = JSON.stringify(obj, null, 2); console.log(json2); // { // "hello": "world", // "numbers": [ // 1, // 2, // 3 // ] // }Run this example locally using the Deno CLI:
deno run https://docs.deno.com/examples/scripts/parsing_serializing_json.ts