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JavaScript Tutorial

Variables to closures, promises, the DOM and OOP — a complete JS reference.

JSON.stringify()

Converts a JavaScript value into a JSON-formatted string — the standard way to serialize data for storage or a network request.

JSON.stringify({ name: 'Ada', age: 30 });
// '{"name":"Ada","age":30}'

JSON.stringify({ a: 1, b: undefined, c: function(){} });
// '{"a":1}'  — undefined & functions are dropped

JSON.stringify({ a: 1 }, null, 2); // pretty-printed with 2-space indent
  • undefined, functions and Symbols are silently omitted from objects
  • The 3rd argument controls pretty-printing indentation
  • The 2nd argument (replacer) can filter or transform values