چیت‌شیت JSON

1{2  "quote": "She said: \"Hello\"",3  "path": "C:\\app\\data",4  "lineBreak": "first\nsecond",5  "tab": "column1\tcolumn2",6  "symbol": "\u2605"7}

1{2  "whole": 42,3  "negative": -7,4  "decimal": 10.25,5  "scientific": 1.2e3,6  "zero": 07}

1// کامنت مجاز نیست2{ name: 'Nina', }

1{2  "user": {3    "id": "u-42",4    "profile": {5      "displayName": "Nina",6      "locale": "fa"7    }8  }9}

1{2  "products": [3    { "sku": "A-1", "price": 12.5 },4    { "sku": "B-2", "price": 8.0 }5  ]6}

1{2  "middleName": null3}

1function parseJson(text) {2  try {3    return JSON.parse(text);4  } catch (error) {5    console.error("Invalid JSON", error);6    return null;7  }8}

1const payload = { name: "Nina", active: true };2const compact = JSON.stringify(payload);3const formatted = JSON.stringify(payload, null, 2);

1const user = {2  name: "Nina",3  profile: { city: "Tehran" },4  tags: ["admin", "editor"]5};67user.name;8user["profile"].city;9user.tags[0];

1const city = user.profile?.city ?? "نامشخص";2const firstTag = user.tags?.[0];

1function isUser(value) {2  return value !== null &&3    typeof value === "object" &&4    typeof value.id === "string" &&5    typeof value.name === "string";6}

1const response = await fetch("/api/users");2if (!response.ok) {3  throw new Error(`HTTP ${response.status}`);4}5const users = await response.json();

1مجاز: string، number، boolean، null، object، array2نامجاز به‌عنوان نوع JSON: undefined، function، Symbol