Working with JSON
JavaScript Object Notation (JSON) is the universal format for exchanging structured data across the web.
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📋 Copy Safe JSON Parser & Date Reviver Snippet
// Safe JSON Parsing with Custom Reviver
function safeJsonParse(text, fallback = {}) {
try {
return JSON.parse(text, (key, value) => {
// Automatically deserialize ISO date strings
if (typeof value === "string" && /^\d{4}-\d{2}-\d{2}T/.test(value)) {
return new Date(value);
}
return value;
});
} catch {
return fallback;
}
}⚠️ 5 Fatal Traps & JavaScript Pitfalls
Trap #1: JSON.parse() Throws Fatal SyntaxError on Bad Input
Passing invalid JSON, an empty string, or an HTML error page to
JSON.parse() immediately crashes the executing script with a SyntaxError. Always wrap in a try...catch.Trap #2: Silent Stripping of undefined, Functions, and Symbols
JSON.stringify() silently omits object properties with values of undefined, functions, or Symbols, causing silent data loss.Trap #3: Circular Reference TypeError
Attempting to serialize an object that references itself throws
TypeError: Converting circular structure to JSON.Trap #4: NaN and Infinity Serialized as null
JSON does not support
NaN, Infinity, or -Infinity; serializing them converts them silently to null.Trap #5: Integer Key Coercion to Strings
In JSON, all dictionary keys must be strings. Parsing JSON converts numeric keys to string properties.
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