Cheat Sheets

JSON Cheat Sheet

Quick reference for JSON — data types, syntax rules, escape sequences, objects, arrays, and JavaScript parse/stringify patterns.

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Structure. Exchange. Parse.

Data Types
StringNumber (integer)Number (decimal)Number (exponent)BooleanNullObjectArray
Object Syntax
Basic objectNested objectEmpty objectMixed types
Array Syntax
Basic arrayMixed arrayArray of objectsObject of arrays2D arrayEmpty array
String Escape Sequences
Double quoteBackslashForward slashNewlineCarriage returnTabBackspaceForm feedUnicode
JavaScript — Parse & Stringify
Parse string → objectStringify object → stringPretty printReplacer filterReviver functionDeep clone
Accessing Data (JavaScript)
Dot notationBracket notationNested objectArray indexArray of objectsOptional chaining
Common Mistakes
Single quotesTrailing commaUnquoted keyHex numberUndefinedComments