JSON Data Types Explained: The Six Value Types of RFC 8259
The six JSON value types per RFC 8259 — object, array, string, number, boolean, and null — with valid vs invalid examples and the type mistakes that break APIs.
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All articles about rfc-8259: 4 practical guides and tutorials from our free, privacy-first online tools.
JSON Number Format Rules: Grammar, One Number Type, and Precision (RFC 8259)
How numbers work in JSON per RFC 8259: the exact grammar, one number type with no int/float split, no NaN or Infinity, and IEEE 754 precision pitfalls beyond 2^53.
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JSON String Escaping Rules: The Complete Guide (RFC 8259)
The complete RFC 8259 rules for JSON strings: which characters must be escaped, the backslash escapes, \uXXXX unicode escapes, surrogate pairs, and common mistakes.
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JSON Object Syntax: Names, Quoted Strings, and Double Quotes (RFC 8259)
How JSON objects must be written per RFC 8259: names are quoted strings, strings use double quotes, the six structural characters, trailing commas, and worked examples.
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