Use this parser to convert a string in the named grammar into a structured value while making accepted syntax and failures explicit.

Header

Raw Cache-Control header value.

Tokenize an RFC 9111 Cache-Control header into a record of directives; valueless flags become true and numeric values become numbers. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Directives

Directives keyed by lowercase name; repeated directives keep their last occurrence.

Directive count

Number of distinct directives after tokenizing.

• Parsing rules depend on locale, radix, encoding, escaping, duplicate fields, whitespace, overflow, rounding, time zone, units, and ambiguity policy. Successful parsing does not validate business meaning or make untrusted input safe.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Reject trailing or ambiguous content, preserve the original input, schema-validate the parsed value, and test malformed, boundary, and adversarial cases.

• Numeric Dataset Parser

  Parse and normalize a list of finite numeric values.

• Numeric Matrix Parser

  Parse a rectangular numeric matrix from JSON or comma- and space-separated rows.

• Quantity with Unit Parser

  Parse a finite numeric value and preserve its attached unit without converting it.