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

Query string

Query string without the leading question mark.

Parse a URL query string into an object of decoded keys and string values (repeated keys keep the last value). 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]

Params

Decoded parameter object.

• 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.

• URL Parser

  Split an absolute hierarchical URL into protocol, host, port, path, query, and fragment components. Bracketed IPv6 hosts and user-info prefixes are supported.

• Cache-Control Header Parser

  Tokenize an RFC 9111 Cache-Control header into a record of directives; valueless flags become true and numeric values become numbers.

• POSIX File Mode Parser

  Parse a three- or four-digit octal POSIX file mode into permission bits and an rwx string. The leading digit holds setuid, setgid and sticky bits.