Toolfy▾
ToolfyValidate email address format according to RFC 5321 rules. Checks for valid local part, domain structure, TLD format, and common mistakes. Batch validate multiple email addresses at once.
Email Validator runs in your browser, which keeps everyday developer workflows fast and avoids unnecessary uploads for normal use. Validate email address format according to RFC 5321 rules. Checks for valid local part, domain structure, TLD format, and common mistakes. Batch validate multiple email addresses at once.
The tool runs in your browser and is designed for local processing instead of sending pasted content to an application server.
Yes. Toolfy tools are free online utilities for everyday developer workflows.
Build, test, and debug regular expressions interactively. Highlights all matches inline with clickable detail panels showing capture groups, named groups, and position. Auto-explains every token in your pattern (anchors, quantifiers, lookaheads, character classes, and more). Supports replace with group references ($1, $<name>) and extract with custom format templates. Includes a test-case suite to verify full-match, any-match, or no-match expectations. Supports all JavaScript regex flags: g, i, m, s, u.
JSON ValidatorValidate JSON syntax instantly with detailed error messages showing exactly where parsing fails. For valid JSON, displays structural statistics including object count, array count, key count, nesting depth, and value type breakdown.
URL ValidatorValidate and parse URLs into their components — protocol, hostname, port, pathname, query parameters, and fragment. Check for malformed URLs, missing required parts, and unsupported schemes.