Validator Tool
Client-side validator tool to check common inputs (email, URL, IP, domain, UUID, JSON, Base64, phone, IBAN, credit card). Bulk line-by-line results with clear VALID/INVALID reasons.
- Online Converter — JSON, CSV, Base64, URL, Timestamp, Case | FeuTex
- Online Generator (UUID, Password, Slug, Lorem, Base64) | FeuTex
- SEO Checker Tool Online Free (Client‑Side HTML Audit) | FeuTex
- Percentage Formatter — Format Decimals and Percent Strings
- JSON Tool — Validate, Format, Minify & Sort JSON | FeuTex
- Online JSON Schema Converter (JSON → Schema, Schema → Example/OpenAPI) | FeuTex
- Online Pretty Print Converter Online (JSON, XML, SQL) | FeuTex
- Online Meta Tag Generator (Offline)
How to use
Select what you want to validate, paste your values, then run validation.
- Pick a Validation type (Email, URL, IPv4, JSON, etc.).
- Paste input (for most types: one item per line; for JSON: paste the full JSON).
- Adjust options like Trim whitespace or Ignore empty lines.
- Click Validate to see a summary and per-line results.
FAQ
Does this validator tool send my data to a server?
No. Validation runs in your browser and the tool does not make network requests.
Can I validate multiple values at once?
Yes—paste one item per line (most types) and the output will show a VALID/INVALID line for each.
Why does JSON validation ignore “one per line” behavior?
JSON is validated as one complete value, so the entire textbox is parsed as a single JSON document.
Is the email/URL validation fully RFC compliant?
No. It uses practical checks that catch common mistakes, but it’s not a full RFC parser.
What does “credit card (Luhn)” mean?
It checks the number using the Luhn checksum; it doesn’t confirm the card exists or is usable.
What does the IBAN check validate?
It verifies the general IBAN structure and mod-97 checksum; it may not enforce every country’s exact length rules.
How can I avoid false negatives caused by spaces or blank lines?
Enable Trim whitespace and Ignore empty lines in the Options area.
Continue your workflow
Browse related tools by task. Use the improved core tools for a consistent workspace with file import, downloads and clear validation errors.