Online Validator

Validate URLs, emails, phone numbers, JSON, and CSV files with instant feedback and error details.

Request Feature / Support

6,012+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

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Om dette verktøyet

The Online Validator is a comprehensive tool that allows you to validate multiple data types in one place. It checks URLs for proper format and accessibility, validates email addresses against RFC standards, verifies phone number formats (international and US), validates JSON syntax, and checks CSV files for structural errors. All validations are performed client-side for instant results without server delays.

Save your calculation history with a free account

Hvordan bruke

Select the validation type from the tabs.
For URL, email, or phone: Enter the value in the input field.
For JSON: Paste your JSON data into the textarea.
For CSV: Click the upload area or drag & drop a CSV file.
Click the 'Validate' button to check.
View detailed results with success/error messages.

Frequently Asked Questions

Finn raske svar

What validation standards does this tool use?

URLs are validated for format and tested with a HEAD request. Emails follow RFC 5322 standards. Phone numbers accept international formats (E.164) and US patterns. JSON uses strict syntax parsing. CSV checks for consistent column counts and proper delimiters.

Are my files uploaded to a server?

No, all validation happens entirely in your browser. CSV files are read locally using JavaScript, and no data is sent to any server.

Can I validate multiple items at once?

Currently, you can validate one item at a time per validation type. For batch validation of multiple emails or URLs, consider using our batch processing tools.

Need to run multiple calculations?

Create a free account today to unlock unlimited daily runs, access advanced parameters, save your history, and request custom features.

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