What does the JSON Schema Validator check?

It validates JSON data against a JSON Schema definition, checking data types, required fields, value ranges, and custom validation rules.

How accurate is the email validator?

The validator checks against RFC 5322 email syntax rules. It catches obvious errors but cannot verify if an email address actually exists (that requires server-side verification).

Can I test regex patterns with the Regex Tester?

Yes. Enter your pattern and test string, and the tool highlights matches in real time. It also shows capture groups and provides common pattern examples.

What IP formats does the subnet calculator support?

The calculator supports both IPv4 and IPv6 addresses, CIDR notation, and subnet mask formats. It computes network address, broadcast, host range, and total hosts.

Is the password generator truly random?

Yes. It uses the browser's crypto.getRandomValues() API for cryptographically secure random generation, equivalent to /dev/urandom on Unix systems.

Validators & Network

Regex tester, JSON schema, HTTP status, IP subnet, email, credit card validators.

19 tools

Regex Tester

Test JavaScript regex with live match highlighting & groups.

json formatterurl encode decodebase64 encode decode

Cron Expression Parser

Explain a 5-field cron expression and compute its next 5 runs.

json formatteruuid generatorhash generator

HTTP Status Codes Reference

Searchable reference of 60+ HTTP status codes — click to copy.

json formatterurl encode decodejwt decoder

New

JSON Schema Generator

Infer a draft-07 JSON Schema from a sample JSON object.

json to typescriptjson formatterjson to csv

New

HTTP Headers Decoder

Parse and annotate raw HTTP headers — 60+ known headers.

http statusjwt decoderurl encode decode

New

IP Subnet Calculator

Compute network, broadcast, mask and host range for IPv4 / IPv6.

http statusurl encode decodeuuid generator

New

Email Validator

RFC 5322 format check — no DNS lookup, fully client-side.

credit card validatorisbn validatoriban validator

New

Credit Card Validator

Luhn checksum + card type detection — 100% private.

email validatorisbn validatoriban validator

New

ISBN Validator

Validate ISBN-10 and ISBN-13 checksums — mod 11 / mod 10.

email validatorcredit card validatoriban validator

New

IBAN Validator

Mod-97 checksum for International Bank Account Numbers.

email validatorcredit card validatorisbn validator

New

chmod Calculator

Convert between octal (755) and symbolic (rwxr-xr-x) permissions.

ip subnet calculatornumber base convertercron parser

New

curl Command Builder

Build a curl command from a friendly UI — shell-safe quoting.

http statushttp headers decoderjwt decoder

New

nginx Config Generator

Generate nginx server blocks — static, SPA, proxy, PHP-FPM, HTTPS.

htaccess generatordockerfile generatorgitignore generator

New

Keyboard Shortcut Reference

Searchable reference of 70+ shortcuts across Windows, macOS, browser, VS Code.

http statusregex testercron parser

New

HTML Heading Validator

Check h1–h6 structure for SEO — skips, multiple h1s, empty headings.

html entitieshtml to markdownxml formatter

New

Truth Table Generator

Generate a truth table for any boolean expression.

regex testerjsonpath testercron parser

New

My IP Address

See your public IPv4, IPv6 and WebRTC-discovered IP.

http statusip subnet calculatorurl encode decode

New

Viewport Inspector

Live viewport size, DPR, orientation and Tailwind breakpoints.

my ip addresshttp statusregex tester

New

JSONPath Tester

Evaluate JSONPath expressions against JSON — pure JS.

json formatterjson schema generatorjson to typescript

Validation and Network Tools

Validators check data against defined rules and standards. They help catch errors early, from malformed JSON and invalid email addresses to weak passwords and incorrect credit card numbers.

Our validation tools run entirely in your browser, making them safe for testing sensitive data like API keys, passwords, and personal information. Nothing is transmitted to external services.

Network tools provide quick reference and testing capabilities for HTTP status codes, IP subnet calculations, and cron expressions. They are essential for backend developers and DevOps engineers.