Developer Answers & Reference

Quick, verified answers to common developer questions. Every hash is computed and verified, every regex is tested, every encoding is correct.

Hash Values

Pre-computed hash values for common strings, verified using Node.js crypto module.

MD5 Hashes

MD5 of empty string MD5 of "test" MD5 of "admin" MD5 of "root" MD5 of "example" MD5 of "foo" MD5 of "bar" MD5 of "foobar" MD5 of "123456" MD5 of "qwerty" MD5 of "letmein" MD5 of "abc" MD5 of "abc123" MD5 of "welcome" MD5 of "monkey" MD5 of "The quick brown fox..."

SHA-1 Hashes

SHA-1 of "test" SHA-1 of "admin" SHA-1 of "root" SHA-1 of "example" SHA-1 of "foo" SHA-1 of "bar" SHA-1 of "foobar" SHA-1 of "123456" SHA-1 of "qwerty" SHA-1 of "letmein" SHA-1 of "abc" SHA-1 of "abc123" SHA-1 of "welcome" SHA-1 of "monkey" SHA-1 of "The quick brown fox..."

SHA-256 Hashes

SHA-256 of "hello" SHA-256 of "password" SHA-256 of "test" SHA-256 of "admin" SHA-256 of "root" SHA-256 of "example" SHA-256 of "foo" SHA-256 of "bar" SHA-256 of "foobar" SHA-256 of "123456" SHA-256 of "qwerty" SHA-256 of "letmein" SHA-256 of "abc" SHA-256 of "abc123" SHA-256 of "welcome" SHA-256 of "monkey" SHA-256 of "The quick brown fox..."

SHA-512 Hashes

SHA-512 of "test" SHA-512 of "admin" SHA-512 of "root" SHA-512 of "example" SHA-512 of "foo" SHA-512 of "bar" SHA-512 of "foobar" SHA-512 of "123456" SHA-512 of "qwerty" SHA-512 of "letmein" SHA-512 of "abc" SHA-512 of "abc123" SHA-512 of "welcome" SHA-512 of "monkey" SHA-512 of "The quick brown fox..."

Regex Patterns

Tested regex patterns with breakdowns, test cases, and code examples.

Email validation regex US phone number regex URL validation regex Match digits only regex Remove HTML tags regex UUID v4 validation regex IPv4 address regex IPv6 address regex YYYY-MM-DD date regex Hex color code regex Alphanumeric only regex Strong password regex Credit card number regex US ZIP code regex URL slug validation regex

Encoding Reference

How to encode special characters in URLs and HTML.

URL encode space (%20) URL encode ampersand (%26) URL encode ? (%3F) URL encode # (%23) URL encode @ (%40) HTML encode < (&lt;) HTML encode > (&gt;) HTML encode & (&amp;) Base64 encode "hello world" Base64 decode SGVsbG8gV29ybGQ=

JSON & Data Formats

Validate JSON online Fix JSON trailing comma JSON vs JSONL difference Pretty print JSON (CLI) Minify JSON online

UUIDs & Identifiers

What is a UUID? UUID v4 vs v7 difference

Security & Passwords

Bcrypt rounds recommendation Generate random password

Other

JWT decode online Hex to RGB conversion Unix permissions calculator

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