Dev Helpers
Handy utilities for developers: regex tester, slug generator, Lorem Ipsum generator, random string and number generators.
Interactive guide and template generator for writing accessible image alt text.
Convert rate limits between time windows and estimate monthly API costs.
Searchable reference for all WAI-ARIA roles with descriptions, required properties, and allowed states.
Generate random CSV data with custom columns and types.
Build cURL commands visually with URL, method, headers, body, and auth.
Score your email subject line against deliverability and engagement best practices.
Validate email addresses against RFC 5322 rules with local part, domain, and TLD breakdown.
Generate rows of realistic fake data with configurable columns.
Check font sizes against WCAG accessibility guidelines for body, headings, and mobile.
Move CSS from <style> blocks to inline style attributes for HTML emails.
Parse raw HTTP headers into a structured key-value table.
Searchable reference of all HTTP status codes with descriptions.
Define a schema and generate an array of JSON objects.
Browse mock API endpoint patterns and copy sample JSON responses for /users, /posts, /todos, and more.
Generate Lorem Ipsum placeholder text for mockups and prototypes.
Convert Markdown to Discord-flavored markdown with Discord-specific formatting.
Convert standard Markdown to Slack mrkdwn format.
Searchable reference of common MIME types grouped by category.
Parse OAuth callback URLs and decode JWT access tokens in one place.
Format phone numbers in E.164, national, and international formats for 10 countries.
Generate placeholder text in multiple styles beyond Lorem Ipsum.
Generate a template-based privacy policy for your website.
Generate random email addresses for testing and sample data.
Generate random full names with gender and count options.
Generate random numbers within a configurable range.
Generate random strings with configurable length and character set.
Test regular expressions against text with real-time match highlighting.
Check if a regular expression pattern is valid and inspect its structure.
Validate semantic version strings and parse major, minor, patch, pre-release, and build metadata.
Convert text to a URL-friendly slug instantly.
Generate a template-based Terms of Service for your website.
Format webhook payloads and detect the provider from Stripe, GitHub, and Slack signatures.
Generate a unique URL to capture and inspect incoming HTTP requests in real time.
FAQ
- How does the regex tester work?
- Enter a regex pattern and flags, then type or paste test text. The tool highlights all matches in real time and shows capture groups for each match.
- What is a slug?
- A slug is a URL-friendly version of a string, typically lowercase with hyphens replacing spaces and special characters removed. Used in URLs, filenames, and identifiers.