RegExr
Learn, build and test regular expressions with live matching
12 tools like Crontab Guru, chosen by what they do. About Crontab Guru

Learn, build and test regular expressions with live matching

Convert Unix timestamps to dates and back, with code examples

Preview how links look on social media and generate OG images

Generate random version 4 UUIDs online, one at a time or in bulk

Free fake REST API with placeholder JSON data for testing

Offline desktop toolkit with 30 tools for everyday developer tasks

Decode, verify and generate JSON Web Tokens in your browser

Hand-picked collection of Open Graph images for inspiration

Generates typed models from JSON, JSON Schema and GraphQL

Free collection of online tools for developers and IT work

Converts code between formats such as JSON, YAML, SVG and TypeScript

Visualize JSON, YAML, CSV and XML as interactive graphs