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VI · Developer & Web
VI · Developer & WebChapter VI
Chapter VI

Developer & Web

Everyday helpers for building for the web.

22 tools · pages 216–261
All run on your device

Chapter VI

In this chapter

  1. W1Regex Tester218

    Test JavaScript regular expressions with highlighted matches, capture groups, replace preview and a plain-English explanation.

  2. W2Cron Explainer220

    Turn a cron expression into plain English and list its next run times in any time zone.

  3. W3Unix Timestamp Converter222

    Convert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds to dates and back.

  4. W4Time Zone Converter224

    Show one time across several time zones and find overlapping working hours for a meeting.

  5. W5Number Base Converter226

    Convert numbers between binary, octal, decimal, hex and any base from 2 to 36, with two's complement and a bit view.

  6. W6Colour Converter & Contrast228

    Convert colours between HEX, RGB, HSL, HWB, LAB, LCH and OKLCH, and check WCAG and APCA contrast.

  7. W7QR Code Generator & Reader230

    Make QR codes for text, links, Wi-Fi, contacts and email, or read one from an image or your camera.

  8. W8Barcode Generator232

    Create CODE128, EAN, UPC, CODE39, ITF and MSI barcodes with check-digit validation.

  9. W9cURL Converter234

    Convert a curl command into fetch, axios, Python requests, Go net/http or PHP code.

  10. W10Subnet Calculator236

    Work out IPv4 and IPv6 network ranges, masks and host counts from CIDR notation, and split subnets.

  11. W11Chmod Calculator238

    Convert Unix file permissions between octal and symbolic notation, including setuid, setgid and sticky bits.

  12. W12Docker Run ⇄ Compose240

    Convert docker run commands into compose.yaml, and a single compose service back into docker run.

  13. W13User-Agent Parser242

    Parse a user-agent string into browser, engine, OS, device and CPU details.

  14. W14HTTP Status, MIME & Ports244

    Searchable reference of HTTP status codes, common MIME types and well-known ports.

  15. W15Case Converter246

    Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case and more.

  16. W16Slugify248

    Turn titles into clean URL slugs, transliterating accented letters, with your choice of separator and length.

  17. W17Word Counter250

    Count words, characters, lines, sentences and paragraphs, estimate reading time and see character frequency.

  18. W18Line Tools252

    Sort, dedupe, trim, shuffle, number and prefix lines of text.

  19. W19Lorem Ipsum Generator254

    Generate placeholder paragraphs, sentences or words of lorem ipsum text.

  20. W20CSS Gradient & Shadow256

    Build CSS gradients and box shadows with a live preview and copy the CSS.

  21. W21Meta Tag Generator258

    Write HTML meta, Open Graph and Twitter card tags and preview how links will look when shared.

  22. W22Semver Calculator260

    Compare and sort semantic versions, test them against ranges and work out the next version.