Developer
Regex, cron, CSS, formatters and lookups for the day-to-day tools developers reach for.
- Live
Regex tester
Test JavaScript regular expressions against any text — see matches, capture groups, and replacements live, in your browser.
DeveloperFreeRuns locallyOpen - Live
Diff viewer
Compare two pieces of text side by side — line, word, or character diff — privately in your browser.
DeveloperFreeRuns locallyOpen - Live
Lorem ipsum generator
Generate placeholder text — paragraphs, sentences, or words — instantly, with optional HTML tags.
DeveloperFreeRuns locallyOpen - Live
Slugify
Turn any title into a clean, URL-safe slug — Unicode aware, with separator and stop-word options.
DeveloperFreeRuns locallyOpen - Live
Cron expression builder
Build, validate and explain cron expressions — see the next 5 runs and a plain-English description.
DeveloperFreeRuns locallyOpen - Live
Cubic-bezier editor
Visually design CSS cubic-bezier easing curves — drag the handles, preview the motion, and copy the CSS.
DeveloperFreeRuns locallyOpen - Live
CSS box-shadow generator
Design CSS box-shadow values with live preview — offsets, blur, spread, opacity, and inset.
DeveloperFreeRuns locallyOpen - Live
CSS border-radius generator
Visually design CSS border-radius — uniform, per-corner, and elliptical — with live preview.
DeveloperFreeRuns locallyOpen - Live
CSS gradient generator
Build linear, radial, and conic CSS gradients — drag stops, pick colors, copy the CSS.
DeveloperFreeRuns locallyOpen - Live
SQL formatter
Pretty-print SQL queries — PostgreSQL, MySQL, SQLite, BigQuery and standard SQL — privately in your browser.
DeveloperFreeRuns locallyOpen - Live
YAML formatter
Format and validate YAML, or convert between YAML and JSON — privately in your browser.
DeveloperFreeRuns locallyOpen - Live
XML formatter
Pretty-print, minify, and validate XML — entirely in your browser.
DeveloperFreeRuns locallyOpen - Live
GraphQL formatter
Pretty-print and validate GraphQL queries, mutations, and schemas — privately in your browser.
DeveloperFreeRuns locallyOpen - Live
JSON Schema validator
Validate JSON data against a JSON Schema — see every error with its path — privately in your browser.
DeveloperFreeRuns locallyOpen - Live
HTTP status code lookup
Look up any HTTP status code — 1xx through 5xx — with a plain-English description.
DeveloperFreeRuns locallyOpen - Live
MIME type lookup
Look up MIME types by file extension or search by content type — covers images, video, audio, documents, and fonts.
DeveloperFreeRuns locallyOpen - Live
Unix Timestamp Converter
Convert Unix epoch timestamps to human dates and back — auto-detects seconds, milliseconds, micro- and nanoseconds, with a live ticking clock.
DeveloperFreeRuns locallyOpen - Live
Discord Timestamp Generator
Turn any date and time into all seven Discord t:unix:F timestamp formats with a live preview of how each one renders, one tap to copy.
DeveloperFreeRuns locallyOpen - Live
Chmod Calculator
Convert between chmod octal (755), symbolic (rwxr-xr-x) and a checkbox permission grid — all stay in sync, with setuid/setgid/sticky bits and common presets.
DeveloperFreeRuns locallyOpen - Live
Subnet Calculator
Enter an IPv4 CIDR like 192.168.1.0/24 and get network, broadcast, first/last usable host, host count, netmask, wildcard mask, and a binary view — /31 and /32 handled correctly.
DeveloperFreeRuns locallyOpen - Live
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal simultaneously — plus any custom base 2–36 — with big-integer support, negatives, and digit grouping.
DeveloperFreeRuns locallyOpen