Developer Tools
Developer tools cover JSON formatting and validation, regex testing, CSS unit conversion, color conversion, and day-to-day frontend and backend debugging tasks, helping you inspect data and move faster.
JSON Formatter & Validator
JSON Formatter & Validator formats, validates, minifies, and sorts standard JSON locally with line/column errors, Tab/2/4/8 indentation, desktop preview, and plain copy.
LocalJSON Repair & Inspector
Repair malformed JSON locally, review risk warnings, compare the before and after text, and inspect the repaired structure.
LocalJSON to TypeScript
JSON to TypeScript converts JSON samples into TypeScript interfaces and type aliases locally, with optional fields, union/null/Date inference, root naming, and .ts copy/download.
LocalJSON ↔ YAML Converter
JSON ↔ YAML Converter converts YAML to JSON and JSON to YAML locally with side-by-side sync, syntax-only validation, key sorting, indent controls, multi-document YAML, and copy/download.
LocalJSON ↔ CSV Converter
Convert CSV, TSV, and JSON locally with file import, JSON Lines, 2D arrays, nested object flattening, delimiter detection, and copy/download output.
LocalJWT Decoder
Decode standard three-part JWTs locally, inspect formatted header and payload JSON, copy the raw signature, and check exp/nbf/iat timing without verification.
LocalRegex Tester
Test JavaScript regular expressions locally with g/i/m/s/u/y flags, match counts, line-column ranges, capture groups, named groups, and native replace preview.
LocalMIME Type Lookup
Look up MIME types from file extensions, filenames, and media types, then copy MIME or Content-Type header values locally.
LocalHTTP Status Codes
Look up HTTP status codes, status lines, related headers, and cache notes locally.
LocalCSS Unit Converter
Convert CSS units one-to-one between px, rem, em, %, vw, vh, vmin, vmax, pt, pc, in, cm, mm, q, ex, and ch locally using root font size, EM reference font size, viewport, and percentage reference settings. Absolute CSS units use the fixed ratio 1in = 96px.
LocalColor Converter
Convert one color locally between 6-digit HEX (#RRGGBB), RGB, HSL, and CMYK with a color picker, random color, live preview, channel controls, copy-ready HEX/RGB/HSL CSS values, and CMYK reference notation.
LocalLorem Generator
Generate plain-text Lorem Ipsum locally by paragraph, word, or target character count, with an optional Lorem start, one-click copy, and text stats for design and development placeholders.
LocalCron Expression Parser
Parse and validate 5-, 6-, and 7-field cron expressions locally, inspect the field breakdown, preview timezone-aware next runs, read a human-readable description, use presets, and copy the current expression for crontab, CI/CD, and scheduled jobs.
LocalTool Categories