Developer & Data

Developer and data utilities for everyday work — format, convert, validate and inspect JSON, write and test regular expressions, decode tokens, generate UUIDs and types, and clean up code. Every tool runs entirely in your browser using built-in parsers and Web Crypto, so your payloads, schemas and secrets never leave your device.

25 Developer & Data tools

• JSON Sanitizer & Transformer — Auto-fix broken JSON, mask secrets, convert to YAML or CSV.
• CSV → JSON Table Previewer — Parse CSV into a typed table and export clean JSON live.
• Regex Explainer & Tester — Plain-English breakdown with live, highlighted matches.
• SVG Optimizer & Vectorizer — Shrink SVG payloads and copy clean React/HTML components.
• Code Beautifier & Minifier — Auto-detect HTML, CSS or JS — format or compress in one panel.
• NL → SQL Builder — Describe a query in plain English; a local model writes the SQL — your schema stays private.
• YAML ⇄ JSON ⇄ TOML — Convert between YAML, JSON and TOML in either direction.
• Base64 Encoder / Decoder — Encode/decode text & files, URL-safe, with data-URI output.
• HTML Entity Encoder / Decoder — Encode or decode HTML entities — named, decimal or hex.
• UUID & ULID Generator — Bulk UUID v4/v7 and ULID, generated with crypto randomness.
• Number Base Converter — Convert between binary, octal, decimal, hex & any base with BigInt.
• Cron Expression Builder — Build & explain cron schedules in plain English with next run times.
• Mock Data Generator — Generate realistic fake names, emails, addresses & JSON/CSV fixtures for testing.
• JSON Diff & Compare — Compare two JSON documents by structure — see added, removed & changed keys.
• jq & JSONPath Playground — Run jq filters over JSON live, entirely in your browser.
• SQL Formatter & Beautifier — Format & beautify SQL for many dialects — Postgres, MySQL, SQLite & more.
• chmod Permission Calculator — Convert between octal (755) and symbolic (rwxr-xr-x) Unix file permissions.
• .gitignore Generator — Build a .gitignore from common language & tool templates.
• .env ⇄ JSON Converter — Convert .env files to JSON and back — keys stay on your machine.
• cURL → fetch Converter — Turn a curl command into a JavaScript fetch() snippet.
• CSP & Security Header Builder — Compose a Content-Security-Policy + HSTS, X-Frame-Options & more — copy as nginx, Apache or a meta tag.
• File Type & Hex Inspector — See a file’s TRUE type from its magic bytes (not the extension) plus a hex dump — read locally.
• Excel / Spreadsheet Viewer & Converter — Open .xlsx / .xls / .ods / .csv, view every sheet, and export to JSON or CSV — nothing uploaded.
• JSON to TypeScript & Types — Turn sample JSON into TypeScript, Go, Rust, Python, Swift & more type definitions — locally.
• JSON Schema Generator & Validator — Infer a draft-07 JSON Schema from sample data, then validate JSON against it — all in-browser.