Dev Tools
26 free, privacy-first developer utilities that run entirely in your browser. No accounts, no uploads, no tracking — open a tool and use it instantly.
- Runs in your browser
- No upload, no tracking
- Free forever
JSON Formatter
Prettify, minify, sort keys and validate JSON with precise error reporting — entirely in your browser.
SQL Formatter
Beautify or minify SQL with dialect-aware formatting for PostgreSQL, MySQL, and more.
XML Formatter
Pretty-print or minify XML with validation and line-numbered error reporting.
Docker Compose Formatter
Beautify, validate and minify docker-compose YAML files. Browser-only, no uploads.
YAML ↔ JSON Converter
Convert between YAML and JSON with validation and pretty-printing. Supports full YAML 1.2.
CSV ↔ JSON Converter
Convert CSV to JSON arrays or JSON back to CSV. Paste directly or upload a file.
Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case and more in real time.
Color Converter
Convert colors between HEX, RGB and HSL with a live swatch and picker.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports seconds and milliseconds.
Diff Checker
Compare text side-by-side with line and character-level diffing. Nothing leaves your browser.
UUID Generator
Generate cryptographically random UUID v4 values in bulk. Copy one or the whole batch.
Password Generator
Generate cryptographically secure passwords with configurable length and character sets.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes using browser-native Web Crypto.
Bcrypt Generator
Generate and verify bcrypt hashes locally with adjustable salt rounds. No data transmitted.
JWT Generator
Generate and sign JWT tokens locally with HS256. Edit header, payload and secret live.
QR Code Generator
Generate QR codes from any text or URL and download them as PNG. Adjustable size.
Cron Generator
Build and explain cron expressions in plain English with the next scheduled run times.
JSON → TypeScript
Generate typed TypeScript interfaces from JSON. Handles nested objects and arrays automatically.
JSON → C# Classes
Generate C# model classes from JSON with PascalCase and System.Text.Json attributes.
JSON → Dart Models
Generate null-safe Dart model classes from JSON with fromJson/toJson for Flutter.
JSON → Zod Schema
Generate typed Zod schemas from JSON. Supports nested objects, arrays and strict mode.
JSON Schema Generator
Generate JSON Schema (draft 2020-12) from any JSON object, with nested object support.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 strings back to plain text instantly.
URL Encoder / Decoder
Percent-encode URLs or decode encoded URL strings with real-time conversion.
JWT Decoder
Decode JWT tokens and inspect header and claims without sending tokens anywhere.
Regex Tester
Test regular expressions live with match highlighting, capture groups and replace preview.
Built by a managed database operations team
Every tool here runs entirely in your browser — your data is never uploaded, logged or tracked, so it is safe to paste production payloads, tokens and PII. JusDB builds and maintains these for the everyday work that surrounds running databases: formatting query output, decoding tokens, generating keys and converting config. They are free forever, with no sign-up.