CodeASystem tools
Developer tools, in your browser.
Format payloads, convert schemas, encode data, generate cryptographically secure tokens, and inspect inputs with 100% on-device processing.
Featured tool
JSON Formatter & Validator
Beautify, validate syntax, sort object keys alphabetically, and minify JSON data payloads instantly.
New tool
JSON to YAML Converter
Convert structured JSON data into clean, indented YAML configuration files with custom indent levels.
New tool
YAML to JSON Converter
Parse and transform YAML configuration files, workflows, and manifests into formatted JSON objects.
Security & Auth
JWT Token Debugger
Decode JSON Web Tokens, inspect claims, detect expiration dates, and verify HMAC signatures locally.
New tool
HTML Entity Encoder / Decoder
Escape and unescape HTML special characters, symbols, and entities for safe web rendering.
New tool
Regex Tester & Explainer
Test, debug, and explain regular expressions with live match highlighting and capture group inspection.
Database utility
SQL Formatter & Beautifier
Format, indent, and standardize SQL queries across PostgreSQL, MySQL, SQLite, and BigQuery.
API utility
cURL to Fetch / Axios Converter
Convert raw cURL terminal commands into JavaScript Fetch, Axios, Python Requests, and Go snippets.
Code utility
Code & Text Diff Viewer
Compare two blocks of code or text side-by-side with line and word level diff highlights.
Web utility
CSS Minifier & Beautifier
Compress stylesheets for production or format unreadable CSS rules into clean declarations.
Automation & DevOps
Cron Expression Explainer
Convert cron schedules into plain English sentences and simulate upcoming execution timestamps.
Container DevOps
Dockerfile Best Practices Checker
Lint Dockerfiles against security standards, unpinned base images, root permissions, and caching issues.
Developer utility
Base64 Text & File Encoder
Encode plain text, UTF-8 strings, and local binary files into standard Base64 format.
Developer utility
Base64 Text & File Decoder
Decode Base64 payloads back to readable plain text or download original binary files.
Developer utility
URL Encoder / Decoder
Encode special URI characters or decode URL query parameters with breakdown tables.
Security & Crypto
Hash Generator (SHA-256, SHA-512, MD5)
Calculate cryptographically secure digests for text and files using WebCrypto.
Developer utility
UUID & ULID Generator
Batch generate RFC-4122 UUID v4, timestamp-ordered UUID v7, and ULID identifiers.
Privacy First
Pure browser execution. Zero telemetry.
All data transformation happens on your local machine using standard JavaScript and WebCrypto APIs. Sensitive tokens, keys, and schemas never leave your device.