Developer Tools
Handy utilities for developers — format JSON, encode and decode Base64, hash and decode tokens, test regular expressions, convert timestamps and colors, and more. Fast, private and free.
JSON Formatter & Validator
Format and validate your JSON data
UUID & ULID Generator
Generate UUID v4, v7 and ULID in bulk
Hash Generator
MD5, SHA-1, SHA-256 and SHA-512 hashes
Base64 Encoder/Decoder
Encode and decode Base64 text instantly
Unix Timestamp Converter
Convert Unix timestamps to readable dates
Color Converter & Picker
Convert HEX, RGB, HSL, OKLCH + contrast checker
CPF/CNPJ Validator
Validate Brazilian CPF and CNPJ numbers
Regex Tester
Test regular expressions with live match highlighting
JWT Decoder
Decode JWT header and payload safely
Markdown to HTML
Convert Markdown into clean HTML instantly
URL Encoder / Decoder
Percent-encode or decode URLs and query strings
HTML Entity Encoder / Decoder
Escape or unescape HTML special characters
YAML ⇄ JSON Converter
Convert between YAML and JSON instantly
XML Formatter
Beautify or minify XML in your browser
CSV ⇄ JSON Converter
Convert CSV to JSON and back in your browser
JSON Diff
Compare two JSON documents side by side
CSS Unit Converter
Quickly convert between rem, px, em, pt, and other CSS units
Essential Developer Utilities, Right in Your Browser
Modern development involves a constant stream of small but time-consuming tasks: formatting a JSON payload from an API response, decoding a Base64 string, computing an SHA-256 hash for a checksum, generating a collision-free UUID, decoding a JWT to inspect its claims, testing a regular expression against sample input, converting a Unix timestamp to a readable date, translating hex colors to RGB, encoding URL parameters, escaping HTML entities, converting between YAML and JSON, formatting XML, transforming CSV to JSON, and comparing two JSON objects to spot differences. Fastway Tools collects all sixteen of these utilities in one place so you can reach for them instantly without switching context to a different site or writing a throwaway script.
Every tool in this category runs entirely in your browser — no payloads are sent to a server, which means you can safely paste real API responses, internal tokens, or production configuration snippets without exposing them. The tools also work without any account, extension, or software installation, making them reliable companions on any machine, including shared or locked-down developer environments.
Developers frequently work with structured data in multiple formats. These utilities handle JSON validation and formatting, encoding/decoding tasks, hashing, regex testing, and working with API tokens and JWTs — all running locally so you can work with sensitive data without privacy concerns.