Developer Tools
58 tools · 58 available now
Format, validate, convert, and inspect code and data. JSON, Base64, JWT, regex, hashes, UUIDs, and dozens more developer essentials.
JSON Formatter
Format, validate, and minify JSON instantly.
JSON to CSV
Convert JSON arrays into CSV, flattening nested data.
CSV to JSON
Convert CSV data into structured JSON.
JSON to XML
Convert JSON into well-formed XML.
XML to JSON
Convert XML documents into JSON.
XML Formatter
Pretty-print and indent messy XML.
YAML to JSON
Convert YAML into JSON.
JSON to YAML
Convert JSON into readable YAML.
Base64 Encoder & Decoder
Encode and decode Base64, with full UTF-8 support.
URL Encoder & Decoder
Encode and decode URL-safe text.
HTML Encoder & Decoder
Encode and decode HTML entities.
JWT Decoder
Decode and inspect JSON Web Token headers and payloads.
Regex Tester
Test regular expressions with live match highlighting.
UUID Generator
Generate v1 and v4 UUIDs in bulk.
ULID Generator
Generate sortable, time-based ULIDs.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
HMAC Generator
Generate HMAC signatures with the Web Crypto API.
HTML to Markdown
Convert HTML into clean Markdown.
Markdown to HTML
Convert Markdown into HTML.
CSS Minifier
Minify CSS to shrink stylesheet size.
CSS Beautifier
Format and indent minified CSS.
JavaScript Minifier
Minify JavaScript to reduce file size.
JavaScript Beautifier
Format and indent minified JavaScript.
HTML Minifier
Minify HTML markup for faster pages.
HTML Beautifier
Format and indent messy HTML.
Cron Expression Builder
Build and explain cron expressions in plain English.
JSONPath Tester
Test JSONPath queries against a JSON document.
Timestamp to Date
Convert Unix timestamps into readable dates.
Date to Timestamp
Convert dates into Unix timestamps.
SQL to JSON
Convert SQL INSERT statements into JSON.
JSON Schema Generator
Infer a JSON Schema from a sample document.
ASCII Table Reference
Browse the full ASCII character reference table.
HTTP Status Codes
Look up every HTTP status code and its meaning.
HTTP Headers Reference
Reference common HTTP request and response headers.
MIME Type Lookup
Look up MIME types by file extension.
EyeDropper Color Picker
Pick any color on screen with the EyeDropper API.
CSS Gradient to Image
Render a CSS gradient as a downloadable image.
SVG to PNG
Convert SVG files into raster PNG images.
SVG Optimizer
Optimise and shrink SVG file size.
HEX to CSS Filter
Convert a HEX color into a CSS filter for recoloring SVGs.
CSS Specificity Calculator
Calculate the specificity of any CSS selector.
CSS Unit Converter
Convert between px, em, rem, and percentage units.
RGBA to HEX Converter
Convert RGBA colors into 8-digit HEX with alpha.
Lorem Ipsum JSON
Generate realistic placeholder JSON data.
JSON Diff Viewer
Compare two JSON documents side by side.
Base64 Decoder
Decode Base64 strings back to UTF-8 text in your browser.
URL Decoder
Decode percent-encoded URLs and query strings.
HTML Decoder
Decode HTML entities back to plain text.
TOTP Generator
Generate RFC 6238 time-based one-time passwords with a live counter.
OTP Generator
Generate cryptographically random one-time numeric codes (4/6/8 digits).
bcrypt Generator
Hash and verify passwords with bcrypt at a configurable cost factor.
RSA Key Pair Generator
Generate RSA public and private key pairs as PEM files.
BIP-39 Generator
Generate BIP-39 mnemonic phrases for crypto wallet seeds.
MAC Address Generator
Generate random MAC addresses with vendor OUI prefixes and format options.
HTTP Basic Auth Generator
Build the HTTP Basic Auth Authorization header from a user and password.
Random Token Generator
Generate secure random tokens — alphanumeric, hex, base64url or URL-safe.
Math Expression Evaluator
Safely evaluate math expressions with variables, parentheses and functions.
ISO Time Converter
Convert between ISO-8601, Unix timestamps and human-readable dates.
About developer tools
Developers paste API responses, tokens, and config files into online tools constantly — and that data is often confidential. ToolJutsu's developer tools format and validate JSON, convert between JSON, CSV, XML, and YAML, decode JWTs, test regular expressions, generate hashes and UUIDs, and beautify or minify CSS, JS, and HTML. All of it executes client-side, so a JWT or production payload pasted into ToolJutsu never reaches a server. It is the kind of tool suite you can safely use on work code.
Every tool in this category runs entirely on your device. Your files and inputs are never uploaded to a server — there is no server in the loop that touches your data. That makes ToolJutsu a genuinely private way to get everyday tasks done. New tools in this category go live as the project progresses; cards marked “Soon” are on the roadmap.