Tool category
Free Online Developer Tools
Developer tools keep common text operations close at hand, with local processing and clear warnings for sensitive inputs.
26 tools in this category
JSON Formatter
JSON Formatter lets you format JSON with readable indentation locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolJSON Validator
JSON Validator lets you validate JSON syntax locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolJSON Minifier
JSON Minifier lets you minify JSON into compact output locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolJWT Decoder
JWT Decoder lets you decode JWT header and payload sections locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolBase64 Encode Decode
Base64 Encode Decode lets you encode or decode Base64 text locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolURL Parser
URL Parser lets you break a URL into its parts locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolRegex Tester
Regex Tester lets you test a regular expression against local text locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolSQL Formatter
SQL Formatter lets you format common SQL snippets locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolUUID Generator
UUID Generator lets you generate UUID v4 values locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolHash Generator
Hash Generator lets you generate SHA hash values from text locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolDiff Checker
Diff Checker lets you compare two text blocks line by line locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolYAML Validator
YAML Validator lets you validate practical YAML syntax locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolTOML Formatter
TOML Formatter lets you format simple TOML snippets locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolMarkdown Table Generator
Markdown Table Generator lets you generate Markdown tables locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolCron Expression Explainer
Cron Expression Explainer lets you explain standard five-field cron expressions locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolcURL Formatter
cURL Formatter lets you summarize common curl command flags locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolHTTP Header Parser
HTTP Header Parser lets you parse HTTP response headers into a table locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolLog Prettifier
Log Prettifier lets you prettify JSON lines and plain logs locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolHTML Entity Encoder Decoder
HTML Entity Encoder Decoder lets you encode or decode HTML entities locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolURL Encode Decode
URL Encode Decode lets you encode or decode URL text locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolJSON to TypeScript
JSON to TypeScript lets you infer TypeScript interfaces from JSON locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolJSON Path Tester
JSON Path Tester lets you test a simple JSON path against JSON locally in your browser with sample input, copy, download, and privacy-first controls.
Open toolPassword Generator
Generate strong, random passwords with custom length and character sets — entirely in your browser. No data is sent anywhere.
Open toolColor Converter
Convert colors between HEX, RGB, and HSL formats instantly in your browser. Visual color preview and one-click copy for each format.
Open toolNumber Base Converter
Convert numbers between decimal, binary, octal, and hexadecimal instantly. Type in any base and all others update automatically.
Open toolUnix Timestamp Converter
Convert Unix timestamps to human-readable dates, or convert dates to Unix timestamps. Shows local time, UTC, ISO 8601, and relative time.
Open toolHow this category works
Developer tools include local utilities for JSON, Base64, URLs, headers, hashes, diffs, regex, UUIDs, passwords, color conversion, number bases, Unix timestamps, and more — all processing input client-side.
Related categories
Frequently asked questions
Do developer tools send snippets away from my browser?
Local developer tools process input in the browser unless a page explicitly says otherwise.
Are validators a security guarantee?
No. Validators are helpful checks, but they do not replace a review of your own application or deployment.