Developer Tools
JSON, regex, JWT, hash and code utilities
17 tools available
Code Tools
3 toolsData Tools
1 toolSEO Tools
2 toolsOther
10 toolsRegex Tester
PopularTest regular expressions in real-time
JWT Decoder
Decode and inspect JWT tokens
HTML Formatter
Format and beautify HTML code
CSS Formatter
Format and beautify CSS code
JS Formatter
Format and beautify JavaScript code
SQL Formatter
Format and beautify SQL queries
XML Validator & Formatter
Validate, format, and minify XML data
YAML Validator & Converter
Validate YAML and convert to/from JSON
Cron Expression Generator
Generate and explain cron expressions
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text
About Developer Tools
Format, validate and inspect JSON, XML, YAML, HTML, CSS, JS and SQL; test regular expressions, decode JWTs, generate UUIDs and hashes, and convert data formats — the everyday developer toolkit.
Paste any snippet and receive results in real time. Everything runs locally, so sensitive code and data never leave your machine. Free, unlimited and no signup required.
Frequently Asked Questions
Which languages and formats are supported?▾
JSON, XML, YAML, HTML, CSS, JavaScript, SQL and CSV formatting/validation, plus regex testing, JWT inspection, cron building, UUID/hash generation and markdown editing.
Is it safe to paste production code or tokens?▾
Formatting, validation and decoding all execute locally in your browser - nothing is transmitted or logged. Still, general security practice suggests minimising where production secrets appear.
Does formatting change my code's behaviour?▾
No. Formatters only adjust whitespace and indentation; minification modes preserve semantics too. Validators report errors without altering your input.
Can I use these tools inside my workflow?▾
Yes - paste from editors, terminals or CI logs freely. Output copies back as plain text ready for commits, configs or documentation.