What you can do here
Use this category to find focused tools for quick estimates, conversions, cleanup tasks, and formula checks. Open a tool, enter your values, and review the method notes before relying on the result.
Dev
Developer Tools
Local browser tools for JSON, code formatting, hashes, JWTs, timestamps, regex checks, and developer cleanup tasks. Every result in this section runs locally in the browser and links to its formula notes.
36 toolsBrowser-side resultsNo account required
All developer tools
JSON FormatterTransform Data - Format and indent JSON so nested data is easier to read.JSON MinifierTransform Data - Remove JSON whitespace while keeping the same data.JSON ValidatorValidate & Inspect - Check whether pasted JSON can be parsed.JSON to TypeScriptTransform Data - Generate a TypeScript interface from a sample JSON object.CSV to JSON ConverterTransform Data - Convert simple CSV rows into JSON objects.JSON to CSV ConverterTransform Data - Convert an array of JSON objects into CSV.Simple YAML to JSON ConverterTransform Data - Convert simple key-value YAML into JSON.XML to JSON ConverterTransform Data - Convert XML into a readable JSON tree.HTML to Markdown ConverterTransform Data - Convert common HTML tags into lightweight Markdown.JavaScript BeautifierFormat Code - Add readable line breaks around common JavaScript syntax.JavaScript MinifierFormat Code - Remove comments and extra whitespace from JavaScript snippets.CSS BeautifierFormat Code - Format CSS rules into readable blocks.CSS MinifierFormat Code - Remove comments and extra whitespace from CSS.HTML BeautifierFormat Code - Add line breaks and indentation to HTML.HTML MinifierFormat Code - Compact simple HTML by removing extra whitespace.Markdown PreviewerFormat Code - Preview common Markdown as sanitized HTML.Regex TesterValidate & Inspect - Test a JavaScript regular expression against sample text.Code Diff CheckerCompare Files - Compare two text or code snippets line by line.JSON Diff CheckerCompare Files - Compare two JSON values after formatting.ENV Diff ComparatorCompare Files - Compare two .env snippets by variable name.UUID GeneratorGenerate Assets - Generate random UUID values in the browser.Password GeneratorSecurity & Encoding - Generate random passwords locally.Lorem Ipsum GeneratorGenerate Assets - Generate placeholder paragraphs for layouts.SHA-256 Hash GeneratorSecurity & Encoding - Generate a SHA-256 hash from text.SHA-512 Hash GeneratorSecurity & Encoding - Generate a SHA-512 hash from text.JWT DecoderSecurity & Encoding - Decode JWT header and payload without verifying the signature.Base64 Encoder DecoderSecurity & Encoding - Encode text to Base64 or decode Base64 back to text.URL Encoder DecoderSecurity & Encoding - Encode and decode URL component text.HTML Escape UnescapeSecurity & Encoding - Encode or decode HTML entities.Unix Timestamp ConverterScheduling & Time - Convert Unix timestamps to dates and dates to timestamps.ISO 8601 FormatterScheduling & Time - Parse a date and show ISO, UTC, local, and epoch forms.Cron Expression HelperScheduling & Time - Describe simple five-field cron expressions.HTTP Header ParserDebug APIs - Parse raw HTTP headers into JSON.Open Graph Metadata ParserValidate & Inspect - Extract Open Graph and Twitter Card metadata from pasted HTML.ENV ParserDebug APIs - Parse dotenv text into JSON.Secret Leak ScannerSecurity & Encoding - Scan text for common token, key, and credential patterns.