Developer tools
Formatters, converters and debuggers for the data you handle every day. Everything runs locally, so it is safe for API responses and tokens you would not paste into a server.
- 20 free tools
- No sign-up
- Runs in your browser
- Most usedJSON FormatterFormat, beautify and validate JSON with 2-space, 4-space or tab indentation. Shows the line and column of syntax errors. Runs locally.Open tool
- Most usedRegex TesterTest JavaScript regular expressions against sample text with live match highlighting, capture groups and replace preview.Open tool
- JWT DecoderDecode a JWT to see its header and payload, with issued-at and expiry times in readable form. The token never leaves your browser.Open tool
- Unix Timestamp ConverterConvert Unix epoch timestamps in seconds or milliseconds to IST, UTC and your local time, and convert dates back to timestamps.Open tool
- JSON ValidatorValidate JSON and pinpoint syntax errors by line and column, with hints for common mistakes like trailing commas and single quotes.Open tool
- JSON to CSV ConverterConvert a JSON array of objects to CSV for Excel or Google Sheets. Nested objects are flattened into dotted column names.Open tool
- CSV to JSON ConverterConvert CSV to a JSON array of objects using the header row as keys. Handles quoted fields, commas inside quotes and custom delimiters.Open tool
- SQL FormatterFormat SQL queries with consistent indentation and keyword case for MySQL, PostgreSQL, SQL Server, SQLite, BigQuery and more.Open tool
- JSON MinifierMinify JSON by removing all whitespace and line breaks. Shows the size before and after so you can see the saving.Open tool
- HTML MinifierMinify HTML by removing comments and collapsing whitespace, while leaving <pre>, <textarea>, <script> and <style> content intact.Open tool
- CSS MinifierMinify CSS by removing comments, whitespace and the last semicolon in each block. Shows size savings.Open tool
- JavaScript MinifierMinify JavaScript by removing comments, indentation and extra spaces while keeping strings, regex and template literals intact. See the size saved.Open tool
- Markdown to HTMLConvert Markdown, including GitHub-flavoured tables and task lists, to clean HTML with a live preview.Open tool
- JSON to YAML ConverterConvert JSON to clean, readable YAML for config files, Kubernetes and CI pipelines.Open tool
- YAML to JSON ConverterConvert YAML to JSON and validate YAML syntax. Works with Kubernetes manifests, GitHub Actions and Docker Compose files.Open tool
- JSON to XML ConverterConvert JSON to well-formed, indented XML. Arrays become repeated elements and keys starting with @ become attributes.Open tool
- XML to JSON ConverterConvert XML to JSON. Attributes become @-prefixed keys and repeated elements become arrays. Uses your browser's XML parser.Open tool
- JSON to TypeScriptGenerate TypeScript interfaces from a JSON sample. Nested objects become their own interfaces and arrays get proper element types.Open tool
- JSON CompareCompare two JSON documents and list every added, removed and changed value by its path. Key order is ignored.Open tool
- CSS BeautifierFormat minified or messy CSS with one declaration per line and consistent indentation, including media queries.Open tool