Developer tools

50+ free tools for developers.

Every tool runs in your browser. No signup, no limits.Format, convert, validate, minify and inspect — every tool runs in your browser. No signup, no limits.

52 of 52 tools

Format & beautify

JSON FormatterFormat and validate JSON with syntax highlighting.YAML FormatterBeautify YAML with configurable indentation.XML FormatterFormat, indent and beautify XML documents.SQL FormatterFormat and beautify SQL queries with 20+ dialects.CSS FormatterBeautify CSS, SCSS and Less with configurable style.HTML FormatterBeautify HTML with proper indentation and attributes.JavaScript FormatterBeautify JavaScript with ES2024+ and JSX support.TypeScript FormatterFormat TypeScript with configurable quotes.GraphQL FormatterFormat GraphQL schemas and queries.

Convert

JSON ↔ YAMLConvert between JSON and YAML instantly.JSON ↔ XMLConvert between JSON and XML with custom roots.JSON ↔ CSVConvert between JSON and CSV with nested objects.JSON → TypeScriptGenerate TypeScript interfaces and type aliases.JSON → SQLGenerate SQL INSERT statements from JSON arrays.CSV → JSONConvert CSV, TSV or semicolon-delimited data.CSV ↔ XMLConvert between CSV and XML with configurable fields.CSV → SQLGenerate SQL INSERT statements from CSV files.XML → JSONConvert XML documents to clean, structured JSON.XML → YAMLConvert XML documents to YAML automatically.YAML → JSONConvert YAML to JSON instantly.YAML ↔ XMLConvert between YAML and XML formats.TOML ↔ JSONConvert between TOML and JSON with nested tables.TOML ↔ YAMLConvert between TOML and YAML.Markdown ↔ HTMLConvert Markdown to HTML and HTML to Markdown.HTML → JSXConvert HTML to JSX for React — classes transform.CSS → SCSSConvert flat CSS to safely nested SCSS.Less → CSSCompile Less stylesheets to CSS online.Base64 Encoder/DecoderEncode and decode Base64 strings instantly.

Validate

JSON ValidatorValidate JSON syntax in real time with line-precise errors.YAML ValidatorValidate YAML files with inline error markers.XML ValidatorValidate XML documents for well-formedness.HTML ValidatorCheck HTML for unclosed tags and missing attributes.CSS ValidatorValidate CSS syntax and detect unclosed blocks.JSON Schema ValidatorValidate JSON data against a JSON Schema.

Minify

JSON MinifierMinify JSON to a compact single-line string.JavaScript MinifierMinify JavaScript by removing whitespace and comments.TypeScript MinifierMinify TypeScript by removing whitespace.CSS MinifierMinify CSS by stripping comments and whitespace.HTML MinifierMinify HTML by removing comments and collapsing space.SQL MinifierCompress SQL queries by stripping comments.XML MinifierMinify XML by stripping comments and collapsing space.

Generate

Mock Data GeneratorGenerate realistic test data in JSON, CSV, SQL and more.

Inspect & view

JSON ViewerExplore JSON as a collapsible, colour-coded tree.YAML ViewerVisualise YAML documents as an interactive tree.XML ViewerBrowse XML files as a collapsible element tree.CSV ViewerView CSV and TSV files as an interactive table.HTML ViewerPreview HTML live in a sandbox at phone, tablet and desktop widths.SVG ViewerPreview, edit and zoom SVG graphics with live rendering.JavaScript AST ViewerExplore JavaScript and TypeScript as a collapsible AST.JWT DecoderDecode and inspect JSON Web Tokens.

Test

Regex TesterTest regular expressions with real-time highlighting.

Write

Markdown EditorWrite and preview Markdown with live rendering.

Need to run code?Need to run code, not just transform it?

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