Developer & Code Tools
Every tool a web developer reaches for daily, collected in one place. Format minified code, compare file versions side-by-side, test regular expressions with live highlighting, decode JWTs, and generate API request snippets — all without leaving your browser or installing anything.
Browse all 100+ Tools18 Developer & Code Tools
JSON Formatter
Format, validate, and minify JSON online with colour syntax highlighting and TypeScript interface…
Developer & Code ToolsXML Formatter
Format, validate, and minify XML online with syntax highlighting and XPath query support.
Developer & Code ToolsHTML Beautifier
Format messy HTML with proper indentation, detect missing alt attributes and deprecated tags.
Developer & Code ToolsCSS Beautifier
Format minified CSS, sort properties alphabetically, extract colour variables, and minify stylesh…
Developer & Code ToolsJavaScript Formatter
Beautify or minify JavaScript using js-beautify, choose indent size and quote style.
Developer & Code ToolsSQL Formatter
Beautify SQL queries with proper indentation, keyword casing, and danger warnings for DROP/DELETE.
Developer & Code ToolsSQL Minifier
Compress SQL by removing comments and collapsing whitespace to a single line.
Developer & Code ToolsSQL Query Builder
Visually generate SELECT, INSERT, UPDATE, and DELETE queries without writing code.
Developer & Code ToolsPHP Formatter
Format messy PHP scripts into a clean, readable structure with proper indentation.
Developer & Code ToolsCode Diff Tool
Compare two code blocks line-by-line with LCS algorithm, see additions and deletions, generate un…
Developer & Code ToolsText Compare
Compare two documents side-by-side with LCS diff, see added and removed lines, download unified d…
Developer & Code ToolsHTML Entity Encoder
Encode text to named, decimal, or hex HTML entities and decode entities back to UTF-8.
Developer & Code ToolsRegex Tester
Test regular expressions with live match highlighting, capture group table, and find-and-replace.
Developer & Code ToolscURL Command Builder
Visually configure HTTP requests and instantly generate cURL, Fetch, Axios, and Python code.
Developer & Code ToolsHTTP Header Viewer
Inspect HTTP response headers for any URL, get an A–F security grade, and see plain-English expla…
Developer & Code ToolsMarkdown Previewer
Live Markdown editor with formatting toolbar, split layout, and instant GitHub README preview.
Developer & Code ToolsMarkdown to HTML
Convert Markdown to clean semantic HTML for blogs, websites, and CMSs, with live preview.
Developer & Code ToolsHTML to Markdown
DOM-based HTML to Markdown converter that handles headings, tables, code blocks, and full webpages.
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