{ }Online formatting & dev tools
This category gathers formatting and development tools: JSON formatter and validator, SQL beautifier, regex tester and JSON to TypeScript type generator. Save time formatting and validating your code right in the browser, for free.
Convert HTML into React JSX (class → className, camelCase attributes, style object, comments).
Format, indent, minify and validate JSON. 100% client-side.
Minify JSON (strip whitespace and line breaks) to reduce its size.
Generate JSDoc typedefs (@typedef) from JSON, to document and type your JS code.
Generate a TypeScript interface from a JSON object, including nested types.
Check whether your JSON is valid and pinpoint the first error precisely.
Convert Markdown to HTML with a live preview, in your browser.
Test a regular expression: matches, capture groups (indexed and named) and a replacement mode.
Format and indent a SQL query (multiple dialects) in your browser.
Escape a string for JSON, JavaScript, shell or HTML without quote errors.
Turn an SVG into a ready-to-use React/JSX component (camelCase attributes, custom name).
Check that an XML document is well-formed and display syntax errors.
Test an XPath expression against XML or HTML and inspect the matching nodes.
Frequently asked questions
How do I validate and format JSON online?
Paste your JSON into the formatter: it indents, highlights and flags syntax errors instantly, without sending your data to a server.
Can I generate TypeScript interfaces from JSON?
Yes, the JSON to TypeScript tool automatically infers types and interfaces from a JSON object, ready to paste into your project.