Free Online Formatter and Validator Tools

Format, validate, minify, inspect, and compare JSON, CSV, SQL, HTML, XML, YAML, JavaScript, regex patterns, and text.

Format, validate, or minify JSON without leaving the page.

Text Diff Checker

Compare two text blocks and see changed lines.

Test JavaScript regex patterns against sample text.

String Case Converter

Convert text to camelCase, snake_case, kebab-case, and more.

HTML/XML Formatter

Format or minify HTML and XML markup.

Check SQL syntax and catch common query risks before running it.

Validate JavaScript, JSX, TypeScript, and TSX snippets.

Validate YAML syntax and preview parsed YAML as JSON.

Validate XML syntax, inspect structure, and format XML.

Regex Generator

Generate regex patterns from common templates and examples.

Explore, search, and validate JSON as a collapsible tree.

Encode or decode HTML entities and special characters.

Text Statistics

Count words, characters, lines, reading time, and top words.

Preview HTML snippets in a sandboxed browser frame.

Validate CSS syntax with csstree and inspect rules.

Format or minify CSS stylesheets and snippets.

Preview sanitized SVG markup and inspect basic details.

Validate HTML syntax, structure, and common markup issues.

Validate CSV rows, delimiters, headers, and quoted fields.

JavaScript Minifier

Minify JavaScript snippets with Terser.

Formatters workflows

These formatter, validator, and minifier tools help make code, markup, and structured data easier to read before debugging, reviewing, sharing, or deploying.

Use a formatter, validator, or minifier when a snippet is hard to read, copied from logs, or failing because of a small syntax mistake.

Common starting points

JSON Formatter - Format, validate, or minify JSON without leaving the page.Text Diff Checker - Compare two text blocks and see changed lines.Regex Tester - Test JavaScript regex patterns against sample text.String Case Converter - Convert text to camelCase, snake_case, kebab-case, and more.HTML/XML Formatter - Format or minify HTML and XML markup.SQL Validator - Check SQL syntax and catch common query risks before running it.