JSON Formatter
Beautify, minify and sort JSON with exact error locations.
Open Tool
Developer Tools
Free Developer Tools Online
Useful browser-based tools for developers, programmers and technical users. These utilities are designed to process data locally whenever practical.
JSON Validator & Fixer
Find JSON errors and repair common mistakes automatically.
Open ToolBase64 Encoder & Decoder
Encode and decode text, files and images, including URL-safe Base64.
Open ToolJWT Decoder
Read token headers and claims and check expiry.
Open ToolRegex Tester
Live match highlighting, capture groups and replace.
Open ToolRegex Generator
Ready-made patterns for emails, phones, dates and more.
Open ToolUUID Generator
Bulk v4 and v7 UUIDs, GUID formats and a validator.
Open ToolHTML Formatter
Beautify or minify HTML, including inline CSS and JS.
Open ToolCSS Formatter & Minifier
Indent stylesheets or compress them for production.
Open ToolJavaScript Formatter
Unminify and indent JavaScript, JSON and JSX.
Open ToolSQL Formatter
Beautify MySQL, PostgreSQL, SQL Server and more.
Open ToolSQL Generator
CREATE TABLE, SELECT, INSERT, UPDATE and DELETE statements.
Open ToolCSV to JSON
Convert CSV, TSV and Excel data to JSON.
Open ToolJSON to CSV
Turn JSON arrays into Excel-ready CSV files.
Open ToolJSON to XML
Convert JSON to well-formed, indented XML.
Open ToolXML Formatter & Validator
Pretty print, minify and check XML.
Open ToolMarkdown to HTML
Convert GitHub Flavored Markdown with live preview.
Open ToolAPI Request Generator
cURL, fetch, Axios, Python and PHP request code.
Open ToolDeveloper Tools That Keep Your Code Private
Every ConverterFox developer tool runs entirely in your browser. API responses, tokens, SQL queries and source code are processed on your device and never uploaded, so you can safely paste production data while debugging.
Data formats
Format and validate JSON with the JSON Formatter and JSON Validator, move data between formats with CSV to JSON, JSON to CSV and JSON to XML, and tidy documents with the XML Formatter.
Code formatting
Beautify front-end code with the HTML, CSS and JavaScript formatters, and make long queries readable with the SQL Formatter.
Debugging and APIs
Inspect tokens with the JWT Decoder, encode data with Base64, build patterns with the Regex Tester and Regex Generator, and generate request code with the API Request Generator.