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Developer Tools
Format, validate, convert and inspect JSON, XML, CSV, HTML, CSS, JavaScript and encoded text. Choose from 28 utilities in this category and open the tool that matches your task.
Browse developer tools
JSON Formatter
Pretty-print JSON with readable indentation.
JSON Validator
Validate JSON syntax and report parsing errors.
JSON Minifier
Remove unnecessary whitespace from valid JSON.
JSON to CSV
Convert an array of JSON objects into CSV locally.
CSV Cleaner
Trim cells, remove blank rows and normalise CSV data.
CSV Duplicate Remover
Remove duplicate CSV rows based on all columns or one column.
XML Formatter
Format XML with readable indentation.
XML Minifier
Remove unnecessary whitespace between XML tags.
XML to JSON
Convert XML elements and attributes into JSON.
HTML Formatter
Pretty-print HTML markup with readable indentation.
HTML Minifier
Remove comments and unnecessary whitespace from HTML.
CSS Minifier
Compress CSS by removing comments and extra whitespace.
JavaScript Minifier
Conservatively reduce JavaScript whitespace and comments.
Base64 Encoder
Encode UTF-8 text into Base64.
Base64 Decoder
Decode Base64 text back into UTF-8.
URL Encoder
Percent-encode text for use in URL components.
URL Decoder
Decode percent-encoded URL text.
HTML Entity Encoder
Escape text for safe display as HTML text.
HTML Entity Decoder
Convert HTML entities back into normal text.
Regex Tester
Test JavaScript regular expressions against sample text.
JWT Decoder
Decode JWT header and payload sections without verifying the signature.
SQL Formatter
Format common SQL statements with line breaks and indentation for easier reading.
HEX RGB HSL Color Converter
Convert colours between HEX, RGB and HSL formats.
Cron Expression Helper
Build common five-field cron expressions from simple scheduling options.
JSON Diff
Compare two JSON values and list changed paths.
CSV Sorter
Sort CSV rows by a selected column while keeping the header row.
CSV Filter
Filter CSV rows that contain a value in a selected column.
JSON Path Finder
Search JSON keys and values and return matching dot-style property paths.
Browser-based developer and data utilities
The Developer Tools collection focuses on common text-based development tasks: format and validate JSON, minify JSON, convert JSON to CSV, clean CSV data, remove duplicate rows, format or minify XML and HTML, convert XML to JSON, minify CSS and JavaScript, encode or decode Base64 and URLs, handle HTML entities and test regular expressions.
Because these utilities work on pasted text in the browser, they are useful for quick debugging, API payload inspection, configuration cleanup and data transformations. They are not a substitute for a full IDE, compiler or security review, so production code and sensitive secrets should still be handled with appropriate development controls.
Popular tools in this category
Why Kaazo uses task-specific tool pages
Each utility has a descriptive permanent URL, a single primary purpose, step-by-step instructions, relevant FAQs and links to closely related tools. This structure makes the collection easier for people to navigate and gives search engines clearer context about the purpose of each page without relying on one generic converter URL.