Developer Tools

Format, convert, and validate developer data — JSON, XML, YAML, and CSV. Most tools run entirely in your browser.

Converters · 20 tools

CSV to JSON Converter

Turn CSV spreadsheet data into structured JSON

Local JSON to XML Converter

Convert JSON data to XML format

Local YAML to JSON Converter

Convert YAML config files to JSON format

Local XML to JSON Converter

Convert XML data to JSON format

Local Base64 Encode/Decode

Encode text to Base64, or decode Base64 back to text

Local URL Encode/Decode

Percent-encode text for a URL, or decode it back

Local Base64 to Image Converter

Turn a Base64 string back into a downloadable image

Local HTML to Markdown Converter

Convert HTML markup to clean Markdown

Local HTML to Text Converter

Strip HTML tags and get the plain text content

Local JSON to CSV Converter

Turn JSON arrays into clean CSV spreadsheets

Local JSON to TypeScript Interface

Turn a JSON sample into TypeScript interface definitions

Local JSON to YAML Converter

Convert JSON config files to YAML format

Local Markdown to HTML Converter

Render Markdown into clean HTML

Local Unix Timestamp Converter

Convert Unix timestamps to readable dates, and back

Local CSV to Excel (XLSX) Converter

Turn CSV data into a real Excel spreadsheet

Local CSV to XML Converter

Turn CSV spreadsheet data into well-formed XML

Local TSV to CSV Converter

Turn tab-separated data into a comma-separated CSV file

Local XML to YAML Converter

Convert XML documents to readable YAML

Local Number Base Converter

Convert numbers between binary, decimal, hex, and octal

Local YAML to XML Converter

Convert YAML config files to well-formed XML

Utilities · 15 tools

JSON Formatter

Pretty-print and indent messy or minified JSON

Local JSON Validator

Check whether JSON is well-formed, with a clear error location

Local JSON Diff

Compare two JSON values and see exactly what changed

Local QR Code Generator

Generate a scannable QR code from text or a URL

Local JWT Decoder

Decode a JWT's header and payload — no signature verification

Local CSS/JS Minifier

Strip comments and whitespace from CSS or JavaScript

Local HTML Formatter

Pretty-print and indent messy or minified HTML

Local HTML Minifier

Strip comments and whitespace from HTML to shrink page weight

Local JSON Minifier

Strip whitespace from JSON to shrink its size

Local UUID Generator

Generate random, standards-compliant UUIDs (v4)

Local XML Formatter

Pretty-print and indent messy or minified XML

Local XML Validator

Check whether XML is well-formed, with a clear error message

Local YAML Validator

Catch tabs, duplicate keys, and indentation mistakes in YAML

Local Barcode Generator

Generate a scannable Code 128 barcode from text

Local Hash Generator (MD5/SHA-256)

Generate MD5 and SHA-256 hashes from text

About Developer Tools

Convert between JSON, XML, YAML, and CSV; format, minify, and validate JSON/XML/HTML; diff two JSON files; and generate or decode the things developers deal with daily — Base64, JWTs, hashes, UUIDs, QR codes, and Unix timestamps.

Every tool in this category runs entirely client-side — nothing you paste or upload is sent anywhere, which matters when you're inspecting a JWT, a config file, or anything else you'd rather not paste into a random server.