DevToolbox
Free online developer tools that run entirely in your browser
No data ever leaves your device. No accounts, no uploads, no server processing. Just paste your data and get instant results.
Converters
Transform between formatsXML ↔ JSON Converter
Convert XML to JSON and JSON to XML instantly. Handles attributes, nested elements, CDATA, and namespaces.
📦YAML ↔ JSON Converter
Convert YAML to JSON and back. Essential for Kubernetes, Docker Compose, CI/CD configs.
📊CSV ↔ JSON Converter
Convert CSV spreadsheet data to JSON arrays and back. Handles headers, quoted fields, and delimiters.
⚙️TOML ↔ JSON Converter
Convert TOML config files to JSON. Works with Cargo.toml, pyproject.toml, and more.
📝Markdown → HTML
Convert Markdown to HTML with live preview. Supports GFM, code blocks, tables, and links.
Encoders & Decoders
Encode & decode dataBase64 Encode / Decode
Encode text to Base64 or decode Base64 back to text. Supports UTF-8 and binary content.
🔗URL Encode / Decode
Encode special characters for URLs or decode percent-encoded strings back to readable text.
🏷️HTML Entity Encode / Decode
Encode and decode HTML entities. Named, numeric, and full non-ASCII encoding modes.
Formatters & Validators
Beautify & validateUtilities
Inspect & convert valuesJWT Decoder
Decode and inspect JSON Web Tokens. View header, payload claims, and expiration status.
⏱️Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Live clock included.
🔢Number Base Converter
Convert between binary, octal, decimal, and hexadecimal with real-time updates.
Why DevToolbox?
100% Client-Side
Every tool runs entirely in your browser. Your data is never sent to any server, stored in any database, or logged by any analytics service. Safe for production data, API keys, and internal payloads.
Instant Results
No waiting for server responses. Conversions, formatting, and encoding happen in milliseconds using your device's processing power. Works offline once the page is loaded.
Built for Developers
Clean interfaces designed for real workflows. Each tool includes detailed documentation, edge case handling, and educational content to help you understand the formats you're working with.
Common Developer Workflows
API Integration & Debugging
Working with a SOAP API that returns XML? Convert the response to JSON to inspect the structure, then use the JSON Formatter to pretty-print nested payloads. When building REST endpoints that consume XML feeds, prototype your data mapping before writing production code.
Authentication & Token Inspection
Base64-decode JWT token payloads to inspect claims without installing external tools. Encode API credentials for Basic Authentication headers. Decode mysterious Base64 strings from configuration files or logs.
URL Construction & Query Parameters
Encode special characters for URL parameters, decode percent-encoded URLs from server logs, and validate that your query strings are properly escaped before making API calls.
Data Migration & ETL
Convert XML data feeds (RSS, ATOM, SOAP, XBRL) to JSON for ingestion into modern data pipelines. Validate and format JSON payloads before loading into MongoDB, Elasticsearch, or data warehouses.
Developer Guides
In-depth articles to help you understand the formats, conversion rules, and best practices behind each tool.
XML to JSON Conversion
Mapping rules, attribute handling, arrays, namespaces, and migration patterns.
JSON to XML Conversion
Root elements, SOAP envelopes, null handling, and validation strategies.
XML vs JSON Comparison
Side-by-side analysis with decision frameworks and industry patterns.
XML Basics Tutorial
Syntax, DTD, XSD, XPath, XSLT, and real-world XML usage.
JSON Complete Guide
Data types, parsing, JSON Schema, security, and performance.
Step-by-Step Guide
Walkthroughs, tips, and troubleshooting for the converter.
Frequently Asked Questions
Is my data private?
Yes. Every tool runs entirely in your browser using client-side JavaScript. No data is transmitted to our servers. Your input is discarded when you close the tab.
Do I need to create an account?
No. All tools are free and require no registration, no email, and no login. Open the page and start working.
Is there a size limit?
No hard limit. Since tools run in your browser, performance depends on your device. Most browsers handle inputs up to 10-15 MB without issues.
Can I use these tools offline?
Once the page is loaded, the tool functionality works without an internet connection. The page needs to be initially loaded online.
Built by JDApplications · Free developer tools that respect your privacy