ToolStack category
Developer Tools
JSON, Base64, JWT, UUID, regex and other developer utilities. Explore browser-based pages that are easy to use, easy to link internally, and built for quick tasks on desktop or mobile.
What you can do with these developer tools
This category brings together related ToolStack pages so you can move between similar utilities without repeating the same search. Each page includes SEO-friendly descriptions, structured headings, and related links to help users and search engines understand how the tools connect.
Developer Tools available on ToolStack
HTML Viewer Tool
Paste raw HTML or upload an HTML file to render a live preview in a sandboxed iframe.
JSON Viewer
View JSON in a searchable tree format to inspect nested objects, arrays, parent-child structure, and values more easily.
HAR File Analyzer & Comparator
Upload one or two HAR files to inspect slow requests, failed APIs, third-party dependencies, and network bottlenecks across environments.
JSON Validator
Validate JSON and detect syntax errors instantly.
Base64 Encoder Decoder
Encode text to Base64 or decode Base64 strings instantly.
URL Encoder Decoder
Encode or decode URLs for safe transmission.
UUID Generator
Generate random UUID v4 identifiers instantly.
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