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Practical guides for every tool on ProDevTools.xyz, plus answers to the questions developers ask most often. For longer technical writing, head to the blog.
How to beautify, minify, and inspect JSON data effectively during development and debugging.
Detect syntax errors, duplicate keys, and structural issues in JSON payloads with confidence.
Build production-ready box-shadow values with offset, blur, spread, and inset controls.
Encode and decode text using standard, URL-safe, and MIME variants of Base64.
ProDevTools.xyz is a collection of free, browser-based developer utilities. Each tool is built around a single, well-defined task: formatting JSON, validating syntax, generating CSS shadows, or encoding Base64. There is no sign-up, no installation, and no data transmission — every operation runs locally in your browser.
To get started, pick the tool you need from the navigation menu or the home page. Paste your input, choose the operation you want to perform, and copy the result. That is the entire workflow. The interface is designed to stay out of your way during long debugging sessions, with sensible defaults and minimal visual noise.
If you are new to web development, the blog contains in-depth articles that explain the underlying concepts (what JSON is, why Base64 exists, how CSS shadows work). The tool guides below assume basic familiarity with the relevant format.
The JSON Formatter beautifies minified JSON and minifies pretty-printed JSON. The common workflow is to paste a captured API response, hit "Beautify," and read the structure with proper indentation. For configuration files headed for production, the "Minify" mode strips whitespace to reduce payload size without changing semantics.
The formatter handles edge cases that catch naive implementations off guard: deeply nested objects, Unicode escape sequences, very long strings, and arrays containing thousands of elements. If a payload fails to parse, the error message reports the exact position so you can fix the syntax error in your source.
For longer reading, see the blog article JSON Formatting Best Practices for Modern Web Development.
The JSON Validator performs strict RFC 7159 and ECMA-404 validation. It reports byte-position errors, detects duplicate keys, and flags trailing commas. Use it whenever a payload is failing to parse and you need to know precisely where the problem is.
Validation is more than syntax checking. The article JSON Validation: From Syntax Checks to Schema Enforcement walks through the full layered approach: syntactic, structural, semantic, and cross-field validation, and where each layer belongs in a production pipeline.
The Shadow Generator visualises CSS box-shadow as you adjust the offset, blur, spread, color, and inset controls. The output panel exports both raw CSS and the closest matching Tailwind utility class, so you can drop the shadow straight into a component or design token file.
For a deeper treatment of layered shadows, dark-mode elevation, and performance considerations, read The Complete Guide to CSS box-shadow.
The Base64 Encoder/Decoder supports the three common variants: standard (RFC 4648 §4), URL-safe (RFC 4648 §5), and MIME (RFC 2045). Pick the variant that matches the channel your data will travel through — getting this wrong is one of the most common encoding bugs in production.
For a full explanation of how Base64 works, when to use it, and the mistakes to avoid, see Understanding Base64 Encoding: A Complete Developer Guide.
Each tool has a stable URL designed for bookmarking. Pin them in your browser's bookmark bar to skip the home page entirely when you are deep in a debugging session.
Open the browser's network panel before pasting data into any tool on the site. You will see no outbound requests containing your input. We encourage you to verify rather than trust.
Each tool has a matching long-form article on the blog. The tool gets the immediate task done; the article explains the concepts that make you better at choosing when to use it.
The tools rely on cached JavaScript after the first visit, so they continue to work on flaky networks or fully offline environments. Open the page once on a strong connection and you are set.
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