25 tools · 5 guides · 0 uploads · 0 sign-ups
Free online tools that run in your browser
Format JSON, test regular expressions, minify CSS, score email subject lines and more. Every tool on Utilities Hut runs entirely on your device — nothing you paste is ever sent to a server.
JSON Tools
12 toolsJSON Formatter
Beautify and pretty-print JSON with 2-space, 4-space, or tab indentation.
Open tool →JSON Validator
Check JSON syntax and get the exact line and column of any error.
Open tool →JSON Minifier
Compress JSON by removing whitespace. See exactly how many bytes you save.
Open tool →JSON to CSV Converter
Convert a JSON array of objects into a downloadable CSV file.
Open tool →CSV to JSON Converter
Turn CSV data into a JSON array of objects, with automatic type detection.
Open tool →JSON to YAML Converter
Convert JSON documents into clean, indented YAML.
Open tool →JSON to XML Converter
Convert JSON into well-formed, indented XML markup.
Open tool →JSON to TypeScript
Generate TypeScript interfaces automatically from a JSON sample.
Open tool →JSON Sorter
Sort all object keys alphabetically for stable, diff-friendly JSON.
Open tool →JSON Escape / Unescape
Escape text for use inside JSON strings, or unescape it back.
Open tool →JSON Diff
Compare two JSON documents and list every added, removed or changed value.
Open tool →JSON Viewer
Explore JSON in a collapsible tree view with type highlighting.
Open tool →Encoders & Converters
4 toolsBase64 Encode / Decode
Encode text to Base64 or decode Base64 back to text. Full UTF-8 support.
Open tool →URL Encoder / Decoder
Percent-encode URLs and query strings, or decode them back to plain text.
Open tool →Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and back.
Open tool →Text to Binary Converter
Convert text to binary (and binary back to text) instantly.
Open tool →CSS & Color Tools
3 toolsText & Writing Tools
2 toolsEmail Tools
3 toolsEmail Subject Line Tester
Score your subject line for length, spam triggers and open-rate best practices.
Open tool →Email Spam Checker
Scan your email copy for spam trigger words before you hit send.
Open tool →Email Signature Generator
Create a clean HTML email signature that works in Gmail and Outlook.
Open tool →Developer Tools
1 toolGuides
5 articlesWhat Is JSON? A Plain-English Guide
What JSON is, what it looks like, and why every API speaks it.
Read guide →How to Fix Common JSON Errors
Trailing commas, single quotes, unexpected tokens — and how to fix each one.
Read guide →JSON vs XML vs YAML
The same data in all three formats, and how to choose between them.
Read guide →How to Open a JSON File
Every way to open, view and edit .json files on any device.
Read guide →JSON Best Practices
Naming, structure, dates, numbers and nulls — conventions that save pain later.
Read guide →Why these tools are different
Most online utility sites send your data to a server to process it. Everything on Utilities Hut is built as a client-side web app: the formatting, encoding, testing and converting all happen in JavaScript inside your own browser tab. That makes each tool instant to use, safe for sensitive data like API responses or email drafts, and available even on a flaky connection once the page has loaded.
The collection covers the small jobs developers, marketers and writers hit every day: cleaning up a minified JSON payload, checking whether a regex actually matches, converting a Unix timestamp from a log file, or sanity-checking an email subject line before a send. The JSON section runs deepest — twelve tools from formatting to diffing to TypeScript generation, backed by five in-depth guides — and more categories will grow the same way over time.