UtilsNest

UtilsNest

Smart tools, no clutter

Developer Tools

Free Online Developer Tools

The developer utilities you reach for every week — JSON formatting, Base64, JWT decoding, hash generation, regex testing, and more. All free, all browser-based, nothing uploaded.

JSON Formatter

Beautify, minify, and validate JSON.

Base64 Encoder / Decoder

Encode and decode Base64 strings and files.

Regex Tester

Test regex patterns with live match highlighting.

JWT Decoder

Decode JWT headers and payloads client-side.

URL Encoder / Decoder

Encode and decode URL components and query strings.

Unix Timestamp Converter

Convert Unix epoch to readable date and back.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes.

Binary Converter

Convert between binary, decimal, hex, and octal.

JSON to CSV

Convert JSON arrays to CSV files.

CSV to JSON

Convert CSV data into JSON arrays.

XML Formatter

Beautify, minify, and validate XML.

YAML to JSON

Convert YAML config files to JSON.

Cron Expression Parser

Explain cron schedules in plain English.

Regex Escaper

Escape special regex characters in a string.

HTML Entity Encoder

Encode and decode HTML entities.

HTML Tag Remover

Strip all HTML tags from any text.

HTML/JS Minifier & Beautifier

Minify or beautify HTML and JavaScript code.

Binary Text Converter

Convert text to binary and decode binary to text.

Color Converter

Convert HEX, RGB, HSL, HSV, and CMYK colors.

UUID Generator

Generate UUID v4 and v1 identifiers.

IP Address Lookup

Find location, ISP, and country for any IP.

User-Agent Parser

Detect browser, OS, and device from UA strings.

HTTP Status Code Checker

Check HTTP response codes for any URL.

Why Use Browser-Based Developer Tools?

Browser-based developer tools protect your data — JSON payloads with API keys, JWTs with user claims, and private configuration files never leave your device. UtilsNest runs every operation in JavaScript client-side.

Most Used Developer Tools

  • JSON Formatter — quickly validate and beautify API responses before debugging.
  • JWT Decoder — inspect token claims, expiry, and issuer without a server.
  • Hash Generator — generate SHA-256 checksums for file integrity verification.
  • Base64 Encoder/Decoder — encode images for data URIs or decode Base64 API strings.
  • Regex Tester — debug complex patterns with live match highlighting and group capture view.
  • Unix Timestamp Converter — quickly convert epoch values in log files to human-readable dates.

Frequently Asked Questions

Is my JSON or code sent to a server?
No. All processing runs in your browser. Nothing is transmitted, logged, or stored.
Do these tools work offline?
Once the page loads, most tools work without an internet connection since all logic is client-side JavaScript.