Developer Utilities
All tools in this category process files 100% inside your web browser. Fast, private, and 100% free forever on NexVaani.
JSON Formatter & Validator
Format, validate, beautify, and inspect JSON data with syntax highlighting and tree view.
JSON Validator
Validate JSON syntax in real-time with line-by-line error messages and structure verification.
CSV to JSON Converter
Convert CSV spreadsheets and Excel data into formatted JSON arrays and nested objects offline.
Base64 Encoder & Decoder
Encode UTF-8 strings to Base64 or decode Base64 data into clean text with browser-based local processing.
Hash Generator (SHA-256, MD5)
Generate cryptographic hashes (SHA-256, SHA-512, SHA-1, MD5) directly inside your browser.
JWT Token Decoder
Decode and inspect JSON Web Tokens (JWT) headers, payloads, and claims offline in your browser.
JSON to CSV Converter
Convert JSON arrays and nested objects into tabular CSV spreadsheet files for Excel and Google Sheets.
UUID / GUID Generator
Generate cryptographically random RFC 4122 Version 4 UUIDs and GUIDs individually or in bulk.
Text & Code Diff Checker
Compare two text snippets or code files side-by-side to highlight additions, deletions, and character modifications.
Regular Expression Tester
Test and debug JavaScript regular expressions in real time with syntax highlighting and match capture groups.
Color Picker & Palette Generator
Inspect, convert, and harmonize colors across HEX, RGB, HSL, and CMYK formats with WCAG contrast checker.
HTML Minifier & Beautifier
Minify HTML markup by removing whitespace, comments, and line breaks to accelerate web page loading.
CSS Minifier
Minify CSS code by stripping whitespace, comments, and redundant semicolons to boost page speed.
JavaScript Minifier
Minify and compress JavaScript source code in your browser to reduce script payload sizes.
QR Code Scanner & Reader
Scan and decode QR codes instantly using your device webcam or by uploading image files.
Secure Password Generator
Generate strong, high-entropy cryptographic passwords with custom length, symbols, and numbers locally using Web Crypto API.
My IP Address Checker
Check your public IPv4/IPv6 address, ISP, location, and browser connection details instantly.
Number Base Converter
Convert numbers across Binary (Base 2), Octal (Base 8), Decimal (Base 10), and Hexadecimal (Base 16).
HTML Entity Encoder & Decoder
Encode special characters into HTML entities and decode HTML entities back to raw text.
URL Encoder & Decoder
Encode strings into percent-encoded URL formats (encodeURIComponent) and decode percent-encoded URLs.
Barcode & QR Studio
Generate Code 128 retail barcodes and 2D QR matrix codes with custom SKUs and high-resolution PNG export.
Digital Signature Generator
Draw digital signatures or generate stylish cursive calligraphy with transparent PNG download for PDFs and contracts.
JSON to CSV & CSV to JSON Converter
Convert JSON arrays to tabular CSV spreadsheets and CSV files back to JSON with syntax validation and instant download.