Developer Tools & Code Utilities
High-speed, client-side developer utilities designed for software engineers, frontend creators, and web architects. Format JSON, decode JWT tokens, generate hashes, build Cron schedules, and generate modern CSS.
JSON, XML & Data Formatters
18 ToolsFormat, validate, beautify, escape, parse, and convert JSON, XML, TOML, and CSV data structures with sub-second performance.
JSON Schema Builder for LLM Structured Outputs
Visually build JSON Schemas for OpenAI Function Calling, Claude Tool Use, and structured JSON outputs with type constraints, nested objects, and live JSON schema export.
JSONL Validator for AI Fine-Tuning Datasets
Validate JSONL (JSON Lines) datasets for OpenAI, Anthropic, and HuggingFace fine-tuning. Detect syntax errors per line, verify role balance (system/user/assistant), and calculate dataset token metrics.
JSON Escape & Unescape Tool
Escape and unescape JSON string content. Automatically handle double quotes, newlines, tabs, backslashes, and unicode escape sequences.
JSON Validator & Syntax Error Pinpointer
Validate JSON data with exact line and column error markers, detailed syntax problem explanations, and automated one-click syntax repair.
XML Formatter, Beautifier & Minifier
Format, beautify, indent, and minify XML code with customizable indentation (2 spaces, 4 spaces, tabs), self-closing tag handling, and syntax validation.
JSON to CSV Converter & Table Exporter
Convert JSON arrays and nested JSON objects into clean CSV or TSV spreadsheets with automatic column detection and nested key flattening.
XML to JSON & JSON to XML Converter
Convert XML data to JSON format and JSON back to XML with attribute preservation, array mapping, and CDATA support.
TOML to JSON & JSON to TOML Converter
Convert TOML configuration files to JSON and JSON back to valid TOML with support for tables, inline tables, datetime strings, and nested arrays.
JSONPath Tester & Query Evaluator
Query and extract nested fields from JSON using JSONPath expressions ($..book[?(@.price<10)]) with real-time match evaluation and path highlights.
YAML Validator & Syntax Checker
Validate YAML files, detect indentation and syntax errors with line numbers, and convert validated YAML to JSON in real-time.
YAML to Go Struct Converter
Generate strongly-typed Go (Golang) struct definitions from YAML configuration data with yaml and json struct tags and nested type inference.
JSON to Go Struct Converter
Convert JSON payloads into idiomatic Go (Golang) structs with type inference (string, int, float64, slice, pointer), json struct tags, and inline comments.
JSON Formatter
Format, minify, validate, and clean JSON data strings with clear, real-time syntax checking and errors.
JSON Beautifier
Beautify, format, sort keys, and prettify nested JSON data with custom indentation and color syntax highlighting.
CSV to JSON Converter
Convert CSV spreadsheets and tabular data into formatted JSON arrays or objects with custom delimiter detection.
JSON Parser (String to JSON)
Parse, validate, and unescape stringified JSON strings into structured, inspectable JSON data with syntax checking.
JSON to TypeScript & Zod Schema Generator
Convert JSON into TypeScript interfaces, type definitions, and Zod validation schemas instantly with nested object resolution.
YAML ⇄ JSON Bidirectional Converter
Convert between YAML and JSON in real time with syntax error validation, formatted tree indentation, and 1-click copy.
Cryptography & Security Suite
15 ToolsDecode and sign JWT tokens, AES encryption, Bcrypt passwords, HMAC signatures, CSPRNG tokens, and calculate hashes with zero server logs.
LLM Token Counter & Tokenizer Visualizer
Count and visualize tokens across OpenAI GPT-4o, Anthropic Claude 3.5 Sonnet, Google Gemini 2.0/1.5, and Meta Llama 3 with color-coded token chips and reading time metrics.
Encrypted Ephemeral File Share & P2P Drop
Share files privately and securely using in-browser Web Crypto AES-GCM encryption with password protection and local ephemeral download links. Zero files stored on remote servers.
Secure Random Token & API Key Generator
Generate cryptographically secure random API keys, bearer tokens, Nanoids, URL-safe Base64 strings, and hexadecimal secrets using the Web Crypto API.
HMAC Signature Generator (SHA-1 to SHA-512)
Generate Keyed-Hash Message Authentication Code (HMAC) signatures with SHA-1, SHA-256, SHA-384, and SHA-512 algorithms directly in your browser.
AES Text Encryption & Decryption (AES-GCM/CBC)
Encrypt and decrypt text messages and secrets using industry-standard AES-GCM and AES-CBC 256-bit encryption with PBKDF2 password key derivation.
JWT Token Generator & Signer (HS256)
Create, configure, and sign JSON Web Tokens (JWT) with custom headers, expiration times, audience, issuer, subject, and HMAC-SHA256 secret keys.
Bcrypt Hash Generator & Password Verifier
Generate secure Bcrypt password hashes with configurable work cost factors (4-14) and verify plain-text passwords against existing Bcrypt hashes in real-time.
Image to Base64 & Data URI Converter
Turn images into Base64 encoded Data URIs (data:image/png;base64,...) and decode Base64 strings back to downloadable image files with instant preview.
File Hash & Checksum Generator
Generate cryptographic SHA-256, SHA-512, SHA-384, SHA-1, and MD5 checksums for files and text strings online. Includes instant checksum verification and match comparison with 100% in-browser privacy.
Base64 to Image Converter
Decode Base64 strings and Data URIs into downloadable PNG, JPG, SVG, WebP images, PDF documents, and binary files. Includes instant preview, magic-byte MIME detection, and 100% in-browser privacy.
Password Generator
Create highly secure, customizable passwords instantly with custom lengths and character sets.
Base64 Encoder / Decoder
Encode your plain text into standard Base64 encoding formats or securely decode existing Base64 strings.
File Checksum & HMAC Hash Calculator
Compute SHA-256, SHA-512, MD5, and HMAC hashes of text and multi-gigabyte files using native Web Crypto streaming.
JWT Decoder
Decode and inspect Header, Payload, and Signature details of JSON Web Tokens offline.
Hash Generator (MD5, SHA, Base64)
Generate MD5, SHA-1, SHA-256, SHA-512, and Base64 cryptographic hashes instantly in your browser.
Binary, Hex & Number Systems
11 ToolsConvert between Binary, Hexadecimal, Decimal, and Octal with step-by-step bit calculations, bitwise math, and ASCII tables.
Binary to Decimal Converter
Convert binary numbers (Base-2) to decimal (Base-10) with step-by-step bit weight calculations (2^n powers), signed two's complement, and bit breakdowns.
Decimal to Binary Converter
Convert decimal integers (Base-10) to binary numbers (Base-2) with division-by-2 steps, 8/16/32/64-bit padding, and two's complement negative number support.
Hexadecimal to Decimal Converter
Convert hexadecimal numbers (Base-16) to decimal (Base-10) with positional power-of-16 expansion, signed/unsigned interpretation, and byte breakdown.
Decimal to Hexadecimal Converter
Convert decimal numbers (Base-10) to hexadecimal (Base-16) with prefix options (0x, #, raw), fixed byte width formatting, and division-by-16 work steps.
Binary to Text Converter (ASCII / UTF-8)
Decode binary byte streams (8-bit binary numbers) into human-readable text characters across ASCII and UTF-8 encodings with space/comma delimiter handling.
Text to Binary Converter
Encode plain text strings into 8-bit binary byte representations with space-separated, comma-separated, or continuous formatting.
Hex to Binary Converter
Convert hexadecimal strings and numbers directly into 4-bit binary nibbles and formatted binary strings.
Octal to Decimal Converter
Convert octal numbers (Base-8) to decimal numbers (Base-10) with step-by-step 8^n power calculations and octal character explanations.
Binary Math & Bitwise Calculator
Perform binary arithmetic (Addition, Subtraction, Multiplication, Division) and bitwise operations (AND, OR, XOR, NOT, Bit-Shift) with real-time base conversions.
ASCII Table & Character Code Reference
Interactive searchable ASCII table showing Decimal, Hexadecimal, Octal, Binary, Symbol, HTML entity, and descriptions for all 128 standard and extended ASCII characters.
Binary & Numeral Systems Converter
Convert numbers between Binary, Decimal, Hexadecimal, Octal, and ASCII text in real time with bit breakdown.
Web, Network & HTTP Tools
11 ToolsInspect HAR archives, parse URLs and cookies, test WebRTC ICE/leaks, calculate CIDR subnet ranges, and inspect HTTP status codes.
Gzip, Deflate & Raw Compression Comparison
Compare file compression sizes, compression ratios, and byte savings across Gzip, Deflate, and uncompressed formats directly in your browser using CompressionStream API.
HAR File Viewer & Waterfall Analyzer
Inspect and analyze HTTP Archive (.har) files with request timelines, HTTP status code distribution, MIME type breakdown, headers, and waterfall timings.
URL Parser & Query String Analyzer
Break down complex URLs into protocol, origin, host, port, path, individual query parameters table, and hash fragments with interactive URL reconstruction.
HTTP Cookie Parser & Set-Cookie Header Inspector
Inspect cookie strings and Set-Cookie HTTP headers. Parse Name, Value, Domain, Path, Expires, Max-Age, SameSite, Secure, and HttpOnly attributes into structured tables.
CIDR Calculator & Subnet Address Range Expander
Calculate IP address ranges, network address, broadcast address, netmask, wildcard mask, and total usable hosts from CIDR notation (e.g., /24, /16).
WebRTC ICE Candidate Test & STUN/TURN Tester
Test STUN and TURN server connectivity in real-time, gather host, srflx, and relay ICE candidates, and measure network connection latency and protocol types.
WebRTC IP Leak Test (VPN Privacy Check)
Check if WebRTC leaks your true public IP or local LAN IP address behind a VPN or proxy tunnel directly within your web browser.
HTTP Status Codes Directory & Guide
Complete directory of all HTTP response status codes (1xx, 2xx, 3xx, 4xx, 5xx) with RFC definitions, standard use cases, common causes, and debugging tips.
cURL to Fetch, Axios & Python Converter
Convert cURL commands into JavaScript fetch, Axios, Python Requests, Go HTTP, and PHP code snippets in real time.
IPv4 Subnet & CIDR IP Range Calculator
Calculate usable host ranges, broadcast IP, subnet masks, wildcard masks, and binary address breakdown for any CIDR network.
URL Encoder / Decoder
Encode strings into URI components or decode percent-encoded URLs instantly client-side.
Frontend, CSS & Vector Tools
22 ToolsGenerate CSS gradients, OKLCH colors, box shadows, border radii, convert bitmap images to vector SVGs, and format HTML/JS.
RGB to HEX Color Converter
Convert RGB (Red, Green, Blue) color values to standard 6-digit Hexadecimal format with real-time swatch preview, CSS snippets, and color metrics.
RGBA to HEX Color Converter (8-Digit Alpha)
Convert RGBA color values with alpha transparency channels into 8-digit (#RRGGBBAA) and 6-digit Hex codes with opacity percentages.
HEX to RGB Color Converter
Convert hexadecimal color codes (#RGB and #RRGGBB) to standard rgb(r, g, b) notation, decimal ratios (0-1), and individual color channels.
HEX to RGBA Color Converter
Convert Hex color codes to CSS rgba() format with interactive alpha opacity slider, CSS variable generation, and dark/light mode contrast preview.
HEX to OKLCH Color Converter
Convert Hex color codes to modern CSS Color Module 4 OKLCH color space (Lightness, Chroma, Hue) with P3 wide-gamut compatibility check.
Hexadecimal to Decimal Converter
Convert hexadecimal numbers (Base-16) to decimal (Base-10) with positional power-of-16 expansion, signed/unsigned interpretation, and byte breakdown.
Hex to Binary Converter
Convert hexadecimal strings and numbers directly into 4-bit binary nibbles and formatted binary strings.
Image Color Picker & Palette Extractor
Pick colors from any image with a pixel magnification loupe and extract 8 dominant color palette swatches with HEX, RGB, and HSL copy formats.
CSS Triangle & Corner Ribbon Generator
Generate pure CSS border triangles, directional arrows, and corner sale ribbon badges without needing image assets.
SVG Wave & Organic Liquid Blob Studio
Generate customizable SVG footer wave dividers and fluid organic blobs with multi-layer colors, randomizer, and SVG/PNG download.
PNG to SVG Converter
Convert PNG images to scalable SVG vector graphics instantly. Free online PNG to SVG converter with tracing controls — no upload, no login.
JPG to SVG Converter
Convert JPG and JPEG images to SVG vector format online. Free JPG to SVG converter with threshold, color mode, and smoothness controls.
SVG to PNG Converter
Convert SVG vector files to high-resolution PNG images online. Set custom width, height, scale factor, and background color — free, no login.
SVG to JPG Converter
Convert SVG vector files to JPG images online. Adjust JPEG quality, background color, and resolution — free SVG to JPG converter, no login required.
Online SVG Editor
Edit, preview, prettify, and minify SVG code online. Free SVG editor with live side-by-side preview, upload, and instant download — no login needed.
SVG to PDF Converter
Convert SVG files to PDF documents online, free. Choose page size (A4, A3, Letter) and orientation. 100% client-side SVG to PDF conversion.
CSS Minifier & Beautifier
Compress, minify, prettify, and format CSS code online with autoprefixer and syntax validation.
CSS Box Shadow Generator
Visual CSS Box Shadow generator with multi-layer shadows, spread, blur, inset, and live CSS code export.
CSS Border Radius Generator
Create custom organic blob shapes and CSS border-radius curves with interactive preview controls.
CSS Color & Gradient Master Suite
All-in-one CSS color toolkit: linear & radial gradients, color code picker (HEX/RGB/HSL/OKLCH), harmonies, palettes, 148 CSS color names, SVG color filters, and text effects.
Image Color Extractor & All Color Codes Scanner
Upload or paste any image (Ctrl+V) to extract all possible color codes (HEX, RGB, HSL, OKLCH, CMYK, CSS Names), inspect with 15x pixel loupe, sort frequencies, and export palettes.
Color Code Converter (HEX, RGB, HSL, CMYK)
Convert colors between HEX, RGB, HSL, HSV, and CMYK formats with real-time visual color preview.
DevOps, Git & Automation
10 ToolsBuild .gitignore templates, generate Apache .htaccess rules, explain AWS IAM policies, build Cron schedules, and convert cURL to code.
Meta Tag Generator (SEO, Open Graph & Twitter)
Generate complete HTML meta tags for Google SEO, Open Graph (Facebook/LinkedIn), and Twitter Cards with real-time SERP and social card previews.
Gitignore File Generator (100+ Templates)
Build comprehensive, clean .gitignore files by selecting languages, frameworks, operating systems, and IDE templates (Node, Python, Rust, VSCode, macOS, Windows).
Apache .htaccess Generator & Redirect Rules Builder
Generate Apache .htaccess configuration files for 301 redirects, HTTPS enforcement, WWW/non-WWW canonicalization, browser caching, Gzip compression, and custom error pages.
Meta Tag Previewer & Social Link Card Tester
Preview how your web page appears on Google Search results, Twitter / X summary and large image cards, Facebook, LinkedIn, and Discord link previews.
AWS IAM Policy Explainer (Plain English)
Parse and translate complex AWS IAM JSON policies and role trust policies into clear, plain-English security summaries with wildcard risk alerts and least-privilege analysis.
cURL to Fetch, Axios & Python Converter
Convert cURL commands into JavaScript fetch, Axios, Python Requests, Go HTTP, and PHP code snippets in real time.
Chmod Linux Permissions Matrix & Octal Calculator
Calculate Linux file permissions with an interactive Read/Write/Execute (rwx) matrix and generate chmod 755/644 commands.
Cron Generator
Generate cron job expressions, translate them to human description, and preview next execution dates.
Meta Tags & Heading Extractor
Analyze HTML source or URLs to extract title, meta description, Open Graph tags, and heading structure.
Mesh to Micron Sieve Size Converter
Convert particle filter sieve sizes between US Mesh count, Microns (µm), Millimeters (mm), and Inches.
Frequently Asked Questions
?Are Nextgen Astra developer tools free to use?
Yes! All developer tools, JSON formatters, JWT decoders, and security utilities on Nextgen Astra are 100% free with no limits, accounts, or watermarks.
?Are my JSON payloads, JWT tokens, and passwords secure?
Yes, absolutely. All formatting, decoding, cryptographic hashing (SHA-256/MD5), and password generation run 100% locally in your browser sandbox using the native Web Crypto API. No data is ever transmitted over the network.
?Can I use these developer tools offline?
Yes! Because the tools run purely client-side with JavaScript and WebAssembly, once the page is loaded, you can format JSON, decode JWTs, and generate hashes even without an active internet connection.