LocalDevToolbox

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🔄 cURL Converter

Parses cURL commands and converts them to Python (requests), JavaScript (fetch), Node.js (axios), Go, PHP, Ruby, Rust, or C# code. Also supports reverse conversion from code back to cURL. Uses a custom tokenizer to handle quoted strings, flags, headers, form data, and multipart uploads.

📋 JSON Formatter

Validates and pretty-prints JSON with syntax highlighting and collapsible tree view. Uses native JSON.parse() for validation. Supports minification and path-based node toggling.

🔐 JWT Decoder

Splits JSON Web Tokens into Header, Payload, and Signature components using Base64URL decoding. Displays claims like exp, iat, iss with expiration status. No signature verification (no secret key required).

🔤 Base64 Encode / Decode

Uses browser-native btoa() and atob() with UTF-8 safe encoding via encodeURIComponent. Handles text, URLs, and binary-safe operations in both directions.

🔗 URL Encode / Decode

Wraps encodeURIComponent() and decodeURIComponent(). Essential for preparing query strings, form data, and API parameters. Handles special characters, spaces, and Unicode.

🔍 Regex Tester

Compiles JavaScript RegExp objects with configurable flags (g, i, m, s). Shows all matches, capture groups, and positions in real-time. Useful for email validation, log parsing, and pattern extraction.

⏱️ Timestamp Converter

Converts between Unix epoch timestamps (seconds or milliseconds) and human-readable ISO/local dates. Uses native Date object. Includes "Use now" button for instant current timestamp.

#️⃣ Hash Generator

Generates SHA-256, SHA-512, and SHA-1 hashes using the Web Crypto API (crypto.subtle.digest). Useful for verifying file integrity, password hashing comparisons, and checksum generation.

📝 HTML Entity Encoder

Encodes special characters to HTML entities and decodes them back. Uses a temporary DOM textarea for accurate entity mapping. Essential for XSS prevention and HTML content generation.

📊 CSV ↔ JSON

Converts comma-separated values to JSON arrays and vice versa. Handles header rows, simple escaping, and basic nested structures. Useful for data migration, spreadsheet exports, and API payload preparation.

🏷️ Type Generator

Infers type definitions from JSON objects and generates TypeScript interfaces, Go structs, or Python classes. Recursively analyzes nested objects and arrays. Perfect for API integration when you only have sample responses.

🛠️ API Request Builder

Visual form for constructing cURL commands with method, URL, headers, body, and authentication. Outputs raw cURL that can be fed directly into the cURL Converter. Supports Basic Auth and Bearer tokens.

📑 Diff Checker

Compares two text blocks using a line-based LCS (Longest Common Subsequence) algorithm. Highlights additions, deletions, and inline character changes. Ideal for comparing API responses, config files, or code snippets.

🌐 URL Parser

Decomposes any URL into protocol, host, port, pathname, query parameters, and hash using the native URL constructor. Displays query params as a clean key-value list.

🎲 Mock Data Generator

Generates realistic fake JSON data for API testing. Includes templates for Users, Products, Orders, Blog Posts, Companies, and Employees. Supports custom field definitions. All data is generated locally using Math.random() — no external APIs called.