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DevFlow — Free Online Developer Tools
80 specialized utilities for developers. All free, all running in your browser.
Accessibility Checker
— Scan HTML for WCAG accessibility issues with AI-powered fix suggestions.
Bundle Size Analyzer
— Analyze and visualize JavaScript bundle sizes with optimization suggestions.
JSON Formatter
— Prettify, minify, and validate JSON data instantly.
JSON Repair Tool
— Repair and fix malformed JSON data from AI outputs and copy-paste.
Base64 Encode/Decode
— Encode and decode Base64 strings, files, and data URIs instantly.
URL Encoder/Decoder
— Encode, decode, and parse URLs and query strings instantly.
SQL Formatter
— Format, minify, and validate SQL queries with dialect support.
Text Diff Checker
— Compare two text blocks and highlight exactly what changed.
Git Conflict Resolver
— Visually resolve Git merge conflicts by picking current, incoming, or both versions.
Text Case Converter
— Convert text between 20+ case formats: camelCase, snake_case, kebab-case, Title Case, and more.
JWT Decoder
— Decode, inspect, and validate JWT tokens with claim analysis.
Hash Generator
— Generate and verify cryptographic hashes with multiple algorithms.
UUID Generator
— Generate, validate, and decode UUIDs, ULIDs, and Nano IDs instantly.
Cron Parser
— Parse, validate, and build cron expressions with human-readable explanations.
SVG Optimizer
— Optimize, minify, and clean SVG files with configurable SVGO presets.
Regex Tester
— Test, debug, and explain regular expressions with real-time match highlighting.
Regex Explainer
— Break down any regex into plain English, token by token.
Password Generator
— Generate secure passwords, passphrases, and PINs with strength analysis.
CSP Builder & Validator
— Build and validate Content Security Policy headers with security scoring.
Timestamp Converter
— Convert between Unix timestamps, ISO 8601, and human-readable dates instantly.
Color Converter
— Convert colors between HEX, RGB, HSL, oklch, CMYK, and 16+ formats instantly.
Markdown Preview
— Preview and render Markdown with GFM, math, Mermaid diagrams, and export options.
HTML Formatter
— Format, minify, and validate HTML with attribute sorting and template support.
CSS Formatter
— Format, minify, and validate CSS with sorting and SCSS conversion.
YAML Converter
— Convert between JSON and YAML with validation, formatting, and multi-document support.
CSV to JSON
— Convert CSV/TSV to JSON and JSON to CSV with type inference and multiple output formats.
QR Code Generator
— Generate QR codes for URLs, Wi-Fi, contacts, events, and more with custom styles.
Lorem Ipsum Generator
— Generate placeholder text in multiple formats and styles instantly.
Favicon Generator
— Generate favicons for all platforms from any image, text, or emoji.
Mock Data Generator
— Generate realistic fake JSON data from schemas, field templates, or sample data for testing and prototyping.
JSON to TypeScript & Schema Generator
— Generate TypeScript interfaces, Zod schemas, and Valibot schemas from JSON.
cURL to Code Converter
— Convert cURL commands to code in 12+ programming languages instantly.
HTML to Markdown
— Convert HTML to Markdown with support for GFM, CommonMark, and Obsidian syntax.
HTML Entities Encoder/Decoder
— Encode and decode HTML entities with named, numeric, and hex modes.
IP Lookup
— Look up geolocation, network, and security details for any IP address.
DNS Lookup
— Look up DNS records for any domain — A, AAAA, MX, TXT, NS, SOA, SRV, CAA, and more.
Image Compressor
— Compress and optimize images to reduce file size without noticeable quality loss.
XML Formatter
— Format, minify, validate, and convert XML to JSON.
AI Token Counter
— Count tokens and estimate API costs for major LLMs instantly.
AI Prompt Builder
— Build structured LLM prompts with per-section token counting, variable injection, and provider-aware exports for OpenAI, Anthropic, and Google.
Number Base Converter
— Convert numbers between binary, octal, decimal, hexadecimal and custom bases.
JSON Path Tester
— Query and extract data from JSON documents using JSONPath.
HTTP Headers Analyzer
— Analyze HTTP response headers for security, caching, and compliance issues.
API Request Builder
— Build and test HTTP API requests with headers, body, auth, and response visualization.
HAR Analyzer & Request Replay
— Analyze HAR files, inspect slow/failed requests, generate replayable curl/fetch code.
OpenAPI Validator
— Validate, format, and summarize OpenAPI/Swagger specifications.
Env File Parser & Converter
— Parse, validate, and convert .env files between formats.
JS Minifier / Beautifier
— Format, minify, and validate JavaScript code instantly.
Stack Trace Analyzer
— Parse and analyze stack traces with AI-powered error explanations.
Tech Stack Detector
— Detect frameworks, libraries, and technologies used by any website.
Source Map Explorer
— Resolve minified stack traces back to original source code using source maps.
GraphQL Query Builder
— Build and test GraphQL queries with schema introspection and AI suggestions.
Responsive Design Tester
— Preview web pages across multiple device viewports instantly.
CSS Selector Tester
— Test CSS selectors against HTML with real-time matching and specificity analysis.
CSS Animation Generator
— Generate CSS keyframe animations with visual preview and easing functions.
Prompt Injection & Secret Scanner
— Scan prompts, code, and text for prompt injection patterns, secret leaks, unsafe instructions, and PII exposure.
PWA Manifest & Service Worker Audit
— Validate manifest.json, inspect service worker config, and flag installability issues.
MCP Schema Validator
— Validate, format, and debug MCP (Model Context Protocol) server schemas.
GitHub Actions Validator
— Validate, format and summarize GitHub Actions workflow YAML files against official schemas.
JSON to Dart
— Convert JSON to Dart classes with null-safety and json_serializable support.
JSON to Go Struct
— Convert JSON to Go structs with json tags and idiomatic naming.
JSON to TypeScript
— Convert JSON to TypeScript interfaces or type aliases instantly.
JSON to Zod Schema
— Convert JSON to Zod schema definitions for runtime validation.
JSON to Rust Struct
— Convert JSON to Rust structs with serde Serialize/Deserialize derive macros.
JSON to C# Class
— Convert JSON to C# classes with System.Text.Json or Newtonsoft serialization.
JSON to Pydantic Model
— Convert JSON to Pydantic v2 BaseModel classes for Python and FastAPI.
JSONL Converter
— Convert between JSONL (JSON Lines) and JSON arrays. Auto-detects direction.
TOML Converter
— Convert between TOML and JSON. Auto-detects direction from input format.
JSON to SQL Converter
— Convert JSON arrays to SQL CREATE TABLE and INSERT statements.
JSON to Protobuf Schema Generator
— Generate Protocol Buffer (.proto) schema definitions from JSON objects.
OpenAPI to Postman Collection Converter
— Convert OpenAPI/Swagger specs to Postman Collection v2.1 JSON.
Postman to OpenAPI Converter
— Convert Postman Collection v2.1 JSON to OpenAPI 3.0.0 specification.
HAR to Postman Collection Converter
— Convert HAR files to Postman Collection v2.1 JSON for API testing.
Webhook Tester
— Generate a unique URL, capture webhook requests, inspect headers & body, and replay them.
GraphQL Schema to TypeScript Generator
— Generate TypeScript types from GraphQL SDL schema definitions.
JSON to .env Converter
— Convert JSON configuration objects to .env files, Docker env, or Kubernetes ConfigMaps.
Docker Compose to Kubernetes
— Convert docker-compose.yml to Kubernetes Deployment, Service, ConfigMap, and PVC manifests.
Protobuf Inspector
— Parse and inspect Protocol Buffer .proto files — view message structures, field types, enums, and services.
JSON to Parquet Converter
— Convert JSON arrays to Apache Parquet columnar format using DuckDB WASM, right in your browser.
Kubernetes YAML Validator
— Validate, lint, and format Kubernetes manifests against structure rules, deprecated APIs, and security best practices.
DevFlow