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DevFlow — Free Online Developer Tools

95 specialized utilities for developers. All free, all running in your browser.

Text & Data Tools

JSON Formatter — Prettify, minify, and validate JSON data instantly.
JSON Repair Tool — Repair and fix malformed JSON data from AI outputs, API responses, and copy-paste.
Base64 Encode/Decode — Encode and decode Base64 strings, files, and data URIs instantly.
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.
Markdown Preview — Preview and render Markdown with GFM, math, Mermaid diagrams, and export options.
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.
JSONL Converter — Convert between JSONL (JSON Lines / NDJSON) and standard JSON arrays with auto-detection.
TOML Converter — Convert between TOML and JSON formats with syntax validation, key sorting, and auto-direction detection.

Developer Tools Tools

JWT Decoder — Decode, inspect, and validate JWT tokens with claim and signature analysis.
Cron Parser — Parse, validate, explain, and build cron expressions with next run times and visual timeline.
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.
JSON to TypeScript & Schema Generator — Generate TypeScript interfaces, Zod schemas, and Valibot schemas from JSON.
AI Token Counter — Count tokens and estimate API costs for 100+ LLMs with exact BPE and provider tokenization.
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.
Env File Parser & Converter — Parse, validate, and convert .env files between JSON, YAML, Docker, and Kubernetes formats.
Stack Trace Analyzer — Parse, format, and analyze error stack traces with root cause isolation.
Tech Stack Detector — Detect frameworks, CMS platforms, analytics, and server 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.
Prompt Injection & Secret Scanner — Scan prompts, code, and text for prompt injection patterns, secret leaks, unsafe instructions, and PII exposure.
MCP Schema Validator — Validate, format, test, and debug Model Context Protocol (MCP) server schemas and tool definitions.
JSON to Dart — Convert JSON to null-safe Dart classes with json_serializable & fromJson constructors.
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 with automatic TypeScript type inference.
JSON to Rust Struct — Convert JSON into idiomatic Rust structs with Serde Serialize and 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 and JSON Schema into typed Pydantic v2 and v1 BaseModel classes for FastAPI, Django Ninja, and Python applications.
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.
OpenAPI to TypeScript Converter — Convert OpenAPI/Swagger specs (JSON or YAML) to TypeScript interfaces, types, or Zod schemas.
Postman to OpenAPI Converter — Convert Postman Collection v2.1 JSON to OpenAPI 3.0.0 specification.
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.
LLM JSON Schema Generator — Generate JSON Schema for LLM structured outputs — OpenAI, Anthropic, Gemini, Ollama.
AI Cost Calculator — Model and compare LLM API spend across 120+ providers for any workload with prompt caching and batch pricing.
Dockerfile Linter — Lint, validate, format, and optimize Dockerfiles with Hadolint-compatible rules, security checks, and multi-stage analysis.
JSON Schema Visualizer & Tree Explorer — Render Draft-07 / 2020-12 JSON Schemas into interactive visual trees, documentation diagrams, and realistic mock data.

Web Code Tools

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.
URL Encoder/Decoder — Encode, decode, and parse URLs and query strings instantly.
SQL Formatter — Format, minify, and validate SQL queries with dialect support.
SVG Optimizer — Optimize, minify, and clean SVG files with configurable SVGO presets.
Color Converter — Convert colors between HEX, RGB, HSL, oklch, CMYK, and 16+ formats instantly.
HTML Formatter — Format, minify, and validate HTML with attribute sorting and template support.
CSS Formatter — Format, minify, and validate CSS with property sorting and SCSS conversion.
cURL to Code Converter — Convert cURL commands to idiomatic code across 14 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.
XML Formatter — Format, beautify, validate, minify, and convert XML to JSON with syntax highlighting.
OpenAPI Validator — Validate, format, and summarize OpenAPI/Swagger specifications.
JS Minifier / Beautifier — Format, minify, and validate JavaScript code instantly.
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.
PWA Manifest & Service Worker Audit — Validate manifest.json, inspect service worker config, and flag installability issues.
GitHub Actions Validator — Validate, format and summarize GitHub Actions workflow YAML files against official schemas.
Meta Tag Generator — Generate SEO meta tags, Open Graph, Twitter Cards, and JSON-LD structured data.

Security & Crypto Tools

Hash Generator — Generate and verify cryptographic hashes with multiple algorithms.
Password Generator — Generate secure passwords, passphrases, and PINs with real-time strength analysis.
CSP Builder & Validator — Build and validate Content Security Policy headers with security scoring.
SSL/TLS Certificate Decoder — Decode PEM & X.509 certificates offline or inspect live SSL/TLS certificate chains with expiration countdowns and health checks.

Generators Tools

UUID Generator — Generate, validate, and decode UUIDs, ULIDs, and Nano IDs instantly.
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 multi-size ICO, SVG, Apple Touch, and PWA favicons from images, text, or emojis.
Mock Data Generator — Generate realistic fake JSON data from schemas, field templates, or sample data for testing and prototyping.

Date & Time Tools

Timestamp Converter — Convert between Unix timestamps, ISO 8601, and human-readable dates instantly.
Timezone Converter — Convert between time zones and find the best meeting times across cities.

Media Tools

Image Compressor — Compress and optimize images to reduce file size without noticeable quality loss.
Image Converter — Convert images between WebP, AVIF, PNG, and JPEG formats in your browser with batch processing.

Network Tools

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.
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.
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.
WebSocket Tester — Connect to WebSocket endpoints (ws:// or wss://) in real time to inspect frames, measure latency, test heartbeats, and debug payloads.
Redirect Checker — Trace URL redirect chains and detect 301, 302, 307, and 308 redirects.
Domain WHOIS — Look up domain registration info — registrar, dates, name servers, and status.
IP to Hostname — Reverse DNS lookup — resolve PTR records to find hostnames for any IPv4 or IPv6 address.
DMARC, SPF & DKIM Checker — Check DMARC, SPF & DKIM records for any domain, get an authentication score, and generate SPF/DMARC records.
CIDR & Subnet Calculator — Calculate IPv4/IPv6 subnets, network/broadcast addresses, usable IP ranges, wildcard masks, and visual bitwise subnet splitting.