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DevBolt is a privacy-focused collection of 117 free developer tools that run entirely in the browser — no uploads, no accounts, no telemetry. Categories span formatting, conversion, generation, inspection, and interactive playgrounds.
Validates .env files for syntax errors, duplicate keys, security risks, and .env.example export.
Converts .env files to Docker Compose env blocks, Kubernetes ConfigMaps, and docker run flags.
Generates .gitignore files from 50+ templates across major languages and ecosystems.
Compares 23 AI models and 5 coding IDEs — pricing, context windows, capabilities.
Builds structured AI prompts with templates and variables for OpenAI, Anthropic, and Gemini.
Measures cyclomatic complexity, cognitive complexity, nesting depth, and maintainability index.
Creates code screenshots with 8 themes, syntax highlighting, and customisable backgrounds.
Compares Brotli, Gzip, and Deflate compression ratios for text content.
Parses cron schedules into plain English with the next several scheduled run times.
Builds cron expressions visually with frequency, time, and day-of-week controls.
Validates and formats Docker Compose files, checking services, networks, and volumes.
Validates and lints Dockerfiles for syntax errors, security issues, and best practices.
Converts ESLint configs to Biome — maps 100+ rules from core, TypeScript, React, and import plugins.
Builds git commands visually with 80+ cheat-sheet entries covering branching, merging, and stashing.
Renders unified git diff output with syntax highlighting and side-by-side or inline display.
Validates GitHub Actions workflow YAML for syntax, triggers, jobs, and deprecated actions.
Converts GraphQL SDL schemas to TypeScript interfaces, types, enums, and operations.
Complete reference of HTTP status codes with explanations, common causes, and use cases.
Formats, validates, and minifies JSON with structural error reporting.
Generates realistic fake JSON data for API testing with 30+ field types and schema builder.
Visualises JSON as an interactive tree — collapsible nodes, search, path copy, and stats.
Generates typed structs and classes from JSON in Go, Python, Java, C#, Dart, Rust, Swift, and Kotlin.
Generates GraphQL schema definitions from JSON with type inference and Query/Mutation generation.
Converts JSON or JSON Schema to Zod validation schemas with $ref resolution and format constraints.
Runs JavaScript and TypeScript code in the browser with instant console output.
Validates Kubernetes manifests for syntax, required fields, best practices, and security.
Counts tokens and estimates API costs for GPT, Claude, Gemini, and other LLMs.
Builds MCP configuration files visually for Claude Desktop, Cursor, VS Code, and Windsurf.
Writes and previews Markdown with live rendering and syntax highlighting.
Builds Markdown tables visually with CSV import and alignment controls.
Generates nginx config files — server blocks, SSL, reverse proxy, gzip, load balancing, security headers.
Converts numbers between binary, octal, decimal, and hexadecimal bases.
Previews and debugs Open Graph, Twitter Card, and SEO meta tags for social sharing.
Converts OpenAPI 3.x and Swagger 2.0 specs to TypeScript interfaces and operation types.
Generates customisable QR codes from text or URLs.
Generates professional GitHub README.md files with badges, installation, and usage sections.
Generates regex patterns from natural-language descriptions with visual composer and live tester.
Runs SQL queries against a WebAssembly SQLite database — JOINs, CTEs, window functions, aggregations.
Converts SQL CREATE TABLE statements to TypeScript interfaces, Prisma schemas, and Drizzle definitions.
Converts SVG to JSX or a React/TypeScript component with forwardRef, memo, and props spread.
Analyses tsconfig.json for TS 6.0 breaking changes, deprecated options, and readiness grade.
Strips TypeScript types, interfaces, enums, and generics to produce clean JS output.
Encodes and decodes URLs using encodeURIComponent and encodeURI.
Parses URLs into protocol, host, path, and query-string components.
Converts text into URL-friendly slugs with Unicode transliteration and bulk mode.
Formats, beautifies, validates, and minifies XML documents.
Generates Zod validation schemas from JSON with auto-detection of common formats.
Converts cURL commands to JavaScript, Python, Go, PHP, Ruby, and Java code.
Generates package.json visually with framework presets, dependency editor, and scripts.
Generates robots.txt files with crawl rules for Googlebot, Bingbot, AI bots, and more.
Builds TypeScript tsconfig.json visually with framework presets and inline explanations.
Designs CSS border-radius visually with per-corner controls and unit selection.
Designs CSS box shadows visually with multi-layer stacking and live preview.
Builds CSS keyframe animations visually with presets and live preview.
Creates CSS clip-path shapes visually with 13 shape presets and interactive preview.
Builds CSS filter effects visually — blur, brightness, contrast, hue-rotate, sepia, drop-shadow.
Scans JavaScript and TypeScript for hardcoded secrets, injection, XSS, SSRF, and 20+ vulnerability checks.
Builds Content Security Policy headers visually with framework presets and security analysis.
Computes MD5, SHA-1, SHA-256, SHA-384, and SHA-512 file hashes via drag-and-drop.
Builds HTTP requests visually and generates client code in cURL, JavaScript, Python, Go, Rust, and PHP.
Generates SHA-1, SHA-256, SHA-384, and SHA-512 hashes of input text.
Converts between CSV and JSON with custom delimiters and column handling.
Converts HTML to JSX — class→className, inline styles to objects, self-closing tags, SVG attributes.
Converts between HTML and Markdown bidirectionally.
Converts JSON arrays to CSV with nested-object flattening and column selection.
Minifies and beautifies JavaScript, CSS, and HTML code.
Compares two JSON objects and reports structural differences with key-level granularity.
Tests JSONPath expressions against JSON data with real-time evaluation.
Validates JSON data against JSON Schema (Draft 07) with detailed error reporting.
Encodes and decodes Base64 strings with Unicode support.
Base64, Base32, Hex, Binary, URL, and HTML encoding and decoding in one tool.
Encodes and decodes HTML entities, special characters, and symbols.
Converts images to Base64 data URIs and decodes Base64 back to images.
Converts text to binary, hex, octal, or decimal — with UTF-8 round-trip.
Converts JSON arrays to SQL CREATE TABLE and INSERT statements with type inference.
Validates OpenAPI 3.x and Swagger 2.0 specs for structure, schemas, security, and best practices.