# DevLint

> Free online developer workbench with 55+ browser-based utilities for JSON formatting, encoding, conversion, security, API tools, and AI/LLM tooling. All tools run client-side — no data is ever sent to a server.

## Core Tool Categories

- [JSON Formatter & Validator](https://devlint.dev/formatters/json): Format, lint, validate, minify, and tree-view JSON. Jsonlint alternative.
- [XML Formatter](https://devlint.dev/formatters/xml): Pretty-print and validate XML with tree view.
- [YAML Validator](https://devlint.dev/formatters/yaml): Validate YAML, convert to/from JSON.
- [HTML Formatter](https://devlint.dev/formatters/html): Beautify, minify, and preview HTML.
- [SQL Formatter](https://devlint.dev/formatters/sql): Format SQL queries for MySQL, PostgreSQL, SQLite.

## Encoders & Decoders

- [Base64 Encoder/Decoder](https://devlint.dev/encoders/base64): Encode and decode Base64 text and files.
- [JWT Decoder](https://devlint.dev/encoders/jwt): Decode and inspect JSON Web Tokens.
- [URL Encoder/Decoder](https://devlint.dev/encoders/url): Percent-encode and decode URLs, parse components.
- [String Escape](https://devlint.dev/encoders/string-escape): Escape/unescape for JSON, HTML, JavaScript.

## Converters

- [Timestamp Converter](https://devlint.dev/converters/timestamp): Unix epoch to human-readable date and back.
- [Color Converter](https://devlint.dev/converters/color): HEX ↔ RGB ↔ HSL ↔ CMYK.
- [Case Converter](https://devlint.dev/converters/case): camelCase, snake_case, PascalCase, kebab-case.
- [Image to Base64](https://devlint.dev/converters/image-base64): Convert images to data URIs.
- [Number Base Converter](https://devlint.dev/converters/number-base): Binary, decimal, hex, octal.
- [Unicode/ASCII Converter](https://devlint.dev/converters/unicode): Text ↔ Unicode ↔ hex ↔ binary.

## Data Transformation

- [JSON to CSV](https://devlint.dev/transform/json-csv): Convert JSON arrays to CSV with custom delimiters.
- [CSV to JSON](https://devlint.dev/transform/csv-json): Parse CSV to JSON with type inference.
- [JSON to Excel](https://devlint.dev/transform/json-excel): Export JSON to XLSX spreadsheets.
- [Excel to JSON](https://devlint.dev/transform/excel-json): Import XLSX/XLS to JSON.

## Text Tools

- [Regex Tester](https://devlint.dev/text-tools/regex-tester): Test JavaScript regex with live matching and explanations.
- [Markdown Editor](https://devlint.dev/text-tools/markdown-editor): Write Markdown with live HTML preview.
- [Text Diff](https://devlint.dev/text-tools/text-diff): Compare two texts side-by-side.
- [Word Counter](https://devlint.dev/text-tools/word-counter): Count words, characters, reading time.
- [Slug Generator](https://devlint.dev/text-tools/slug-generator): Generate URL-friendly slugs from text.
- [Line Sorter](https://devlint.dev/text-tools/line-sorter): Sort lines, remove duplicates.
- [Find & Replace](https://devlint.dev/text-tools/find-replace): Find and replace with regex support.
- [Text Cleaner](https://devlint.dev/text-tools/text-clean): Remove spaces, strip HTML, reverse text, extract emails/URLs.

## Generators

- [UUID Generator](https://devlint.dev/generators/uuid): Generate v1, v4, v5, v7 UUIDs in bulk.
- [Password Generator](https://devlint.dev/generators/password): Cryptographically secure passwords with strength scoring.
- [Hash Generator](https://devlint.dev/generators/hash): MD5, SHA-256, SHA-512, bcrypt hashes.
- [Lorem Ipsum](https://devlint.dev/generators/lorem-ipsum): Placeholder text by paragraphs, sentences, words.
- [QR Code Generator](https://devlint.dev/generators/qr-code): Generate and download QR codes as PNG/SVG.
- [Cron Builder](https://devlint.dev/generators/cron-builder): Build and parse cron expressions with next-run preview.

## JSON Intelligence

- [JSON Diff](https://devlint.dev/json-intelligence/diff): Compare two JSON objects visually.
- [JSON Size Analyzer](https://devlint.dev/json-intelligence/size-analyzer): Analyze JSON payload size and structure.
- [JSON Path Tester](https://devlint.dev/json-intelligence/json-path): Query JSON with JSONPath expressions.
- [JSON Key Sorter](https://devlint.dev/json-intelligence/json-sorter): Sort JSON object keys alphabetically.
- [JSON Repair](https://devlint.dev/json-intelligence/json-repair): Auto-fix broken JSON (trailing commas, unquoted keys, comments, LLM output).

## Security & Crypto

- [HMAC Generator](https://devlint.dev/security/hmac): Generate HMAC-SHA256/512 signatures using Web Crypto API.
- [Password Strength Checker](https://devlint.dev/security/password-strength): Analyze entropy, crack time, and composition.
- [Text Encryption](https://devlint.dev/security/text-encryption): AES-256-GCM encryption/decryption via Web Crypto.
- [Random String Generator](https://devlint.dev/security/random-string): Cryptographically secure API keys and tokens.

## API & Web Helpers

- [cURL to Fetch Converter](https://devlint.dev/api-tools/curl-to-fetch): Convert cURL commands to JavaScript fetch code.
- [Query String Builder](https://devlint.dev/api-tools/query-string): Build and parse URL query parameters.
- [URL Parser](https://devlint.dev/api-tools/url-parser): Break down URLs into all components.
- [JSON Schema Generator](https://devlint.dev/api-tools/json-schema): Generate JSON Schema Draft-07 from sample JSON.
- [Mock API Generator](https://devlint.dev/api-tools/mock-api): Generate realistic fake JSON data for testing.
- [HTTP Header Formatter](https://devlint.dev/api-tools/http-headers): Parse raw HTTP headers to JSON.

## AI & LLM Tools

- [AI Token Counter](https://devlint.dev/ai-tools/token-counter): Count tokens and estimate cost for GPT/Claude/Gemini. Live pricing from OpenRouter.
- [Prompt Formatter](https://devlint.dev/ai-tools/prompt-formatter): Clean prompts, extract template variables, format for API.
- [AI Cost Estimator](https://devlint.dev/ai-tools/ai-cost-estimator): Compare API costs across all major LLM models. Live pricing.

## Utilities

- [HTTP Status Code Lookup](https://devlint.dev/utilities/http-status): Reference for all 1xx–5xx HTTP status codes.
- [Color Palette Generator](https://devlint.dev/utilities/color-palette): Generate harmonious color schemes from a base color.
- [MIME Type Lookup](https://devlint.dev/utilities/mime-type): Find MIME types by file extension.
- [Log & Stack Trace Formatter](https://devlint.dev/utilities/log-formatter): Pretty-print logs, filter levels, extract errors.

## About

- All tools are free, client-side, and require no signup.
- Source: https://github.com/devlint (if applicable)
- Privacy: https://devlint.dev/privacy
- Contact: https://devlint.dev/contact