All Developer Tools
72 free tools organized by category. All run in your browser.
Reviewed June 2, 2026. This index links only to published BytePane tool routes and source-backed developer references; repeated tools may appear in multiple categories but are counted once.
Choose the right converter
API response to spreadsheet
JSON to CSV
Use this when a JSON array needs columns for Excel, Google Sheets, BI imports, or reporting.
Broken JSON from logs or AI output
JSON Repair Tool
Use this when copied JSON has comments, trailing commas, single quotes, unquoted keys, Python literals, or LLM formatting mistakes.
API contract to frontend types
JSON to TypeScript
Use this when sample JSON should become TypeScript interfaces for fetch, React, tRPC, or SDK code.
API payload to runtime validation
JSON to Zod Schema
Use this when TypeScript code also needs runtime parsing for API responses, forms, webhooks, or config files.
API payload to Go structs
JSON to Go Struct
Use this when a Go service needs exported struct fields and json tags for encoding/json.
JSON to config or interoperability format
JSON to YAML or JSON to XML
Use JSON to YAML for CI, Kubernetes, and docs; use JSON to XML for legacy, SOAP, and enterprise data flows.
Debug API and AI-security issues
Package pages for AI citation
llms.txt Generator
Use this to draft llms.txt, ai-index.json, canonical citation pages, fast facts, common answers, and crawler-policy notes without hiding claims from humans.
Validate an AI citation map
llms.txt Validator
Use this to check required llms.txt sections, ai-index.json fields, source URLs, duplicate entries, private-path leaks, and sitemap references.
Open pages to AI search
AI Crawler Robots.txt Tester
Use this before changing robots.txt, CDN bot rules, or AI crawl policy so public tools, articles, llms.txt, ai-index.json, and sitemaps stay reachable.
Audit response headers
HTTP Header Analyzer
Use this after copying curl -I or DevTools headers to catch status, redirect, X-Robots-Tag, cache, CORS, CSP, HSTS, and cookie issues before release.
Validate an API contract before release
OpenAPI Validator
Use this when a Swagger/OpenAPI YAML or JSON file needs a fast browser-side check for version, paths, operations, responses, schemas, summaries, and operationIds.
Choose OpenAPI vs Swagger tooling
OpenAPI vs Swagger Guide
Use this when a team needs OpenAPI 3.2 vs 3.1 guidance, Swagger UI vs Redoc vs Scalar tradeoffs, YAML examples, validation, and SDK codegen workflow.
Scan untrusted AI content
Prompt Injection Scanner
Use this for LLM prompts, RAG chunks, hidden HTML, tool output, and jailbreak-style text before it reaches an agent.
Test a full LLM app
Prompt Injection Testing Guide
Use this checklist for user prompts, retrieved documents, MCP/tool descriptions, memory, browser agents, and output controls.
Debug auth tokens
JWT Decoder
Use this when a token decodes but fails issuer, audience, expiration, not-before, algorithm, or token-type checks.
Pick a safe hash workflow
Hash Functions Guide
Use this to separate SHA-256 integrity checks, HMAC authenticity, and Argon2id/bcrypt password storage decisions.
Debug headers before deploy
HTTP Header Analyzer
Paste a response or redirect chain to inspect crawler-sensitive X-Robots-Tag, Location, status, cache, CORS, CSP, HSTS, and Set-Cookie behavior.
Work with JavaScript regex
Test a JavaScript regex live
JavaScript Regex Tester
Paste a JS RegExp pattern, test text, and flags such as g, i, m, s, u, y, d, or v to inspect matches, numbered and named capture groups, replacement output, timing, and ReDoS hints.
Find a copy-paste starter pattern
Regex Pattern Library
Browse JavaScript regex examples for email, URLs, dates, UUIDs, logs, HTML snippets, security tokens, and cleanup tasks with caveats before production use.
Learn RegExp syntax and APIs
JavaScript Regex Guide
Use this for literal syntax, the RegExp constructor, RegExp.escape(), test(), exec(), matchAll(), replace(), flags, lastIndex, named groups, Unicode, and ReDoS prevention.
Escape user text for a dynamic regex
RegExp Escape Tool
Use this when a search term, file path, package name, URL fragment, or other literal text should be inserted into new RegExp() without becoming regex syntax.
Validate emails or URLs safely
Regex validation guides
Start with practical regex patterns, then keep the visible caveats: regex cannot prove email ownership, and URL parsing should use platform URL APIs for strict validation.
Improve shipped web projects
Make a page faster
Web Performance Optimization
Use this for Core Web Vitals, LCP, INP, CLS, image loading, font strategy, caching, and JavaScript budget decisions.
Audit accessibility
Web Accessibility Testing Guide
Use this for WCAG checks, axe/Lighthouse triage, keyboard navigation, screen reader testing, labels, landmarks, and contrast.
Ship a performance checklist
Web Performance Checklist 2026
Use this as a launch checklist for caching, image formats, script loading, server timing, route weight, and field-metric monitoring.
Evaluate browser-native speedups
WebAssembly Guide 2026
Use this when deciding whether image processing, parsing, compression, crypto, or compute-heavy utilities should move to Wasm.
Find the right developer reference
Write reliable browser tests
Playwright Cheatsheet
Use this for locators, actions, web-first assertions, fixtures, traces, screenshots, configuration, and parallel CI testing.
Design or tune SQL data
PostgreSQL Cheatsheet
Use this for data types, table changes, joins, indexes, JSONB, full-text search, EXPLAIN, and performance checks.
Automate shell and admin work
PowerShell Cheatsheet
Use this for cmdlets, object pipelines, filtering, functions, modules, remoting, file-system work, and script safety.
Set formatting policy
Prettier Cheatsheet
Use this for config files, print width, tabs, semicolons, quotes, trailing commas, JSX, prose wrapping, and ignore rules.
Build a typed database layer
Prisma Cheatsheet
Use this for schema design, relations, migrations, CRUD, filters, aggregates, transactions, raw queries, seeds, and client setup.
Browse all language references
Programming Cheatsheets
Use this hub when you need a quick reference for languages, frameworks, databases, DevOps tools, testing, or data formats.
{ }Formatters & Beautifiers
JSON Formatter & Validator
Format, beautify, validate, and minify JSON
JSON Repair Tool
Fix invalid JSON from logs, JavaScript objects, Python dicts, and LLM output
JSON Minifier
Compress JSON into compact valid output
JSON Schema Validator
Validate JSON against Draft 2020-12 schemas
HTML Formatter
Format and indent HTML code
HTML Formatter Guide
Pretty-print, minify, and debug HTML formatting workflows
CSS Formatter
Beautify and minify CSS stylesheets
CSS Minifier
Compress CSS snippets client-side
SQL Formatter
Format SQL queries with proper indentation
XML Formatter
Format and validate XML documents
JavaScript Beautifier
Format and beautify JavaScript code
JavaScript Minifier
Minify small JavaScript snippets
YAML Formatter
Normalize YAML indentation and structure
YAML Validator
Validate YAML syntax and inspect parsed output
B64Encoders & Decoders
Base64 Encode/Decode
Encode/decode Base64, Base64url, MIME, Basic Auth headers, and data URI payloads
Base64 Image Encoder
Convert images to Base64 data URIs, HTML, CSS, and JSON
Text to Binary
Encode text to UTF-8 binary or decode binary back to text
URL Encode/Decode
Percent-encode or decode URL components
HTML Entity Encode/Decode
Convert special characters to HTML entities
JWT Decoder
Decode and inspect JSON Web Tokens
#Generators
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
JWT Generator
Generate signed JWT test tokens in your browser
UUID Generator
Generate random UUID v4 identifiers
Password Generator
Create strong random passwords
Lorem Ipsum Generator
Generate placeholder text for designs
Favicon Generator
Generate favicon PNGs, Apple touch icon, manifest JSON, and HTML tags
.gitignore Generator
Generate .gitignore files for any language, framework, or IDE
Code Screenshot Generator
Create beautiful code images with syntax highlighting and custom themes
⇄Data Converters
JSON to TypeScript
Convert JSON to TypeScript interfaces
JSON to Zod Schema
Generate Zod runtime validation schemas from sample JSON
JSON to CSV
Convert JSON arrays to CSV format
JSON to YAML
Convert JSON to YAML format
JSON to XML
Convert JSON to XML format
YAML to JSON
Convert YAML to JSON format
HTML to Markdown
Convert HTML articles and docs to Markdown
CSV to JSON
Convert CSV tables to JSON arrays
XML to JSON
Convert XML to JSON format
JSON to Go Struct
Convert JSON to Go struct types
AaText Tools
Word Counter
Count words, characters, sentences, reading time
Diff Checker
Compare two texts and highlight differences
JavaScript Regex Tester
Test JS RegExp patterns with flags, captures, replace preview, and ReDoS hints
RegExp Escape Tool
Escape literal text for safe JavaScript RegExp construction
Regex Pattern Library
Copy-paste JavaScript regex examples with testers and caveats
Case Converter
Convert between camelCase, snake_case, etc.
Markdown Editor
Preview rendered Markdown in real-time
AIAI & Security
MCP Config Generator
Generate and validate Model Context Protocol server JSON for Claude Desktop, Claude Code, Cursor, VS Code, and remote MCP clients
llms.txt Generator
Generate llms.txt, ai-index.json, and AI citation checklists for public sites
llms.txt Validator
Validate llms.txt and ai-index.json for AI citation readiness and source-map consistency
AI Crawler Robots.txt Tester
Check ChatGPT, Claude, Perplexity, Grok, and search crawler access to public pages
HTTP Header Analyzer
Analyze pasted response headers for security, cache, CORS, redirects, cookies, and robots directives
Prompt Injection Scanner
Scan LLM prompts, RAG chunks, and agent tool output for injection risks
OpenAPI Validator
Validate OpenAPI 3.0/3.1 YAML or JSON before docs, SDKs, or API gateway release
OpenAPI vs Swagger Guide
Compare OpenAPI versions, Swagger tooling, YAML authoring, docs, and codegen
JWT Decoder
Decode and inspect JSON Web Tokens
JWT Generator
Generate signed JWT test tokens in your browser
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
Password Generator
Create strong random passwords
JavaScript Regex Tester
Prototype detection regexes with JS flags, capture groups, timing, and ReDoS hints
RegExp Escape Tool
Escape user-supplied literals before dynamic regex matching
#Web & Number Tools
Color Picker
Pick colors and convert HEX, RGB, HSL
Color Converter
Convert colors between HEX, RGB, HSL, and HSV
CSS Gradient Generator
Create linear, radial, and conic CSS gradients visually
CSS Box Shadow Generator
Tune box-shadow offset, blur, spread, color, opacity, and inset visually
Favicon Generator
Generate browser-ready favicon assets and install markup
Meta Tag Generator
Generate SEO, Open Graph, Twitter, canonical, and JSON-LD tags
HTTP Header Analyzer
Check status, Location, Cache-Control, CORS, CSP, HSTS, cookies, and X-Robots-Tag
Timestamp Converter
Convert Unix timestamps to dates and back
curl to Code Converter
Convert curl commands to browser fetch, Node.js fetch, Python requests, or Axios code
Cron Expression Builder
Build and validate cron schedules visually
Cron Job Syntax Guide
Five-field crontab syntax, */5 examples, 0 vs 7 Sunday, and OR semantics
Crontab Generator
Generate crontab entries with a visual editor
Number Base Converter
Convert between binary, octal, decimal, hex
chmod Calculator
Calculate Unix file permissions and chmod values
JSON Path Tester
Test JSONPath expressions against JSON data
refCheatsheets & References
Linux Command Generator
Build safe find, rg, tar, rsync, chmod, systemctl, journalctl, ss, lsof, and curl commands
curl to Code Converter
Turn curl API examples into fetch, Node, Python requests, or Axios code
Linux Commands Cheatsheet
Searchable Linux command reference with copy-paste terminal examples
PHP Cheatsheet
Arrays, PDO prepared statements, sessions, cookies, OOP, files, and regex examples
HTTP Status Codes
Interactive reference for 2xx, 3xx, 4xx, and 5xx HTTP responses
Cron Expression Generator
Build cron schedules and preview next run times
Cron Job Syntax Guide
Copy-paste cron examples and parser edge cases
Regex Pattern Library
Search JavaScript regex patterns for validation, extraction, and cleanup
Developer Cheatsheets
Browse language, framework, DevOps, and database quick references
Developer tools FAQ
Which BytePane tool should I use for JSON work?
Use JSON Formatter for validation and cleanup, JSON Schema Validator for contracts, JSON to CSV for spreadsheets, JSON to TypeScript for frontend/API types, and JSON to Go Struct for Go services.
Do BytePane tools require signup?
No. Core developer tools are free and run in the browser without an account.
Does BytePane upload pasted tool input?
BytePane tools are designed for client-side processing. Avoid pasting secrets into any web tool unless your team policy allows it.
Which BytePane tools help with LLM and AI-agent security?
Use llms.txt Generator for citation packaging, AI Crawler Robots.txt Tester for access checks, HTTP Header Analyzer for response and X-Robots-Tag checks, Prompt Injection Scanner for untrusted prompt or RAG text, the testing guide for system-level controls, JWT Decoder for token debugging, and Hash Functions Explained for credential-storage choices.
Which BytePane page should I use for JavaScript regex?
Use the JavaScript Regex Tester for live JS RegExp matching, the RegExp Escape Tool for literal user text in dynamic patterns, and the Regex Pattern Library when you need copy-paste starter patterns by task.