Developer Toolbox
Curated high-quality online tools, no installation required
CodeCraft is a free online toolbox for developers, offering 30+ utilities for JSON formatting, encoding, conversion, image processing, and more. All tools run entirely in your browser — your data never leaves your device. No account or installation required.
Why Choose CodeCraft
Local & Private
All tools run locally in your browser. Your JSON, code, or files are never sent to any server — keeping sensitive data completely private.
100% Free · No Account
Every tool is permanently free to use. No sign-up, no subscription, no limits. Open the site and start using any tool immediately.
30+ Developer Tools
JSON formatter, JWT decoder, Base64 codec, timestamp converter, regex tester, color converter, QR code generator, and many more tools used daily by developers.
Explore More
Beyond the toolbox: AI model rankings, GitHub trending projects, and AI news digests
AI Rankings
MMLU, HumanEval & MATH benchmarks for GPT-4o, Claude 3.5, Llama 3.1 and more
GitHub Trending
Curated top open source projects in AI/ML, frontend, devtools, and databases with detailed descriptions
AI News
DeepSeek-V3, OpenAI o3, Gemini 2.0 and more — curated summaries to efficiently track AI progress
All
Data & Format
(11)Format, validate, and compare JSON, XML, YAML, and Markdown structured data
JSON Formatter
Format, minify, validate JSON, supports JSONC with comments
Data & FormatJWT Decoder
Decode JWT Token Header and Payload, check expiry
Data & FormatJSON → CSV
Convert JSON arrays to CSV tables, supports download
Data & FormatYAML ↔ JSON
Convert between YAML and JSON, supports nested structures
Data & FormatMarkdown Editor
Online Markdown editor with live split-pane preview, GFM support, dark mode, and .md/.html download.
Data & FormatText Diff
Compare two texts line by line, highlight added and removed content
Data & FormatJSON Diff
Compare two JSON objects and highlight added, removed, and changed fields
Data & FormatJSONPath Query
Query JSON data with JSONPath expressions. Supports filters, wildcards, and recursive descent
Data & FormatJSON Schema Validator
Validate JSON data against a JSON Schema (Draft-07) and get detailed error messages
Data & FormatJSON Visualizer
Render JSON as an interactive collapsible tree with color-coded data types
Data & FormatXML Formatter / Minifier
Beautify or compress XML online. Syntax validation, configurable indent, copy and download
Data & FormatEncoding & Crypto
(4)Encode/decode Base64, URL, and HTML; compute SHA hashes — all in one place
Base64 Codec
Encode/decode text and files with Base64
Encoding & CryptoURL Encode/Decode
Percent-encode or decode URL special characters
Encoding & CryptoHash Generator
SHA-1 / SHA-256 / SHA-512 text hash calculation
Encoding & CryptoHTML Escape
Escape/unescape HTML special characters, prevent XSS
Encoding & CryptoConvert & Calculate
(5)Convert timestamps, number bases, colors, and physical units in real time
Timestamp Converter
Convert Unix timestamps to readable dates, supports sec/ms
Convert & CalculateBase Converter
Real-time conversion between binary, octal, decimal, hex
Convert & CalculateColor Converter
Real-time conversion between HEX / RGB / HSL formats
Convert & CalculateUnit Converter
Convert length, mass, area, volume, and data units instantly. Supports metric and imperial.
Convert & CalculateCron Parser
Parse cron expressions to human-readable descriptions
Convert & CalculateGenerators
(2)Batch generate UUIDs, custom QR codes, and other unique identifiers
Image & Media
(5)Compress images, convert formats, generate ICO favicons, and play media streams
Image to ICO
Convert PNG/JPG/WebP to multi-size ICO favicon, all local
Image & MediaImage Compressor
Compress image size online, supports JPG/PNG/WebP, adjustable quality
Image & MediaBarcode Scanner
Batch scan EAN-13, EAN-8, UPC-A, UPC-E, Code 128, Code 39, Code 93, ITF barcodes from images.
Image & MediaM3U8 Player
Play M3U8/HLS video streams online, powered by hls.js
Image & MediaHLS Player
在线播放任意 HLS 流媒体，输入 .m3u8 地址即可播放
Image & MediaNetwork & Debug
(5)IP lookup, regex testing, cron parsing, HTTP debugging, and online stopwatch
M3U8 Validator
校验与解析 M3U8/HLS 播放列表，检查语法、变体流、分片和加密信息
Network & DebugIP Lookup
Look up the location, ISP, and timezone of any IP address
Network & DebugRegex Tester
Test regex in real-time, highlight matches and capture groups
Network & DebugOnline Stopwatch
Millisecond-precision stopwatch with pause, lap recording, and CSV download.
Network & DebugAPI Tester
Postman-like HTTP & WebSocket debugger with AI streaming support, proxied via CF Worker
Network & Debug