DevTools is a free online developer tools site covering JSON formatting, format conversion, encoding, regex debugging, favicon generation, and IP quality checks. Most tools run locally in your browser with no signup required.
Convert between common formats: CSV/JSON, YAML/JSON, TOML/JSON, Markdown/HTML, timestamps, image Base64, text encodings, and number bases.
Format and beautify SQL, HTML, XML, and YAML, plus a regex debugger—all run locally in the browser, free with no sign-up.
Full JSON toolkit: format, validate, minify, convert to CSV/XML, diff, generate and validate Schema, JSONPath, and tree view—all processed locally in the browser.
Upload a logo, preview browser and Google search results, configure iOS/Android icons, and generate a complete favicon package in one click.
Base64, JWT, SHA256, MD5, HMAC, Bcrypt, RSA keys, SSL certificates, and password strength—common encoding and security text utilities.
UUID, strong passwords, QR codes, regex patterns, fake data, and Crontab generators—all run locally in the browser, free with no sign-up.
Test APIs, inspect HTTP response headers, parse User-Agent, run DNS lookups, and debug WebSocket and CORS—for frontend/backend integration and troubleshooting.
Analyze IP type, country/ASN, RDAP registration, and browser leak signals—useful for basic risk control and environment checks.
DevTools includes JSON tools (format, validate, minify, to CSV/XML, diff, JSONPath, schema), converters (CSV/YAML/TOML/Markdown/timestamp/number base), formatters (SQL/HTML/XML/YAML/regex debugger), encoding (Base64, JWT, SHA256, MD5, HMAC, RSA, SSL certificates), generators (UUID, password, QR code, crontab, fake data, regex), API & Web tools (URL encode, DNS, CORS, WebSocket), favicon generator, and IP quality check.
No signup required — DevTools is free. Most tools process data locally in your browser without uploading text to a server. Server-side tools (DNS lookup, IP check, CORS check) are clearly documented on their pages.
The site supports Chinese (default) and English. Tool pages, navigation, and instructions are available in both languages via the locale switcher in the header.
Browse all tool categories on the DevTools homepage. The JSON formatter is at /tools/json/format. You can also use the Tools dropdown in the header to jump by category.
The AI News page aggregates daily AI industry picks from AI HOT, refreshed about every 30 minutes with the latest 50 items. Chinese only.