devAPI & networking
Browse api & networking tools. Every tool processes your input locally in your browser.
API & networking
12 toolschmod Calculator
Choose owner, group, and other permissions and generate octal and symbolic modes.
Open tool →chmod to English
Explain three-digit octal file permissions.
Open tool →.env Validator
Check simple KEY=value lines and report duplicate keys. No interpolation or shell execution.
Open tool →.env Diff
Compare parsed .env key/value pairs without sending secrets anywhere.
Open tool →npm Package Name Validator
Check lowercase package names and optional scopes for common npm naming constraints.
Open tool →HAR Viewer & Sanitizer
Inspect local network logs, sort slow requests and remove selected headers, query parameters and body fields.
Open tool →OpenAPI Diff
Compare OpenAPI 3 documents for removed operations and potentially breaking schema or parameter changes.
Open tool →HTTP Header Analyzer
Analyze pasted HTTP response headers for common security and cache settings. Does not fetch URLs.
Open tool →CIDR Calculator
Calculate IPv4 network, usable range, and broadcast address locally.
Open tool →User-Agent Parser
Identify likely browser, operating system, and device from a pasted user-agent string.
Open tool →HTTP Status Reference
Look up HTTP status code meanings from an offline reference.
Open tool →OpenAPI Viewer
Summarize paths, methods, parameters, and schemas from a local OpenAPI/Swagger document.
Open tool →Every tool processes your input locally in your browser.