Full-featured API client that runs in your browser — make HTTP requests, edit headers/body/params, save collections, generate code snippets (cURL/Fetch/Axios). Your API keys never touch a server — everything runs locally.
Convert cURL commands to JavaScript fetch, axios, XHR, Python requests, and PHP cURL code. Everything runs locally in your browser — nothing is uploaded.
Build HTTP requests with custom method, URL, headers, and body. Generate equivalent curl commands. Everything runs locally in your browser — nothing is uploaded.
Parse cURL commands to extract method, URL, headers, and body. Debug HTTP requests from cURL strings. Everything runs locally in your browser — nothing is uploaded.
Calculate lean body mass from total weight and body fat percentage. Understand your muscle mass versus fat mass. Everything runs locally in your browser — nothing is uploaded.
Calculate your ideal body weight using Devine and Robinson formulas. Provides a healthy weight range for your height and gender. Everything runs locally in your browser — nothing is uploaded.
API Builder & Tester lets you full-featured API client that runs in your browser — make HTTP requests, edit headers/body/params, save collections, generate code snippets (cURL/Fetch/Axios). Your API keys never touch a server — everything runs locally.. It works on any device with a modern web browser.
Full-featured API client that runs in your browser — make HTTP requests, edit headers/body/params, save collections, generate code snippets (cURL/Fetch/Axios). Your API keys never touch a server — everything runs locally. It runs entirely in your browser — no software installation or data uploads required.
Configure your settings below — the output generates instantly.
No. API Builder & Tester requires an internet connection because it uses cloud-based processing for its core functionality.
Tools cover JavaScript, CSS, HTML, SQL, Python, JSON, XML, CSV, and more. Check individual tool descriptions for specifics.
No. All code processing — formatting, minification, conversion, hashing — runs locally in your browser.
Yes. Since processing is local, performance depends on your device. Most operations handle large files without issue.
Yes. SQL uses sql-formatter, JSON uses native JSON.parse, and other formatters follow widely adopted formatting rules.
Yes. All developer tools work fully offline after the initial page load.
Time Converter
Convert between time units including seconds, minutes, hours, days, weeks, months, and years with precise decimal results. Everything runs locally in your browser — nothing is uploaded.
Random Port Generator
Generate random TCP/UDP port numbers from well-known, registered, or dynamic ranges. Useful for network testing, Docker port mapping, and firewall configuration.
Chmod Calculator
Convert between numeric (755) and symbolic (u=rwx,g=rx,o=rx) chmod permission formats. See detailed breakdown for owner, group, and others.
Docker Run to Compose Converter
Convert docker run commands to docker-compose.yml format. Supports ports, volumes, environment variables, networks, restart policies, and container names.
Email Normalizer
Normalize email addresses by removing dots (Gmail), stripping +tags, and lowercasing. Process multiple emails at once for deduplication and cleaning.
Diff Checker
Compares two input texts side-by-side, highlighting inserted, deleted, and changed lines with distinct background colors. Everything runs locally in your browser — nothing is uploaded.