ASAPUtils
Debug the integration.
Keep the payload private.
Focused browser tools for API requests, JSON, auth, schemas, mocks, and agent workflows. Inputs are processed on your device unless you explicitly send a request to an endpoint you choose.
Flagship toolkit
Start with the tools developers use most
API Tester (Online REST Client)
A free online API tester and REST client that runs in your browser — a lightweight Postman alternative. Send GET, POST, PUT, DELETE requests with custom headers, auth, and JSON bodies, and inspect the response. No install, no account.
Open tool →API Request Builder
Build API requests with an intuitive UI and instantly generate code snippets for cURL, Fetch, and Axios.
Open tool →API Mock Server Generator
Instantly generate mock API server code for Express, Next.js, or MSW from a JSON payload. Runs entirely in your browser, free forever.
Open tool →JSON Formatter Online — Beautify & Pretty Print JSON
Free online JSON formatter and beautifier. Instantly pretty print, validate, and format JSON with 2 or 4-space indentation. Runs 100% in your browser.
Open tool →JSON to TypeScript
Instantly convert JSON objects into robust TypeScript interfaces using the Developer Transformation Engine.
Open tool →JWT Decoder Online - Decode JSON Web Tokens Instantly
Use our secure JWT decoder to instantly decode and inspect JSON Web Tokens in your browser. View the header, payload, and claims without server uploads.
Open tool →Regex Tester Online - Test Regular Expressions Instantly
Free online regex tester with real-time match highlighting. Test regular expressions against any string instantly in your browser. No server uploads.
Open tool →Cron Expression Generator
Free online cron expression generator and tester. Build crontab schedules from simple fields, translate cron to plain English, and preview the next run times instantly. 100% in your browser, no uploads.
Open tool →New experiment · same domain
AgentSpec Lab
Help shape a portable manifest for agent identity, capabilities, tools, and guardrails. The early product lives inside ASAPUtils while we validate real usage.
Try the browser MVP →Built-in distribution
Use a tool where the work happens
Every tool already supports a chrome-free embed with ?embed=1. CLI, npm, GitHub Action, and browser-extension releases will follow the workflows that earn repeat use.
Privacy, stated precisely
Local by default
Formatters, converters, and generators process inputs in your browser.
Explicit network actions
API tools connect only to the endpoint you ask them to contact.
No input analytics
Completion events contain tool and action names, never pasted content.