MockRest
JSONing API
JSON Placeholder
ReqRes
Beeceptor
Sup! Standup Bot
Mockae
Digital Humani
FormatJSONOnline
JSONFormatter.org
JSONLint
JSON Formatter & Validator
JSON Editor Online
Easy JSON Viewer
JSONCompare
JSON Comparator
Mock REST endpoints in seconds. Test without backend delays. Built for developers who need reliable mock data now.
Format JSON Online is a fast, free, and privacy-focused tool to format, validate, minify, and beautify JSON data directly in your browser. Built for developers and API testers, it offers support for large JSON files without requiring login or sending data to a server. Additional features like JSON-to-CSV, JSON-to-XML, and cURL conversion make it a versatile tool for debugging, transforming, and visualizing JSON. Light ads may be introduced in the future to support development, but user privacy and experience will always be top priorities.
MockRest FormatJSONOnlineFormatJSONOnline's answer:
FormatJSONOnline is used by developers and teams across companies and institutions, though exact names aren’t tracked due to privacy-first architecture. However, notable daily users include:
Developers from GitHub
Engineers at Microsoft (based on public traffic data)
API testers from Postman community
Students from Indian Institutes of Technology (IITs)
Indie hackers and open-source contributors
FormatJSONOnline's answer:
React.js (for UI and client-side rendering)
Tailwind CSS (for fast and clean styling)
Next.js (for performance and SEO)
Vercel (for deployment and CDN optimization)
FormatJSONOnline's answer:
Unlike many JSON tools that are bloated, ad-heavy, or slow, FormatJSONOnline is:
Blazing fast, even for large (20MB+) files
Privacy-focused, with zero data sent to any server
Minimalist and distraction-free
Mobile and tablet responsive It’s designed specifically for developers who value performance and simplicity.
FormatJSONOnline's answer:
The idea came while working on multiple API integrations where formatting large JSON responses quickly became frustrating. Most existing tools either lagged, required uploading sensitive data, or were filled with ads. FormatJSONOnline was built as a clean, fast, and secure alternative that works instantly, with no signup, no tracking, and no BS.
FormatJSONOnline's answer:
The primary audience includes:
Front-end and back-end developers
API testers and engineers
Data analysts and tech leads
Students and hobby coders working with JSON
FormatJSONOnline's answer:
FormatJSONOnline is uniquely optimized for speed, privacy, and simplicity. It processes even large JSON files with minimal delay, works entirely on the client-side (nothing is sent to a server), and offers formatting, validation, minification, and copy-to-clipboard — all in one place with zero tracking or ads.
Based on our record, FormatJSONOnline seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
In this guide, you'll learn how to format, validate, and manipulate JSON data in your browser using Format JSON Online, a fast, privacy-first tool for developers. - Source: dev.to / 4 months ago
This list spans the entire frontend dev lifecycle—learning, coding, designing, testing, and deploying. Tools like Format JSON Online are clutch for handling JSON data, a common task when building API-driven apps. Save these links, and you’ll be ready to tackle any frontend challenge! - Source: dev.to / 4 months ago
JSONing API - Free and open-source mock API for testing and prototyping. Easily create a mock API from JSON data, with the ability to define custom rules for HTTP status codes, headers, and response bodies.
JSONFormatter.org - Online JSON Formatter and JSON Validator will format JSON data, and helps to validate, convert JSON to XML, JSON to CSV. Save and Share JSON
JSON Placeholder - JSON Placeholder is a modern platform that provides you online REST API, which you can instantly use whenever you need any fake data.
JSONLint - JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.
ReqRes - A hosted REST-API ready to respond to your AJAX requests.
JSON Formatter & Validator - The JSON Formatter was created to help with debugging.
