HttpMaster
Hoppscotch
API Fortress
Postman
Assertible
Request inspector
SoapSonar
CurlHub.io
Format JSON Online
JSONFormatter.org
JSONLint
JSON Editor Online
JSON Formatter & Validator
betterjson.com
MockRest
SafeJSON.dev
Core HttpMaster features are: * HttpMaster project to store complete definition of API calls in one single place. * Broad set of http properties. * Dynamic parameters to simulate variations of input data or create global API values. * Response data validation with logical expressions. * Request chaining to use data from previous request with the next request. * Extensive data upload support, including 'multipart/form-data'. * Request data builder for creating request body with an optional dynamic parameters. * Request item execution with detailed progress monitoring. * Execution groups to create batches of requests. * Comprehensive execution data review and management. * Additional tools (basic request tool for ad-hoc execution, command line interface, OpenAPI import, etc).
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.
HttpMaster Format JSON OnlineNo features have been listed yet.
HttpMaster is well-suited for developers, QA engineers, and testers who need to perform end-to-end testing of web APIs. It's particularly beneficial for those who require a versatile testing solution with both automated and manual testing features. It's also ideal for teams that need to validate the functionality, performance, and security of their web apps through an intuitive platform.
HttpMaster's answer
Developers and testers.
Format JSON Online'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
HttpMaster's answer
Format JSON Online'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
HttpMaster's answer
Performance, simple UI, resource friendly.
Format JSON Online'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.
HttpMaster's answer
Microsoft .NET.
Format JSON Online'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)
Format JSON Online'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.
Format JSON Online'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, Format JSON Online 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 / about 1 year 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 / about 1 year ago
Hoppscotch - Open source API development ecosystem
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
API Fortress - API performance, accuracy, and uptime testing. Without code.
JSONLint - JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.
Postman - The Collaboration Platform for API Development
JSON Editor Online - View, edit and format JSON online