Best Programming Toolkit has been discontinued. Similar sites and apps include DevToys, which is free and open source. Other options are JSON Crack, Omni Tools, JSON Sage and DevToys for Mac. There's no shortage of JSON Viewers like Best Programming Toolkit, with more than 25 alternatives for Mac, Linux, Windows, Android and self-hosting.
AllJSON is a free, fast, browser-based tool for working with JSON. It validates messy JSON, lets you explore it as an interactive tree, and turns clicked fields into BigQuery / Snowflake-style SQL — all without sending data anywhere.
Poland
EU
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.
India
A free web app providing 200+ online tools for developers, including JSON formatters, PDF mergers, code converters, data generators, and more—no signup required.
The JSON Formatter was created to help folks with debugging. As JSON data is often output without line breaks to save space, it can be extremely difficult to actually read and make sense of it. This tool hoped to solve the problem by formatting and beautifying the JSON data so...
United States
OmniDeck Pro is a unified, offline-first desktop powerhub designed to replace dozens of single-purpose browser tabs and scattered utilities.
India
DevUtilHub provides 24+ free online developer tools including regex tester, Base64 encoder/decoder, JWT debugger, JSON formatter, hash generators, and more. All tools run entirely in your browser for maximum privacy and speed. No signup required.
JSONXMLKit is a free, browser-based toolkit designed to streamline the handling of structured data formats like JSON and XML. It offers a suite of utilities that allow developers, data analysts, and technical professionals to:
United Kingdom
UnblockDevs is a free suite of developer tools that runs 100% in your browser — nothing is sent to servers, no signup required.
United States
Need to convert a XML file to JSON? This online converter allows you to convert between XML and JSON within few seconds. While the XML format is a markup language designed to define encoding rules for documents the JSON format is focused on human readable text to transmit data...
Free JSON & Markdown workbench — format, validate, diff, chart, generate types, test APIs. Runs 100% in your browser, no signup, no uploads.
India
DataLensia is a privacy-first, browser-based data toolkit that lets you visualize CSV datasets and work with JSON/NDJSON using tools like a JSON comparator, schema generator, editor, and converter — all processed locally.
