JSON Kit
Fix broken AI JSON and 6 more JSON tools, all in-browser
JSON Kit launched on May 31, 2026 with 10 votes, #1,220 of 20,538 launches that month and more than 90% of that year's launches.
What it does
JSON Kit is a set of fast, browser-side JSON tools built for the AI era. The standout is Fix LLM JSON: paste the broken JSON that ChatGPT, Claude, or local models hand you, and get clean, valid JSON back instantly, with a label for exactly what was wrong (trailing commas, single quotes, Python literals, markdown fences, truncated output, and more). Everything runs 100% in your browser, so your output never touches a server.
40+ free JSON tools for developers: formatter, validator, converter to TypeScript/Zod/Pydantic, LLM JSON repair, diff, and more. 100% browser-side, no data sent to servers.
40+ free JSON utilities for developers — formatter, validators, converters, LLM repair tools, and more. 100% browser-side. No data sent to servers. Every tool runs in your browser. Your data never touches our servers. Built for the workflows that did not exist 3 years ago — LLM repair, schema generation, AI output parsing. Monaco Editor handles 50MB+ files without freezing. Built for real-worldfrom jsonkit.co
Does a similar job
all alternatives →- IMI made a tool which fixes broken JSONs2024 · prakhar897.github.io · ▲29
JSON Master2020 · jsonmaster.com · ▲82Format, repair, convert, and visualize JSON, XML, YAML, CSV, and TOML. Free developer platform with advanced visualizers and AI-powered syntax repair.
- ICI coded my own JSON translation tool to easily localize my side project2024 · quicklang.app · ▲43
Hi HN, I’m Joan, the developer of Quicklang. I made this app to easily translate and keep in sync all my localization JSON files for my side projects. While searching online for a similar tool, I only found enterprise solutions that do not allow direct editing of JSON files. I used to use ChatGPT to translate the JSON translation file changes before coding Quicklang. However, I realized that ChatGPT only allows you to input short content for translation into another language (even if you provide a .json file), and each time I had to request translations for one language at a time. So, I…
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