Dev tools · alternatives · 2026

24 alternatives to JSON Toolbox by mackan.eu

Format, convert, repair, compare JSON in your browser

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1
JSON Master▲82
Format, repair, convert, and visualize JSON, XML, YAML, CSV, and TOML. Free developer platform with advanced visualizers and AI-powered syntax repair.
2020 · jsonmaster.com · its alternatives →
2IM
I made a tool which fixes broken JSONs▲29
2024 · prakhar897.github.io · its alternatives →
3
JSON Parser Pro▲3
Free JSON toolkit — format, validate, diff & repair
Jul 2026 · freejsonparser.com · its alternatives →
4
JSON Swiss▲13
Free Swiss Army Knife for JSON Data
2025 · its alternatives →
5
JSONverify▲92
A web tool that validates and format JSON objects
2021 · jsonverify.com · its alternatives →
6
Quick JSON Formatter▲72
Quickly formats JSON with a simple right click, no copy
2023 · chromewebstore.google.com · its alternatives →
7
Fast, secure JSON Formatter with side-by-side JSON diffing▲7
The ultimate browser-based JSON toolkit. Format, validate, minify, view, and convert JSON online with zero server uploads and 100% offline privacy.
4d ago · instantjsonformatter.com · its alternatives →
8
Simple Tools▲13
Simple JSON Tool with Repair & AI Fix!
2025 · tools.mingxiangzhe.com · its alternatives →
9
JSON Formatter & Validator▲7
Professional online json tool | format, validate & convert
2025 · instantconvert.online · its alternatives →
10
Merge JSON▲5
50+ free JSON tools that run entirely in your browser
Jun 2026 · mergejsonfiles.com · its alternatives →
11
JSONHub▲3
All JSON Tools in One Place
Feb 2026 · alljsontools.com · its alternatives →
12
Online JSON Formatter Tool▲12
json formatter online, online json tool, format json
2025 · its alternatives →
13
Free JSON formatter & validator▲7
Format, validate and beautify json
2025 · formatjsononline.com · its alternatives →
14
Format JSON▲2
Paste ugly, copy pretty
May 2026 · format-json.net · its alternatives →
15
JSON Difference▲9
Compare json files online | professional json diff tool
2025 · its alternatives →
16
JSON Utils▲6
Free online json formatter, validator & editor tool
2025 · onlinejsonutils.com · its alternatives →
17
Tooly▲5
I kept opening online JSON formatters and getting buried in ads and popups. So I made a clean version with a few tools I actually use daily – JSON formatter with syntax highlighting, Base64 encoder/decoder, JWT decoder, text diff, and timestamp converter. Everything runs client-side. No tracking, no server calls, no signup walls. Built with React 19 and TypeScript. It's open source: https://github.com/chken007/tooly My 5-year-old helped name it. She insisted on "Tooly" and I couldn't argue with that logic. Open to feedback – especially if you spot bugs or have…
Dec 2025 · tooly.one · its alternatives →
18
jsonhome▲17
Format, validate, compare json online
2024 · jsonhome.com · its alternatives →
19
jsoneditor.io▲8
Json editor online and dev tool
Nov 2025 · jsoneditor.io · its alternatives →
20
JSON Editor & Validator▲2
Edit, format, diff, and repair JSON — all in your browser.
Jun 2026 · mzeeshan.me · its alternatives →
21
JSON Formatter▲2
Beautify, validate & convert JSON — free, no login and fast.
May 2026 · formatjson.online · its alternatives →
22
JSONFormatters▲4
Format, validate & convert JSON instantly
Feb 2026 · jsonformatters.com · its alternatives →
23
Online JSON Tools▲6
Online JSON Converter
2020 · its alternatives →
24
JSONSift▲10
Free developer tools that run entirely in your browser
Jun 2026 · jsonsift.com · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →