JSONToonPro
A free JSON toolkit with 12 tools, all running privately in your browser
Visit jsontoonpro.com
12
Tools in one place
Free
No cost, no sign-up
Private
Your data stays with you
Fast
Results appear instantly
Client
Internal product by Revviz
Status
Live and actively growing
Tech stack
Next.js, TypeScript, Monaco Editor, Client-side only, SEO architecture
JSONToonPro brings 12 of the most-used JSON tools together in one fast, free workspace. Everything runs right inside the web browser, so a user's data never leaves their own computer. We designed, built, and launched the entire product end to end.
01 · The problem
Developers were losing time juggling multiple JSON tools
JSON is the format most apps use to move data around, and developers work with it every day. Cleaning it up, checking it for errors, turning it into a spreadsheet, or converting it into another format usually means hunting down a different website for each task.
That creates two everyday frustrations. People waste time jumping between tools and pasting the same data over and over. And most of those free online tools quietly send your data to their server, which is a real privacy concern when the data is sensitive.
The core insight
People do not need more JSON tools. They need one trusted place where all the tools live and none of them send your data anywhere.
02 · The approach
Everything runs in the browser, nothing gets uploaded
The big decision was simple: do all the work right on the user's own device, never on a server. That makes the tools more trustworthy, because your data never leaves your computer, and faster, because there is no waiting for a server to respond. We also gave each tool its own page so it can be found on Google for exactly what people search for.
03 · What was built
12 tools in one workspace
JSON Formatter
Format and beautify messy JSON with syntax highlighting
JSON Beautifier
Indented, readable output with configurable spacing
JSON Minifier
Strip whitespace for production payloads
JSON Validator
Inline error messages pointing to the exact problem line
JSON to CSV
Flatten JSON arrays into comma-separated spreadsheet rows
JSON to YAML
Convert config files between formats instantly
JSON to XML
Produce valid XML with proper element naming
JSON to SQL
Generate INSERT statements ready to run in any database
JSON to Excel
Download a .xlsx file directly from any JSON array
JSON to TypeScript
Generate typed interfaces in dependency order, download as types.ts
JSON to GraphQL Schema
Infer scalar types, detect ID fields, add a Query type
JSON Schema Validator
Generate a draft-07 schema from sample data, then validate real payloads
04 · Highlights
Engineering decisions worth noting
Code that writes code
One of the tools reads your data and writes ready-to-use developer code from it automatically. It is smart enough to put everything in the right order, so the result works straight away with no manual cleanup. What used to be a tedious, error-prone chore becomes a single click.
Handles messy, real-world data
Real data is rarely perfect, and some records have fields that others do not. Instead of looking at only the first record, the tools check every record before producing a result. That means the output stays accurate even when the data is inconsistent, which is exactly when other tools get it wrong.
Catches errors and shows exactly where
The validator does not just say something is wrong. It points to the precise field that has the problem, so users fix issues in seconds instead of hunting through a wall of text. It can also build a set of rules from a sample and then check new data against them.
05 · Results
Live, indexed, and growing
What launched
All 12 tools live and working from day one, covering the most common JSON tasks
Built to be found
Each tool has its own page, so it can show up on Google for exactly what people search
Private by design
Data is processed inside the browser and is never sent to a server
Fast everywhere
Pages load quickly and results appear instantly, even on a phone
Want something like this built for your product?
Revviz builds developer tools, SaaS products, and marketing sites with the same attention to SEO architecture, privacy, and performance.