About Jsonviewpro
A fast, privacy-first JSON toolkit for developers. All JSON tools in one place.
What Jsonviewpro is
Jsonviewpro is a set of thirteen JSON tools that share one engine: a viewer, a formatter, a beautifier, a minifier, a validator, a structural diff, an analyzer, a JSONPath evaluator, and converters for CSV, YAML, JSON Schema and typed models in nine languages.
The goal is narrow and specific: get from “here is a JSON document” to “I understand this document and can do something with it” as quickly as possible, without an account, an upload, or a wait.
How it works
Everything runs in your browser. When you paste a document it is parsed by JavaScript in your tab. Heavy work — analysis, search, diffing, conversion, code generation — runs in a Web Worker so the interface stays responsive, and the tree and table render only the rows currently on screen so large documents scroll smoothly.
There is no server-side processing to send your data to. That is an architectural property, not a policy.
Built with
- Next.js with the App Router, in plain JavaScript.
- Monaco — the editor from VS Code — served from this domain rather than a CDN.
- @cfworker/json-schema for JSON Schema validation — an interpreter rather than a code generator, so it needs no eval and runs under a strict Content-Security-Policy. JSONPath-Plus for queries, js-yaml for YAML.
- TanStack Virtual for virtualized tree and table rendering.
- Tailwind CSS and Radix primitives for the interface.
How it is funded
Jsonviewpro is free and supported by advertising. Ads only ever appear between page sections — never inside the editor, the tree, the table or a toolbar — every slot reserves its height so nothing shifts when an ad loads, and every tool keeps working if ads are blocked or fail to load.
There is no paywall, no sign-up wall and no usage limit.
What is next
The architecture leaves room for optional accounts, saved workspaces and a browser or editor extension. None of that will change the core promise: the tools work without an account, and your JSON stays on your device.
Every tool
- JSON ViewerExplore JSON as a collapsible tree with search and copyable paths.
- JSON FormatterPretty-print messy JSON with your choice of indentation.
- JSON ValidatorCheck syntax with precise line, column and cause.
- JSON BeautifierClean up JSON with configurable indentation and key sorting.
- JSON MinifierStrip whitespace and see exactly how many bytes you saved.
- JSON DiffCompare two documents and see what was added, removed or changed.
- JSON to CSVTurn arrays of records into a spreadsheet-ready CSV.
- JSON to TypeScriptGenerate interfaces and models for nine languages.
- JSON Schema GeneratorInfer a JSON Schema from a sample document.
- JSONPath EvaluatorRun JSONPath queries and see matching values instantly.
- JSON AnalyzerProfile structure and surface data-quality problems.
- JSON to YAMLConvert JSON into readable YAML.
- YAML to JSONConvert YAML config into valid JSON.