Why we built Lintify
Every developer who works with JSON for long enough ends up with a folder of bookmarks — one for validation, one for formatting, one for converting to CSV, one for decoding JWTs, and so on. Each of those bookmarks is a different site, with a different UI, a different privacy policy, and a different set of dark patterns. Some of them upload your data. Some of them break when you paste a large file. Some of them put a signup wall in front of the result. We got tired of all of it.
Lintify is our attempt to do better. One site, every JSON tool you actually need, with a consistent UI, clean design, and a strict no-upload policy. Every parser runs in your browser using the same open-source JavaScript libraries you would use yourself. There is no backend, no database, no analytics on your data. The site is static, deployed to Cloudflare Pages, and free to use.
Three things that will never change
Your data stays on your machine. Every tool on Lintify runs entirely in your browser. When you paste a JSON document into the validator, the parsing happens in the JavaScript engine you are already running. Your data never leaves your device. This is not a privacy feature layered on top of a server-based tool — it is how the site is built, from the ground up.
The tools are free, with no signup.No account, no rate limit, no daily quota. Lintify is paid for by unobtrusive ad slots — there is one at the top of each page and one in the middle of long pages. No paywall, no "pro" tier, no upsell.
The site is fast. There is no network round-trip for any tool operation. A 5 MB JSON file validates in the time it takes a server-based tool to finish accepting the upload. The site itself is a static export — every page is pre-rendered, so navigation between tools is instant.
How Lintify is built
Lintify is built with Next.js and deployed to Cloudflare Pages as a static site. The tools themselves are thin React wrappers around the same open-source JavaScript libraries you would reach for in your own code:ajv for JSON Schema validation,js-yaml for YAML, json2csv for CSV conversion, jsonpath-plus for JSONPath queries, fast-xml-parser for XML,jwt-decode for JWTs, andSheetJS for Excel. There is no proprietary engine under the hood.
The source code is open. If a tool ever stops working, you can reproduce its behavior in a Node REPL with the same libraries. If you want a tool that Lintify does not have, pull requests are welcome.
Who is behind Lintify
Lintify is built by a small team of developers who work with JSON every day — API engineers, infrastructure folks, and the occasional data analyst. We built Lintify because we needed it ourselves. The tools we add are tools we use; the bugs we fix are bugs we hit. If you have a feature request or a bug report, please reach out — we read everything.
What's next
We are working on more converters (TOML, MessagePack, Protocol Buffers), more code generators (Rust, Kotlin, Swift), and a small set of utilities for common JSON workflows (extracting a subtree, generating a synthetic payload from a schema). If there is a tool you wish existed, let us know — the next one might be yours.