jsonpost

About JSONPost

JSONPost is a free collection of 60 tools for working with JSON — formatting, validation, conversion, code generation, schema tooling, comparison, and everyday utilities. There are no accounts, no paywalls, and no limits. Open a tool, paste your data, and get your result in milliseconds.

Why we built it

Developers reach for JSON dozens of times a day — debugging an API response, reshaping a config file, generating types, or checking why a payload won't parse. Most online tools that help with this upload your data to a server, bury the feature you need under ads, or ask you to sign up. We wanted the opposite: a fast, focused, privacy-respecting toolbox that does one thing well and gets out of your way.

Privacy first

Every tool runs entirely in your browser. Your data is processed locally with JavaScript and is never uploaded to, stored on, or logged by a server. That makes JSONPost safe to use with private API responses, access tokens, customer records, and other production data. When you close the tab, nothing is left behind on our end. You can read the details in our privacy policy.

Fast and free

Because the tools run client-side, results are instant and there are no per-request costs to pass on to you. There's nothing to install and nothing to configure. Bookmark the tools you use most, or press ⌘K anywhere on the site to jump straight to the one you need.

What's inside

The catalog is organized into six categories so you can find the right tool quickly:

  • Formatting & validation — beautify, minify, validate, repair, and explore JSON.
  • Converters — move between JSON and CSV, XML, YAML, Excel, Base64, query strings, and more.
  • Code generation — turn sample JSON into TypeScript, Go, Python, Java, C#, Swift, and other languages.
  • JSON Schema — generate, validate, document, and mock data against a schema.
  • Comparison & manipulation — diff, merge, query with JSONPath or jq, flatten, and transform.
  • Generators & utilities — mock data, JWT decoding, size analysis, GeoJSON, and more.

How it's built

JSONPost is a static, browser-first web app. There is no database and no user data on the backend — the tools are plain JavaScript that executes on your device. We keep the interface clean, support light and dark modes, and work to make the site fast on every screen size.

Explore

Browse the full tool catalog or read the blog for practical guides on JSONPath, jq, JSON Schema, TypeScript generation, and more.

Contact

Have feedback, found a bug, or want to suggest a tool? We'd love to hear from you at directoryops@gmail.com.