How to use the JSON Viewer
- Paste your JSON or open a file.
- The view updates automatically.
- Expand and collapse nodes to explore the structure.
About JSON
JSON (JavaScript Object Notation) is the default data format of web APIs, package manifests and most configuration tooling. It supports objects, arrays, strings, numbers, booleans and null.
Private by design
Developer data is often sensitive: API responses, tokens, customer records, internal configs. This JSON Viewer processes everything locally in your browser tab. There is no server round-trip, no logging and no storage of your input.
Frequently asked questions
Is this JSON Viewer free?
Yes. This JSON Viewer is completely free to use with no sign-up, no limits and no ads inside the tool.
Is my data uploaded to a server?
No. The JSON Viewer runs entirely in your browser using JavaScript. Nothing you paste is sent to DevT Pro or any other server.
Can I use the JSON Viewer offline?
Yes. JSON Viewer is also built into DevT Pro, a native app for Mac, Windows, iPad and Linux with 120+ developer tools that work fully offline. It is a $5.99 one-time purchase with no subscription.
