Online JSON Viewer

This free JSON viewer helps you paste JSON and instantly see a readable, structured view. Use it as a JSON formatter (pretty print), a JSON validator (find syntax errors), and a JSON tree viewer (expand/collapse objects and arrays).

What you can do

Format JSON and keep indentation consistent
Validate JSON and locate parsing errors quickly
Switch between tree view and raw JSON output
Copy or download formatted JSON in one click

Generate JSON faster

Build JSON from fields when you don't have a sample yet
Use Faker.js presets to generate realistic fake data
Create test payloads for APIs, webhooks, and QA
Keep everything local in your browser (no account required)

FAQ

Is this JSON viewer free?

Yes. You can use this online JSON viewer to format, validate, and view JSON without signing up.

Can I pretty print JSON here?

Paste JSON into the editor and the formatter will pretty print JSON with clean indentation.

How do I validate JSON?

If the JSON is invalid, the JSON validator shows an error message so you can fix the syntax and try again.

Does it support multiple languages?

Yes. Use the language switcher in the top-right; no matter the UI language, you can format, validate, and view JSON with this JSON viewer.