Free JSON Viewer Online – Pretty Print JSON Instantly

JSON Input

Pretty JSON

What is a JSON Viewer?

You know that moment when you copy a JSON response from an API and it's just one long, unreadable line? That's what a JSON Viewer fixes. Paste your raw or minified JSON and it instantly renders in a clean, indented format with syntax highlighting — making it easy to scan, read, and understand. JSON is defined in RFC 8259 and is used everywhere from REST APIs to config files. This viewer helps you actually read it.

This viewer uses 2-space indentation and syntax highlighting to make even deeply nested JSON structures easy to read and understand. If you want to learn more about the format itself, Wikipedia's JSON article has a solid overview, and the MDN JSON reference covers all built-in browser methods.

How to Use

Paste your JSON

Paste raw, minified, or already-formatted JSON into the left editor panel.

View the result

The right panel automatically pretty-prints your JSON with 2-space indentation. If the JSON is invalid, an error message is shown.

Copy or Download

Use the Copy or Download button to save the formatted output.

Example

Example: View a nested API response

JSON input:

{
  "user": {
    "id": 1,
    "name": "Alice",
    "email": "[email protected]",
    "roles": ["admin", "editor"],
    "address": {
      "city": "Berlin",
      "country": "Germany"
    }
  }
}

Tree view (collapsed):

user
├─ id: 1
├─ name: "Alice"
├─ address
│  ├─ city: "London"
│  └─ country: "UK"
└─ roles: ["admin", "editor"]

Frequently Asked Questions

How do I pretty print JSON online for free?

Just paste your JSON into the input panel on this page. The viewer automatically pretty-prints it with 2-space indentation and syntax highlighting — no signup, no install.

Can I use this JSON viewer to read API responses?

Absolutely. Copy the raw JSON from your API response, paste it in, and you'll immediately see a clean, readable version. Great for debugging REST APIs or inspecting webhook payloads.

Does this tool send my JSON to a server?

No. Everything runs entirely in your browser. Your JSON data never leaves your machine — which makes this safe for sensitive data like API tokens or user records.

Can this viewer handle large JSON files?

It handles most everyday JSON files well — API responses, config files, logs. If you're working with a very large file (several MB+), the browser may slow down a bit, but the tool will still process it. For huge datasets, consider minifying first with the JSON Minifier to reduce size before viewing.