Developer Tools

JSON Viewer

View and format JSON data with syntax highlighting.

Indent:

JSON Input

Formatted Output

How to use the JSON Viewer

Paste JSON

Enter or paste your JSON data.

Format

Click Format to prettify the JSON.

Copy result

Click Copy to save formatted JSON.

What is a JSON Viewer?

A JSON viewer displays raw JSON in a structured, readable layout so you can understand data at a glance. Instead of scanning one long minified line, you see properly indented objects and arrays with the hierarchy laid out clearly.

Paste any JSON to view and validate it instantly. The viewer reports syntax errors with their exact position, counts the keys in your document, and lets you choose the indentation style. Everything runs locally in your browser, so API responses containing sensitive data stay on your machine.

Clean, indented view of any JSON document
Instant validation with precise error positions
Key count and structure feedback on valid JSON
Choice of 2 space, 4 space, or tab indentation
One click copy of the formatted output
Local processing, nothing is uploaded

Reading nested JSON structures

Real world JSON is deeply nested: objects inside arrays inside objects. A viewer makes the nesting visible through indentation, so you can trace exactly where a field lives, like data.users[3].address.city. That path is what you need when writing code to access the value, and seeing the structure laid out makes it obvious.

Viewing API responses safely

API responses often contain access tokens, emails, and internal IDs. Pasting them into a tool that uploads data to a server is a risk many teams prohibit. This viewer parses everything locally in your browser, so inspecting production data does not mean sharing it.

JSON viewer or JSON formatter?

The two overlap heavily. A viewer focuses on making data readable and explorable, while a formatter focuses on producing clean output text. This tool does both: it validates and displays your JSON, and gives you formatted text you can copy back into your editor or documentation.

Frequently Asked Questions

What does the JSON viewer do?

It parses your JSON, validates the syntax, and displays it with clean indentation so the structure is easy to read. Errors are reported with their exact position.

Is it safe to paste API responses with sensitive data?

Yes. The viewer runs entirely in your browser. Your JSON is never uploaded, logged, or stored on any server.

How do I find where a field lives in nested JSON?

Format the JSON and follow the indentation. Each level of nesting is one indent step, which maps directly to the path you would use in code, like user.profile.avatarUrl.

Why is my JSON showing as invalid?

The most common causes are trailing commas, single quotes instead of double quotes, and unquoted keys. The error message points to the position of the first problem.

Can I change the indentation of the output?

Yes. Choose 2 spaces, 4 spaces, or tabs before formatting, and the output follows that style.

Does it work with very large JSON files?

Yes. The viewer handles large API responses and exports smoothly because all processing is local.

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What is a JSON Viewer?

Clean, indented view of any JSON document

Instant validation with precise error positions

Key count and structure feedback on valid JSON

Choice of 2 space, 4 space, or tab indentation

One click copy of the formatted output

Local processing, nothing is uploaded