JSON Analyzer

Validate JSON and inspect its structure, depth, keys, arrays, values, and size. The analyzer runs locally in your browser.

JSON input

Structure report

Paste JSON and run the analyzer.

Understand JSON Before You Use It

Use the analyzer when an API response, config file, import payload, or test fixture looks too large or nested to inspect by eye. It turns raw JSON into clear structure metrics.

Validate · Count · Inspect

Why Use This JSON Analyzer?

Fast Syntax Validation

Catch invalid JSON before it reaches an API request, app setting, build step, or import job.

Structure Counts

Count objects, arrays, keys, strings, numbers, booleans, null values, and total values.

Depth and Size Review

Check nesting depth, character count, and byte size to understand payload complexity.

Format and Copy

Format readable JSON, minify it for transfer, or copy the analysis report for debugging notes.

How this JSON Analyzer works

The JSON Analyzer validates your pasted JSON and then walks through the parsed structure to build a clear report. It counts objects, arrays, keys, strings, numbers, booleans, null values, total values, and maximum nesting depth. It also shows the root type, text size, byte size, and top-level keys when the root value is an object. This helps developers, analysts, and QA teams understand a payload before using it in an API, database import, configuration file, or debugging session. If the JSON is invalid, the tool shows the browser parser error so you can fix the syntax. You can also format readable JSON or minify it after a successful parse. All parsing runs in your browser, so the JSON text is not uploaded or stored by the site.

How to use this JSON Analyzer

Paste JSON

Add the JSON object, array, or value you want to inspect.

Run analyzer

Validate the syntax and review counts, depth, size, and top-level keys.

Format or minify

Clean up the JSON for reading or compress it for transfer and storage.

Example Usage

Analyzing a small API response before using it in code:

Input

{ "user": { "id": 42, "roles": ["admin", "editor"] }, "active": true }

Output

Valid JSON Root type: object Objects: 2 Arrays: 1 Max depth: 3

Frequently Asked Questions

What does a JSON analyzer do?

It validates JSON and summarizes its structure, including values, keys, objects, arrays, nesting depth, and text size.

Is my JSON uploaded to a server?

No. The JSON is parsed in your browser. This is useful when checking private API responses or configuration files.

Can this tool analyze a JSON array?

Yes. The root value can be an object, array, string, number, boolean, or null, as long as it is valid JSON.

What does max depth mean?

Max depth is the deepest level of nesting found in the JSON. Deep nesting can make payloads harder to read and maintain.

Why does my JavaScript object fail as JSON?

JSON is stricter than JavaScript objects. Keys must use double quotes, strings must use double quotes, and trailing commas are not allowed.

Can I format JSON with this analyzer?

Yes. After a valid parse, click Format to indent the JSON or Minify to remove extra whitespace.

Does it detect duplicate keys?

Standard JSON parsing keeps the last duplicate key, so this analyzer focuses on valid parsed structure rather than duplicate-key linting.

Why is byte size different from character count?

Some characters use more than one byte in UTF-8. Byte size is closer to the payload size sent over a network.

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The JSON Analyzer is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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