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Browser-based tool

JSON Formatter

Beautify raw JSON with stable two-space indentation for easier reading, review, and debugging.

FAQ

Is this JSON tool free?

Yes. It is free to use, and it runs right in the browser.

Is my JSON uploaded anywhere?

No. Your JSON stays in the page. Formatting, validation, comparison, and conversion all happen locally.

How do I fix invalid JSON?

Start with the common mistakes: trailing commas, missing quotes, or a bracket that never got closed.

Can I format large JSON files?

Usually yes. If the payload is very large, the limit is your browser tab more than the formatter itself.

How To Use It

When to format JSON

Pretty-printed JSON is easier to scan when a payload lands in a bug report, PR, or API doc.

It also makes nested objects, arrays, and missing fields much easier to spot.

How to fix invalid JSON before formatting

If formatting fails, the problem is usually a trailing comma, a missing quote, or a copied JavaScript object that is not valid JSON.

When the input came from logs or a hand-edited file, validate it first and format it second.

Related Tools

JSON Validator

Check JSON syntax and catch parser errors before the payload goes any further.
JSON Minify

Strip whitespace from JSON when you need a compact payload.
JSON Compare

Compare two JSON documents and see which keys, values, or array items changed.

Related Tutorials

How to Format JSON: A Practical Developer Guide

Learn how to format JSON for readability, common use cases, and step-by-step examples with real-world scenarios.
JSON Best Practices for Developers

Battle-tested tips and best practices for working with JSON in APIs, config files, and data exchange from years of production experience.
Good to know

Runs in your browser

Paste your input at the top and the result shows up right below. The FAQ and related tutorials are there if you want more.

  • Most tools run entirely in your browser.
  • Your input isn't sent to a server unless a tool says it makes a network request.
  • Related tools and tutorials sit below when a task usually needs a follow-up.