JSON Formatter

What is a JSON Formatter?

A JSON Formatter converts raw JSON into formatted, readable output. Paste your JSON on the left, click Format, and get indented, color-coded, line-numbered output on the right. The Minify option compresses JSON to a single line to reduce size.

Why is formatting important?

API responses often arrive as unreadable one-line data. When objects nest inside objects and arrays inside arrays, it is hard to tell which field belongs to which structure. Formatting separates levels with indentation and visually distinguishes keys from values, so you can quickly spot errors or missing fields.

How does error checking work?

Pasting invalid JSON shows a red error message. The browser's parser reports the approximate location and cause — a missing comma, a wrong quote or an extra brace — so you find the problem in large data sets within seconds.

When is it used?

• Making API responses readable while inspecting and testing.
• Validating syntax when editing config files like package.json.
• Minifying JSON to shrink transport and cache size.
• Generating and checking sample data while writing scripts.

Is my data safe?

Yes. Parsing and formatting happen entirely in your browser; your JSON is never sent or stored. Even configs containing API keys can be formatted safely.

How to use JSON Formatter

Format your JSON, validate its syntax and show errors — all with clean highlighting.

Use the controls above to provide your input or choose options, then review the result on the page.

Why use our JSON Formatter

• Formats, validates and prettifies JSON code; reports syntax errors with line numbers.
• Complete the task with a focused JSON Formatter workflow instead of switching between apps.
• Open it in your browser and get started—no account or installation required.