JSON Formatter & Validator

Indent

Sort keys

Minify

JSON Input bytes

Formatted Output bytes

Input:

Output:

Saved:

Instant JSON formatting

Paste raw, minified, or broken JSON and get a clean, indented version in milliseconds. Supports 2 spaces, 4 spaces, or tab indentation.

Built-in syntax validator

Every keystroke is validated against the JSON spec. Syntax errors are highlighted immediately so you can fix them without guessing.

No data leaves your browser

All processing happens client-side in JavaScript. Your JSON is never sent to a server — perfect for sensitive API payloads and credentials.

Frequently asked questions about JSON formatting

Everything about pretty-printing, validation and best practices

Unformatted JSON is a single, often very long line that is almost impossible to read or debug. Formatted JSON adds indentation and line breaks so nested objects, arrays and key-value pairs become instantly visible. This saves time when reviewing API responses, config files or log data.

Two spaces are the de-facto standard in JavaScript projects and most style guides (Prettier, ESLint). Four spaces are common in Python (PEP 8) and Java ecosystems. Tab indentation keeps files compact and lets each developer set their preferred tab width in their editor. Pick the convention that matches your project's existing code style.

Sort keys reorders every object's properties alphabetically before formatting. This makes large JSON documents easier to scan because you can predict where a key appears. It also produces stable output: two JSON objects with the same data but different key orders will format to identical text, which is useful for diffing and version control.

Use Minify when you need the smallest possible payload for production: API responses, inline config, or JSON embedded in HTML. Minification strips all spaces and newlines, often reducing file size by 20–50 %. For development and debugging always use formatted JSON; only switch to minified output for the final build or deploy step.

Format, validate and sort JSON

The JSON formatter makes messy or minified JSON readable again in seconds: it indents cleanly, checks the syntax and points out errors with their position. That makes it a daily tool for developers who inspect API responses, edit configuration files or need to understand someone else's JSON. Processing happens entirely in the browser, so your data is never uploaded.

Common use cases

Read API responses: Turn a compact API response into indented JSON to grasp its structure and fields quickly.
Find syntax errors: Locate a missing comma or an unclosed bracket before the JSON crashes your application.
Sort keys: Order fields alphabetically to compare two JSON objects more easily.
Maintain configs: Edit package.json, tsconfig or other configuration files with correct formatting.

How to format your JSON

1 Paste your JSON into the input field or type it directly.
2 The tool formats and validates it instantly and reports any errors.
3 Adjust the indentation or sorting if you need to.
4 Copy the formatted result with one click.

More than just indenting

A good formatter is also a validator: it tells you whether your JSON is valid at all and points to the faulty spot – which saves a lot of searching. The sort function is especially useful when comparing versions or tidying up structures that have grown over time. Because everything happens locally in the browser, you can paste sensitive API data or tokens without worry, since they never go to a server.

Free tools that pair well with this one – right in your browser, no sign-up.

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