Developer

JSON Formatter/Validator

Use a JSON formatter/validator to pretty print JSON, validate syntax, and minify JSON in the browser.

JSON source

Paste JSON from an API, config file, or document and validate it before you copy the result.

Formatted JSON

The output updates live so you can validate syntax, format nested objects, and trim the result when needed.

Status
Valid JSON
Mode
Pretty
Indent
2 spaces
Output

Why use a JSON formatter validator

A JSON formatter validator helps when you need to inspect API responses, config files, or pasted data without manually reformatting the structure. It turns raw JSON into readable output and flags invalid syntax in the browser.

That makes this page useful for developers, testers, and content teams who search for JSON formatter, JSON validator, or format JSON online and want the tool itself to stay front and center.

Pretty print JSON or minify it

Pretty print JSON when you want to inspect nested data, compare objects, or debug API payloads. Minify JSON when you need a compact string for transport, copy-paste work, or a smaller snippet in a test fixture.

Both options are useful because different workflows need different levels of spacing. A good JSON checker should make the formatting choice obvious and keep the output easy to copy.

When to validate JSON online

Validate JSON online when you are checking a response body, a copied document, or a config value and want a fast syntax check before moving on. The page can catch structural issues such as missing commas, stray quotes, and mismatched brackets.

That is especially useful during quick debugging sessions where you want a JSON viewer and formatter in the same place instead of switching between a text editor and a separate parser.

FAQ

What does this JSON formatter validator do?

It validates JSON syntax, pretty prints valid JSON, and can minify JSON when you need a compact string.

Can I use it as a JSON checker?

Yes. If the source is invalid, the page shows a parse error so you can fix the JSON before using it elsewhere.

Is the formatting done locally?

Yes. The JSON is parsed and reformatted in the browser without sending it to a server.

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