JSON Formatter & Validator

The JSON Formatter takes JSON data — usually a dense single-line blob from an API response or a log — and gives you three actions. 'Format' re-indents it with 2 spaces per level so the structure becomes readable. 'Minify' does the opposite, stripping all whitespace for the smallest possible payload. 'Validate' parses the data and tells you whether it's legal JSON.

Because every action runs the text through a real JSON parser, malformed input never fails silently: a trailing comma, a missing quote, or a single-quoted string produces an error message rather than mangled output.

Your data stays in your browser — relevant, because JSON pasted into formatters is very often production API data that shouldn't travel to a third-party server.

APIs return minified JSON, and humans can't read minified JSON. When you're debugging why a response field is missing or wrongly nested, formatting the blob is step one — a 3,000-character line becomes an indented tree where the problem is visible in seconds.

Validation catches the classic hand-editing mistakes. JSON is stricter than JavaScript: no trailing commas, no single quotes, no comments, and all keys must be double-quoted. Editing a config file by hand and validating it here before deploying saves a broken build later.

Minification matters at the other end of the workflow: JSON embedded in a web page or stored in a size-limited field benefits from shedding all its whitespace, which for a large indented file can easily cut the size by a third.

1. Paste your JSON into the input box.

2. Click 'Format' to prettify, 'Minify' to compress, or 'Validate' to check syntax.

3. If the JSON is invalid, read the error and fix the input — the most common culprits are trailing commas and single quotes.

4. Copy or download the result.

Input:

{"user":{"id":101,"active":true}}

Output (Format):

{ "user": { "id": 101, "active": true } }