Free JSON Formatter & Validator

Format, minify, and validate JSON with syntax highlighting and error detection. Paste your JSON and get instant results — no signup required.

Paste your JSON

How to format JSON

Paste your JSON. Copy raw or minified JSON from an API response, config file, or log and paste it into the input area.
Click Format. Press Format to indent the JSON and run validation. Errors are highlighted with line numbers, and stats show key counts, depth, and size.
Copy the formatted output. Click Copy to grab the beautified JSON, or Minify to strip whitespace for compact transport.

What is JSON formatting?

JSON (JavaScript Object Notation) is a lightweight data format used to exchange data between servers and web applications. Raw JSON from APIs or databases is often minified — stripped of whitespace and newlines — making it nearly impossible to read.

A JSON formatter (or "beautifier") adds proper indentation and line breaks so you can quickly understand the structure. Conversely, minifying removes all unnecessary whitespace to reduce payload size — useful when sending data over the network.

When is this useful?

Debugging API responses

Paste a raw API response to see its structure clearly, identify missing fields, or find unexpected values.

Validating configuration files

Check that your JSON config files (package.json, tsconfig.json, etc.) are valid before deploying.

Sharing data with teammates

Format JSON before pasting into Slack, docs, or tickets so others can read it instantly.

Optimizing payloads

Minify JSON before sending it in API requests or storing it to reduce bandwidth and storage costs.

Learning JSON structure

See key counts, nesting depth, and size at a glance — helpful when exploring unfamiliar APIs.

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