JSON formatter for API payloads, logs and configuration files

What is JSON Formatter?

A JSON formatter indents and validates structured JSON so objects, arrays and fields are easier to read and debug.

Main use case: Format a raw JSON payload, validate syntax, inspect API responses or prepare readable configuration examples.

Common use cases

API response debugging

Indent compact payloads returned by APIs or webhooks.

Configuration review

Check JSON files before using them in apps or scripts.

Documentation

Prepare readable examples for technical docs.

How to use the tool

1. Paste raw JSON into the input.
2. Choose the format mode.
3. Check the status message for syntax errors.
4. Copy the formatted output.

Best practices

• Use realistic test values when validating forms, exports or API payloads.
• Keep real customer, banking and production secrets out of public tools.
• Check the output format before copying it into a production workflow.
• Document whether a value is generated, validated, converted or only estimated.

Common mistakes

Confusing valid format with real-world validity

A generated or locally validated value can match a format without proving that it exists in an official system.

Using real production data

Public utilities are best for test data, demos, fixtures, QA and quick checks, not for confidential values.