JSON Formatter & Validator

What is JSON Formatter & Validator?

A JSON formatter takes raw or minified JSON data and reformats it with proper indentation, syntax highlighting, and structure. It also validates the JSON against the specification, identifying syntax errors like missing brackets, trailing commas, or invalid escape sequences.

How to use this calculator

1. 1Paste your raw or minified JSON into the input area on the left.
2. 2Click Format to see the indented, structured output with syntax highlighting.
3. 3Review any validation errors highlighted with specific line numbers and descriptions.
4. 4Use the collapsible tree view to navigate large or deeply nested JSON structures.
5. 5Copy the formatted output for your documentation, debugging session, or code review.

Why this matters for founders

Developers work with JSON constantly -- API responses, configuration files, database records, log output. Unformatted JSON is nearly impossible to read or debug. A quick format-and-validate step saves minutes on every API integration or data debugging session.