Free Online JSON Formatter
A JSON formatter beautifies and validates JSON, producing indented output with syntax highlighting and inline error messages.
Your data is processed entirely in your browser and never sent to any server.
How to Use This Developer Tool
- Paste your JSON into the input area.
- The indented, syntax-highlighted output appears in the right panel.
- If parsing fails, read the error and approximate line number below the input.
- Switch indentation (2 spaces, 4 spaces, tabs) from the toolbar.
- Click Copy to send the pretty JSON to your clipboard.
What Is a JSON Formatter?
JSON (RFC 8259) is the wire format for nearly every modern web API, but a single-line response from `curl` or a webhook payload is impossible to scan by eye. A formatter restores indentation, balances brackets, and surfaces parse errors with line numbers so you can spot a missing comma immediately.
Reach for it when an API returns a one-line body, when a webhook arrives mangled in a log entry, or when you need to diff two responses by structure rather than whitespace. Toggle between 2-space, 4-space, and tab indentation to match the convention of the project you're pasting into.
The parser runs in your browser, so production tokens, PII, and auth payloads never leave the page.
Frequently Asked Questions
What does a JSON formatter do?
Is the JSON formatter free to use?
Does the formatter validate JSON?
References
Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.
Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.