Developer tools
JSON Formatter
Format and pretty-print JSON with readable indentation. No signup required.
- Free to use · no account required
- Processes input in your browser
- Review and copy your results
Enter your details
Step by step
How to use JSON Formatter
Prepare your input
Paste valid JSON, including quoted property names and correctly placed commas.
Run the tool
Select Calculate / Convert to parse and indent the JSON.
Check and use the result
Copy the formatted result. Fix the reported syntax issue if parsing fails.
How this tool works
Enter your input above, select Calculate / Convert, and copy the result if needed. This tool runs in your browser. No input is intentionally uploaded to ToolTama by the tool.
Good to know
Frequently asked questions
Can it format JavaScript objects with comments?
JSON syntax does not allow comments, trailing commas or unquoted property names. Convert the input to valid JSON first.
Is JSON Formatter free?
Yes. This public tool does not require an account, payment or subscription.
Where is my input processed?
The tool-specific processing runs in your browser. Website delivery still involves hosting requests; see the privacy policy for details. Read the privacy policy.
How do I pretty print JSON?
Paste the JSON and choose Calculate / Convert. It is re-printed with 2-space indentation and one key per line, ready to copy into your editor, docs or a support ticket.
Why do I get an error?
The JSON is not valid. Common causes are trailing commas, single quotes instead of double quotes, comments, or unquoted keys. The error message from your browser points to the problem. Check it with the JSON validator.
Is it safe to paste API responses with tokens?
The formatting runs in your browser and nothing is sent to ToolTama. Still, remove secrets you don’t need before sharing formatted output with anyone.
Why use this tool
JSON beautifier for API responses and config files
Minified JSON from APIs, logs and webhooks is hard to read. Formatting it makes nested objects and arrays clear so you can spot missing fields, wrong types and broken values faster. The format follows the JSON standard.
Your privacy: Your data is formatted in your browser and never sent to ToolTama.
Related: JSON validator, JSON minifier, JSON-LD validator, Base64 decode.