JSON Formatter & Validator
Format, minify and validate JSON without sending the content to a server.
What this tool does
The formatter indents JSON to make nested objects easier to inspect, while the validator checks syntax such as quotes, commas, brackets and value types. Valid JSON can still fail an API or application schema, so treat syntax validation as the first check, not the last.
How to use it
Enter the values requested by the calculator and check the result together with the notes shown below it.
Practical example
Use a realistic example from your own setup to compare scenarios. The result is a reference, not a replacement for manufacturer specifications.
How to interpret the result
Treat the result as an estimate whenever real-world factors are not available to the browser. For hardware, network or safety decisions, verify the relevant technical specifications.
Frequently asked questions
Which errors does it detect?
It detects invalid JSON, such as trailing commas, single quotes or unclosed braces, and shows the browser’s error message.
Is my data sent to a server?
No. The JSON is processed in your browser. Even so, avoid pasting passwords or access keys into any online tool.