JWT Decoder
Decode JWT header and payload locally without verifying or uploading the token.
Developer
Free JSON Formatter & Validator
Format, validate and pretty-print JSON locally in your browser without uploading the payload to a server.
Your input is processed only as required by this tool.
Free JSON Formatter & Validator
Readable JSON is easier to debug, review and share during development. This formatter parses the value you provide and outputs normalized, indented JSON entirely in the browser, so API payloads, configuration fragments and sample data do not need to leave your device.
How to use it
- Enter the value you want to process.
- Choose the available options for the output you need.
- Generate the result locally in your browser, then copy or use it without uploading the input to Ciatto Tools.
How to read the result
A successful result means the input is syntactically valid JSON. Formatting does not validate your application's business schema, required fields or value semantics; it only proves that the document can be parsed as JSON.
Limitations
Very large documents can consume browser memory and may be better handled with streaming or command-line tooling. Never paste secrets into online tools unless you understand how they process data; this formatter is intentionally local-first.
Frequently asked questions
Does my JSON get uploaded?
No. The current formatter runs in your browser and does not need to send the JSON payload to the Ciatto Tools API.
What is the difference between formatting and validating JSON?
Parsing confirms that the text follows JSON syntax. Pretty-printing then renders the parsed value with consistent indentation. Neither step validates an application-specific JSON schema.