JSON Tools
Format, validate, and convert JSON — nothing leaves your browser.
Paste messy or minified JSON to instantly format, validate, and convert it to CSV or YAML — useful for debugging API responses, preparing spreadsheet exports, or writing Kubernetes and CI config files. Parsing and conversion both run with your browser's native JSON engine, so nothing you paste is ever sent to a server.
How to use this tool
- 1Paste or type your JSON into the Input box on the left.
- 2It's validated and pretty-printed automatically as you type — invalid JSON shows an error with a description of what's wrong.
- 3Click Minify to collapse the input to a single compact line, or Copy to grab the formatted output.
Frequently asked questions
What does the error message tell me?
It shows the underlying JavaScript JSON.parse error, which usually points to the type of problem (e.g. an unexpected token) and its position in the string.
What's the difference between Format and Minify?
Formatting adds indentation and line breaks for readability; Minify does the opposite, stripping all whitespace to produce the smallest possible valid JSON string.
Is my JSON uploaded to a server to validate it?
No — parsing and formatting use the browser's built-in JSON.parse/stringify, so your data never leaves your device.