Formatting and Validating JSON
Paste JSON and the tool validates it as you type, pointing at the exact line and column when parsing fails - the fastest way to find a stray trailing comma or an unescaped quote in an API response. Formatting, minification and key sorting all run locally in your browser, so payloads with real data never leave your machine.
Two habits save most JSON debugging time: format responses before trying to read them, and validate config files before deploying them. When you need to see what changed between two payloads, the JSON Diff tool compares them structurally instead of line by line. For config work, JSON converts cleanly to YAML and back, and spreadsheet exports convert from CSV to JSON. If the JSON you are inspecting is the payload of an access token, decode it with the JWT decoder instead - it splits the header and claims for you.