JSON Formatter
Format, validate and minify JSON — with useful error messages.
About this tool
Paste JSON to pretty-print it with your chosen indentation, or minify it for transport. Invalid JSON gets a precise error with the line and position, so you can find the problem instead of hunting for it.
Everything is parsed by your browser's own JSON engine — nothing is sent to a server, so it is safe for data you would not paste into an online tool. Note that JSON has no comment syntax; if your file has comments it is likely JSON5 or JSONC and will fail to parse here.
Do this at scale with AI
This app handles the one-off job. These tools handle it as part of a real workflow.