Developer ToolsFree · Testing phase
JSON Formatter and Validator
Format, minify and check JSON without sending it away.
Workspace
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Your inputs stay in this page. Only the tool name is sent to record a successful use. No account needed.
Common questions
What JSON values work?
Objects, arrays, strings, numbers, booleans and null are valid. Keys and strings need double quotes; comments and trailing commas are not JSON.
Does formatting change my data?
JavaScript parsing can round numbers beyond its safe precision and normalize duplicate keys. Do not use this tool to preserve very large numeric identifiers or duplicate keys.