Format and Validate JSON Without Guessing Where It Broke
Turn compact JSON into readable structured output and isolate common syntax mistakes quickly.
Start with the right workflow
JSON is strict: property names require double quotes, trailing commas are not allowed, and every opening brace or bracket needs a matching close.
What to know, step 2
Paste the complete payload into the formatter before editing it. A successful result confirms valid syntax and exposes the structure through consistent indentation.
What to know, step 3
If formatting fails, inspect the area around the reported position. Common causes include single quotes, an extra comma after the final property, or an unescaped line break inside a string.
What to know, step 4
After correcting the syntax, format again and scan nested objects and arrays. Readable indentation often reveals values placed at the wrong level even when the JSON is technically valid.
Put it into practice
Formatting confirms syntax, not business meaning. Validate required fields and expected data types separately before sending the payload to an API.