JSON Formatter
Use the fields above to transform, validate, or format input. Errors appear in the on-page alert when parsing fails.
Format JSON
How it works
Parsing and encoding run entirely in JavaScript here—no server sees your pasted content unless a tool explicitly says it fetches remote data.
Common errors
- Trailing commas after the last object/array item are invalid JSON.
- Keys and string values must use double quotes, not single quotes.
- Comments (`//` or `/* */`) are not part of standard JSON.
Use this tool for
- Formatting or minifying snippets before pasting into a repo or ticket.
- Checking encodings (Base64, hex, URL) without third-party paste services.
- One-off developer checks during debugging.
Common questions
Which inputs matter most for JSON Formatter?
Use the fields this page exposes for your task—usually the main text/box or mode selector—and any option that changes parsing rules.
