FormatPaste
JSON Formatter
Paste JSON, format it instantly, then copy clean pretty-printed output.
Output
formattedFree JSON formatter
Format JSON online without extra steps
Use this JSON formatter when you need to quickly clean messy JSON, pretty print a compact API response, format copied configuration, or remove paste artifacts before sharing data. Paste your JSON on the left and copy formatted JSON from the right.
Pretty print JSON
Turn minified or messy JSON into readable indented JSON with clean spacing.
Fix paste artifacts
Clean common copied-code problems before formatting, including fences and accidental line numbers.
Copy formatted JSON
Format, review, and copy output in one screen without navigating to another tool.
How this JSON formatter helps
Before and after formatting
Paste compact, copied, or hard-to-read JSON into the input pane. FormatPaste cleans common paste artifacts first, then formats the code into readable output that is easier to scan, debug, share, or copy into your editor.
Common JSON formatting use cases
Use it for quick snippets from documentation, AI chat output, Stack Overflow answers, config examples, API responses, old files, minified blocks, and code that picked up line numbers or markdown fences while being copied.
Safe paste reminder
FormatPaste is built for speed, but you should avoid pasting passwords, API keys, tokens, private keys, recovery codes, customer data, or other secrets into any online formatter. Use local tools for sensitive code.
JSON formatting example
{"id":42,"name":"Ada","roles":["admin","editor"],"active":true,"profile":{"city":"Berlin","tz":"Europe/Berlin"}}{
"id": 42,
"name": "Ada",
"roles": ["admin", "editor"],
"active": true,
"profile": { "city": "Berlin", "tz": "Europe/Berlin" }
}When to use a JSON formatter
Pretty print API responses
Responses copied from browser DevTools, curl, Postman, or server logs usually arrive as one long line. Paste the response here to see the nesting, spot missing fields, and compare payloads before you write parsing code.
Validate JSON while you format
The formatter parses your input as strict JSON. If something is wrong, you get an error instead of output, which makes it a quick JSON validator for config files, fixtures, and request bodies.
Common JSON mistakes to fix
Trailing commas after the last item, single quotes instead of double quotes, unquoted keys, and // comments are valid in JavaScript but not in JSON. Remove them and the formatter will accept the input.
JSON formatter vs JSON minifier
Formatting adds indentation and line breaks so humans can read the data. Minifying removes them so the payload is smaller. Use formatted JSON while debugging and reviewing, and minified JSON when size on the wire matters.
More free online formatters
JSON Formatter FAQ
How do I format JSON online?
Paste JSON into the input box. FormatPaste formats it automatically and shows copy-ready output on the right.
Is this JSON formatter free?
Yes. The JSON formatter is free and designed for quick paste, format, copy workflows.
Does this JSON formatter validate JSON?
If the JSON is invalid, the formatter returns a parser error instead of silently changing the data.
Can I format minified JSON?
Yes. Paste compact JSON and it will be pretty printed with readable indentation.
Why does my JSON show a parse error?
The most common causes are trailing commas, single-quoted strings, unquoted keys, comments, and a missing closing bracket. JSON is stricter than JavaScript object syntax, so code copied from a JS file often needs those fixes first.
What indentation does the JSON formatter use?
Output uses two-space indentation. Short arrays and small objects that fit on one line stay on one line, so the result stays compact without becoming hard to read.
Does formatting change my JSON data?
No. Formatting only changes whitespace. Keys, values, key order, and number precision are kept exactly as you pasted them.