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JSON Formatter
Paste JSON text to validate syntax, pretty-print nested data, or minify JSON without uploading raw text or storing it in custom analytics.
Format JSON for debugging, validate pasted API responses, minify config snippets, and clean nested data before copying it into code or documentation.
Result
How it works
Paste only safe sample JSON
Use a harmless payload or sanitized fixture instead of production records, credentials, customer identifiers, or confidential API data.
Format before handoff
Pretty-print for review, minify for compact examples, and read the visible output and any large-number warning before committing, documenting, copying, or sending it to another tool.
Review large integer precision
JavaScript's safe integer range ends at ±9,007,199,254,740,991. Unquoted integer values outside this range may change while formatting, so compare the visible result with the source before copying it.
Validate with your real schema separately
This tool checks strict JSON syntax only. Required fields, types, enum values, business rules, and private API contracts still need your schema validator or test suite.
Examples
Pretty object
Input: {"name":"Ada","score":10}
Output: { "name": "Ada", "score": 10 }
API response
Input: {"data":[{"id":1,"status":"ok"}],"next":null}
Output: Indented response body for quick review
Config cleanup
Input: {"features":{"beta":true},"timeout":30}
Output: Readable config snippet to review before committing
Webhook payload
Input: {"event":"checkout.completed","created":1720000000}
Output: Formatted payload for documentation or debugging notes
Contract handoff
Input: {"request":{"id":"demo-1"},"response":{"ok":true}}
Output: Readable sample payload for a teammate to review before sharing
Minified JSON
Input: { "name": "Ada", "score": 10 }
Output: {"name":"Ada","score":10}
Boolean value
Input: {"active":true}
Output: { "active": true }
Null value
Input: {"middleName":null}
Output: { "middleName": null }
Four-space indent
Input: {"team":{"name":"SOLVEOZA"}}
Output: Nested JSON with four-space indentation
Syntax check
Input: {"name":"Ada"
Output: Validation message with a safe syntax position
FAQ
Does SOLVEOZA upload my JSON?
No. The JSON formatter runs in the browser tool flow and does not send raw JSON to a SOLVEOZA formatting server.
Does SOLVEOZA store object keys or values?
No. Custom analytics may record coarse tool events only, not raw JSON text, keys, values, filenames, or formatted output.
Can this validate JSON syntax?
Yes. If parsing fails, the tool returns a generic syntax message and position when available without echoing the private input.
Does this validate a schema?
No. It validates strict JSON syntax only. It does not check whether fields match an API contract, schema, or business rule.
Can large integers change while formatting?
Yes. JavaScript's built-in Number type cannot guarantee every integer outside -9,007,199,254,740,991 through 9,007,199,254,740,991. The tool warns when it finds an unquoted integer outside that safe range. Represent an identifier as a quoted value only when the receiving schema accepts strings.
Can I minify JSON?
Yes. Choose Minify mode to remove extra whitespace, then review the visible output and any large-number warning before copying it.
Can I choose indentation?
Yes. Pretty mode supports two-space and four-space indentation for common development and documentation workflows.
Does the error show line and column details?
Browser parser messages vary. When a safe position is available, the tool shows it, but exact line and column detail is not guaranteed.
Does it support JSON5, comments, or trailing commas?
No. This tool uses strict JSON parsing, so comments, trailing commas, unquoted keys, and JSON5-only syntax are rejected.
Can I format very large JSON text?
Not in this first browser-safe slice. JSON input is capped at 512 KiB, and formatted output is capped at 2 MiB, measured by UTF-8 byte size.
Should I paste secrets or credentials?
Avoid pasting API keys, tokens, credentials, regulated data, or confidential production data into any web tool unless your policy allows it. Remove secrets before sharing formatted output.