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JSON
Formatter
Validator
Developer Workflow
JSON Formatter
Validate, format, minify, sort keys, and copy JSON directly in the browser. Useful for API debugging, config review, and log cleanup.
Surface line and column details on invalid input so issues are faster to debug.
Inspect root type, key counts, array size, node totals, and character count at a glance.
Input
Raw JSON
Output
Formatted output
Waiting for input. Objects, arrays, and standard JSON primitives are supported.
Preview
Syntax-highlighted preview
Tree
Structure tree
Developer Tools
About JSON Formatter
JSON Formatter parses standard JSON, reports invalid input with a line and column, and can format, minify, or sort object keys. Use it to inspect an API payload or configuration copy before it reaches another system.
Reference: JSON data interchange format (RFC 8259)
01
How to use it
- Paste a JSON value, object, or array; do not paste credentials or production secrets.
- Choose formatting, minifying, validation, or key sorting, then read any line-and-column error before editing the source.
- Copy the result and validate it again in the destination API, runtime, or configuration loader.
02
Frequently asked questions
Which JSON syntax can JSON Formatter validate?
It is intended for standard JSON values, arrays, and objects. Comments, trailing commas, and unquoted property names are not valid JSON.
Does formatting change JSON data?
Whitespace changes do not change a valid JSON value. Sorting keys changes object member order, so use it only when that ordering is not meaningful to the receiving system.
How should I interpret a JSON error location?
Use the reported line and column to find the first parsing failure. A later-looking character can be caused by an earlier missing quote, comma, or closing bracket.
03
Input, output, and validation
Paste or enter technical content, run the tool, and use the output to support debugging, formatting, or data exchange. For structured data, also verify syntax, field types, encoding, and the destination system's constraints.
Example check: start with a minimal sample that contains no keys, tokens, or production data. Verify the structure and result, then apply the same rule to a working copy.