JSON Formatter & Validator
JSON Formatter & Validator formats, validates, minifies, and sorts standard JSON locally with line/column errors, Tab/2/4/8 indentation, desktop preview, and plain copy.
JSON Input
Characters
0 / 50,000
Quick Start
Common Scenarios
API debugging
quickly check whether returned JSON is valid and turn it into something easier to read.
Log inspection
format JSON snippets from logs to spot bracket, quote, and field-structure issues.
Configuration editing
clean up JSON structure, indentation, key order, and nested layout before saving.
Code review
include clearer JSON examples so teammates can inspect payloads and config changes faster.
Pre-commit check
normalize pasted JSON formatting and indentation to reduce style noise before commit.
Formatting Parameters & Actions
Standard JSON Boundaries
Usage Advice
Limitations & Compatibility
Privacy & Security
FAQ
Strict JSON requires double-quoted strings, no comments, no trailing commas, and no NaN or Infinity values. If your input is JavaScript object syntax or JSON 5-style content, normalize it to standard JSON before formatting or minifying.
Start from the reported line and column, then inspect nearby quotes, commas, brackets, and braces. Most JSON parse errors come from the token just before the highlighted position, not necessarily the highlighted character itself.
Use ‘Minify’ to remove all whitespace and newlines; prefer minified JSON for production transfer.