JSON 포맷터 온라인 도구
구문 강조 및 오류 프롬프트로 JSON 데이터를 포맷팅, 검증 및 미화합니다
💡 팁: 중첩된 JSON 문자열을 포함하여 JSON 문자열 형식의 자동 구문 분석을 지원합니다. 예:
- 쌍따옴표 형식:
"{\"name\":\"John\"}" - 작은따옴표 형식:
'{"name":"John"}' - 중첩된 JSON 문자열:
{"data":"{\"age\":30}"}자동으로 구문 분석됩니다{"data":{"age":30}}
JSON 입력
포맷팅 결과
구문 검증
상세한 오류 정보 및 위치 프롬프트가 있는 실시간 JSON 구문 오류 검사
포맷팅 및 미화
더 나은 가독성을 위해 사용자 정의 가능한 들여쓰기 크기로 JSON 데이터 자동 포맷팅
원클릭 내보내기
클립보드 복사 및 파일 다운로드를 지원하여 결과를 쉽게 저장하고 공유
JSON Formatting, Validation, and Debugging Guide
JSON problems usually appear during API debugging, log inspection, and configuration migration. FormaX parses input in the browser, produces a readable result, and keeps the original text when syntax errors need investigation.
Use it for API responses, webhook payloads, exported configuration, and escaped JSON strings from logs. Formatting does not upload the payload to a server.
Common Use Cases
- REST API debugging: inspect nested response structures and locate missing brackets or trailing commas.
- Log analysis: extract and format JSON fragments from ELK, CloudWatch, or local log files.
- Configuration editing: beautify package.json, tsconfig.json, Docker Compose, and similar config files.
- Webhook debugging: inspect callback payloads from Stripe, GitHub, Slack, and other platforms.
- Low-code exports: clean up exported JSON configuration for version diffing and code review.
Recommended Workflow
- Paste the raw JSON or response body and check whether the validity indicator is green.
- If the text comes from logs, remove timestamps, request IDs, and outer quotes before formatting.
- Choose 2 or 4 spaces according to your codebase or documentation style.
- Before copying, verify array sizes, field casing, and null values so debug data does not leak into configuration.
Debugging Example
{"user":{"id":42,"roles":["admin","editor"]},"enabled":true}Notes
- JSON requires double-quoted object keys; single quotes and trailing commas are not valid JSON.
- This tool validates syntax, not business rules such as required fields or enum values.
- For very large JSON files, inspect a representative slice first, then process the full file locally.
FAQ
Why does the API still fail after JSON formatting succeeds?
Formatting only proves the JSON syntax is valid. The API may still require specific types, enum values, required fields, or date formats.
Can I paste sensitive data?
Formatting runs locally in the browser, but avoid handling secrets, tokens, or production user data on shared machines or screens.
What is the difference between JSON and JavaScript object literals?
JSON is a strict data format with double-quoted keys and no comments, functions, or undefined. JavaScript object literals are more permissive and are not valid JSON as-is.
How do I find the exact location of a JSON syntax error?
The tool reports line and column numbers. Common causes include missing commas, trailing commas, unclosed brackets, and unescaped quotes inside strings.
Should I use 2-space or 4-space indentation?
Both are valid. Match your team convention. Frontend projects often use 2 spaces; some backend and Java ecosystems prefer 4.
What is the difference between minify and format?
Formatting adds indentation and line breaks for readability. Minifying removes whitespace to reduce size. Neither changes the data semantics.
Can I format JSON with Unicode or emoji?
Yes. JSON natively supports Unicode, and the tool preserves emoji and multilingual characters without corrupting encoding.
Is formatted JSON safe to use in production?
Valid syntax does not mean valid business data. Always verify field completeness, types, and business rules in a test environment before deploying.