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입력 JSON

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서식 JSON

포맷 된 JSON이 여기에 나타납니다

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JSON 포매터 & 검증기 - 온라인 JSON 도구

JSON (JavaScript Object Notation) is the most widely used data exchange format for REST APIs, microservices, configuration files, and logs. A reliable online JSON formatter and validator helps you pretty‑print complex objects, spot syntax errors fast, and convert between human‑readable and minified representations. Use this JSON beautifier when preparing documentation, debugging malformed payloads, or collaborating on API contracts across teams.

What JSON looks like (objects, arrays, and primitives)

JSON represents data using a small set of types: objects (key:value pairs inside { }), arrays (ordered lists inside [ ]), strings, numbers, booleans, and null. Keys are quoted strings and values can be nested arbitrarily. Example: { "id": 101, "name": "Ada Lovelace", "skills": ["math", "programming"], "active": true, "meta": { "twitter": "@ada" } }. A formatter reflows this into consistent indentation and stable key ordering (when applicable) so diffs are clean and reviews stay focused on actual changes.

Common mistakes the validator catches

When editing JSON by hand, tiny syntax issues break parsers: trailing commas, unquoted keys, single quotes instead of double quotes, or comments accidentally pasted from code. This JSON validator pinpoints errors with line and column numbers, highlights the failing token, and offers hints to fix escaping for special characters (for example, embedded " quotes or newlines).

Real‑world use cases: API payloads and configuration

Use the online JSON formatter to: (1) inspect API responses from curl or Postman, (2) clean and present examples in READMEs and OpenAPI docs, (3) normalize configuration files (package.json, tsconfig.json, ESLint/Prettier configs), and (4) minify JSON to reduce payload size in web apps or CDNs. Pretty‑printing improves readability; minification saves bytes in transit and on disk.

Step‑by‑step: from raw text to clean, minified JSON

Paste raw JSON, click Format to beautify with consistent indentation, verify keys and types, then copy or download the result for sharing. Switch to Minify to strip whitespace for production delivery. If you need structural validation, pair with JSON Schema to enforce required properties, enums, formats (email, uri, date‑time), and type constraints across environments.

Tips for clean diffs and stable documentation

Keep keys consistently ordered where possible, avoid insignificant whitespace churn in version control, and include small realistic examples in documentation so teammates can copy/paste and reproduce. When serializing, prefer UTF‑8 and use explicit encoders to avoid locale pitfalls. For very large objects, consider streaming or chunking to keep the browser responsive.

Further reading

A dependable JSON formatter and validator is essential for clean API design and maintainable configuration. Use pretty‑print for readability, minify for performance, and add JSON Schema for structural guarantees in CI and runtime.