JSON dogrulayici kullanimi

JSON (JavaScript Object Notation) is the most used data exchange format on the web. APIs, config files, NoSQL databases — all use JSON. A single syntax error (a missing comma, an unclosed quote) can break your entire application.

Common errors:

• Trailing comma: {"a": 1, "b": 2,} — invalid
• Single quotes: {'key': 'value'} — invalid (JSON only accepts double quotes)
• Unquoted keys: {key: "value"} — invalid
• Trailing commas in arrays: [1, 2, 3,] — invalid

Validate your JSON instantly with the free NexTools JSON validator.

Using the NexTools validator:

Step 1: Paste your JSON in the editor.

Step 2: Validator instantly shows if valid or invalid.

Step 3: If there's an error, it indicates the exact line and error type.

Step 4: Use the "Format" button to properly indent the JSON.

Additional features: Minify (remove whitespace), copy to clipboard, download as .json file.

Everything processed in your browser. No data leaves your computer.

1. Trailing comma. {"a":1, "b":2,} → remove the last comma. JavaScript allows it but standard JSON doesn't.

2. Single quotes. {'key': 'val'} → use double quotes: {"key": "val"}.

3. Comments. {"a": 1 // comment} → JSON doesn't support comments. Use JSONC or JSON5 if needed.

4. NaN/Infinity. {"value": NaN} → invalid. Use null or a string.

5. Functions. {"fn": function(){}} → JSON is data only, not code.

6. Unescaped quotes. {"text": "Said "hello""} → escape: "Said \"hello\"".

Use the NexTools JSON formatter to clean up format.

REST APIs: 99% of modern APIs return JSON. Validating responses before processing prevents silent errors.

package.json: A JSON error breaks npm install. Most validated file in the Node ecosystem.

tsconfig.json: TypeScript config. Accepts JSONC but must be structurally valid.

Compare two JSONs with the NexTools text comparator.

jq (terminal): echo '{"a":1}' | jq . — validates and formats.

Python: import json; json.loads('{"a": 1}')

Node.js: JSON.parse('{"a": 1}')

VS Code: Shows JSON errors in real-time with red squiggly lines.

For quick use, the NexTools online validator is most practical.

Syntax validation is step one. JSON Schema goes further: validates that STRUCTURE and TYPES are correct. A schema requiring a user to have name (string), age (number, min 0), and email (string with email format) rejects non-conforming data.

Used in: API validation (OpenAPI/Swagger), web forms, CI/CD config, and any system needing guaranteed data structure.

API JSONs often contain sensitive data: auth tokens, user data, API keys. NexTools processes everything in your browser — no data leaves your computer. For sensitive JSONs, ALWAYS use local tools.

To encode data before sharing, use the NexTools Base64 encoder.