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JSON Validator Examples

Review practical JSON Validator examples so you can understand expected input, output, and common patterns faster.

Why examples matter for JSON Validator

Use this free JSON Validator to validate JSON online and check whether a payload is syntactically correct before it reaches your app, API, or config. It helps catch invalid JSON in request bodies, webhook payloads, config files, copied logs, exported data, and browser-copied snippets. Paste raw JSON to check it quickly and spot common problems such as trailing commas, missing double quotes, broken brackets, single quotes, or incomplete objects.

Example pages are especially useful for developer tools because they show what good input looks like, what kind of output to expect, and how the tool behaves in common scenarios.

JSON Validator examples

Valid simple object

Input

{"name":"John","age":30}

Output

Valid JSON

A basic JSON object with quoted keys and valid syntax passes validation.

Valid nested object

Input

{"user":{"id":7,"name":"Anna"},"roles":["admin","editor"]}

Output

Valid JSON

Nested objects and arrays are valid as long as the structure is complete and properly quoted.

Invalid JSON with trailing comma

Input

{"name":"John",}

Output

Invalid JSON

Trailing commas are allowed in some contexts in JavaScript, but not in JSON.

Invalid JSON with unquoted key

Input

{name:"John"}

Output

Invalid JSON

JSON keys must always use double quotes.

Invalid JSON with single quotes

Input

{'name':'John'}

Output

Invalid JSON

JSON requires double quotes for strings and object keys.

Valid API response payload

Input

{"status":200,"data":{"items":[1,2,3],"count":3}}

Output

Valid JSON

Useful for checking whether copied API responses are structurally safe to parse.

Invalid incomplete object

Input

{"user":{"id":7,"name":"Anna"}

Output

Invalid JSON

A missing closing brace makes the payload incomplete and invalid.

Valid webhook event body

Input

{"type":"invoice.paid","data":{"id":"inv_123","amount":1299}}

Output

Valid JSON

Useful when testing integrations and checking event bodies before processing them.

How to use these examples

  1. Paste your JSON into the input box
  2. Click Run Tool to validate the payload
  3. Read the result to see whether the JSON is valid or invalid
  4. If it fails, review the input for missing quotes, commas, or broken brackets
  5. Fix the JSON and run the check again before using it elsewhere

Common mistakes in sample input

Trailing commas after the last item

Fix: Remove the final comma in objects and arrays before validating again.

Keys are written without double quotes

Fix: Wrap every object key in double quotes, for example "name".

Single quotes are used for strings

Fix: Replace single quotes with valid JSON double quotes.

Opening and closing brackets do not match

Fix: Check that every { has a matching } and every [ has a matching ].

Only part of the payload was pasted

Fix: Copy the full JSON object or array instead of a truncated fragment.

Next steps

After reviewing these examples, run the live tool with your own input. If your task involves a follow-up step, the related page can help you move to the next tool in the workflow.

Run the main tool

Open the main JSON Validator page and test your own real input.

Open JSON Validator