Developer Tools
Validate JSON instantly and catch syntax errors before they break your app, API, or config.
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.
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.
Use json validator when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
JSON Validator is best when your main goal is to check whether JSON is valid or invalid. JSON Formatter is better when you want readable structured output after the syntax is already correct. If you need a quick pass or fail answer first, start with the validator. If you need to inspect the structure visually, move to the formatter next.
JSON Validator checks syntax correctness. JSON Minifier removes whitespace from JSON that is already valid. If the payload is broken, minifying will not help until the syntax problems are fixed.
If your JSON is valid and you want to inspect it more clearly, open JSON Formatter. If the payload is valid and you need compact output for transport or storage, use JSON Minifier. If your next step is turning JSON into tabular data, continue with JSON to CSV.
If this tool runs fully in the browser, your input stays on the client side instead of being uploaded to a server. That makes JSON validation useful for quick checks on API payloads, configs, logs, and copied snippets when you want a fast local result.
JSON Validator is best when your main goal is to check whether JSON is valid or invalid. JSON Formatter is better when you want readable structured output after the syntax is already correct. If you need a quick pass/fail answer first, start with the validator. If you need to inspect the structure visually, move to the formatter next.
JSON Validator checks syntax correctness. JSON Minifier removes whitespace from JSON that is already valid. If the payload is broken, minifying will not help until the syntax problems are fixed.
If your JSON is valid and you want to inspect it more clearly, open JSON Formatter. If the payload is valid and you need compact output for transport or storage, use JSON Minifier. If your next step is turning JSON into tabular data, continue with JSON to CSV.
If this tool runs fully in the browser, your input stays on the client side instead of being uploaded to a server. That makes JSON validation useful for quick checks on API payloads, configs, logs, and copied snippets when you want a fast local result.
JSON Validator answers one main question: is this payload valid or not? JSON Formatter is for readability. If your first problem is an error message or a failed parse, validate first. If the payload is valid but messy, format it next.
JSON Validator checks syntax correctness. JSON Minifier removes whitespace from valid JSON. If your JSON is broken, minifying will not help. Validate it first, then minify it if you need compact output.
Once your JSON passes validation, you may want to make it easier to inspect with JSON Formatter. If you need a smaller payload for transport or embedding, use JSON Minifier. If your next step is tabular data, try JSON to CSV.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
{"name":"John","age":30} Output
Valid JSON
A basic JSON object with quoted keys and valid syntax passes validation.
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.
Input
{"name":"John",} Output
Invalid JSON
Trailing commas are allowed in some contexts in JavaScript, but not in JSON.
Input
{name:"John"} Output
Invalid JSON
JSON keys must always use double quotes.
Input
{'name':'John'} Output
Invalid JSON
JSON requires double quotes for strings and object keys.
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.
Input
{"user":{"id":7,"name":"Anna"} Output
Invalid JSON
A missing closing brace makes the payload incomplete and invalid.
Input
{"type":"invoice.paid","data":{"id":"inv_123","amount":1299}} Output
Valid JSON
Useful when testing integrations and checking event bodies before processing them.
Fix: Remove the final comma in objects and arrays before validating again.
Fix: Wrap every object key in double quotes, for example "name".
Fix: Replace single quotes with valid JSON double quotes.
Fix: Check that every { has a matching } and every [ has a matching ].
Fix: Copy the full JSON object or array instead of a truncated fragment.
A JSON validator checks whether your JSON follows valid syntax rules and can be parsed correctly.
JSON Validator focuses on whether the JSON is valid. JSON Formatter focuses on making valid JSON easier to read.
JSON Validator checks syntax correctness. JSON Minifier removes whitespace from already valid JSON to make it smaller.
The usual reasons are trailing commas, missing double quotes around keys, single quotes, broken nesting, or incomplete copied data.
Not always. JSON can be syntactically valid but still contain the wrong values, field names, or schema for your application.
Yes. Deeply nested objects and arrays are supported as long as the structure is complete and valid.
Yes. This is one of the most common use cases for a JSON validator.
Yes. It is useful for checking JSON config files before deploying or sharing them.
Use JSON Formatter after validation when you want to inspect the structure visually or share the payload in a readable format.
Yes. JSON copied from logs, network panels, and browser tools often includes mistakes or truncation, and this page is useful for catching that fast.