How to Find and Fix JSON Syntax Errors

Use these short examples to understand quotes, commas and bracket errors. The validator locates syntax problems; you make the corrections yourself.

Common JSON Validation Errors

Object keys must be wrapped in double quotes, such as "name": "Toolbye".

Strict JSON does not allow single quotes for keys or string values.

Each property and array item must be separated by exactly one comma.

JSON rejects a comma after the last property or array item.

Ensure object and array brackets are paired correctly from start to end.

Comments are valid in JS, but not in strict JSON documents.

Why does valid JavaScript become invalid JSON?

JSON is stricter than JavaScript. Comments, single quotes, and trailing commas are common reasons.

What should I fix first when multiple errors exist?

Fix the earliest reported line first. Later errors are often side effects of the first syntax break.

Can this page repair JSON automatically?

No. Neither this guide nor the tool automatically repairs malformed JSON. Edit the reported issue yourself, then validate again.

How do I avoid JSON errors in API payloads?

Validate payloads before sending requests, and keep your API examples in strict JSON format.

Open the main editor to validate JSON after your corrections.

Paste JSON below to check syntax and locate errors by line and column. Correct the input yourself, then copy or download the formatted result.

Paste valid JSON below to produce a compact result. Syntax is checked before output; copy or download the result in this workspace.

Convert Unix timestamps while debugging API response fields.

Decode and encode payload fragments while troubleshooting API data.