Input
{a: 1,}Fixed
{
"a": 1
}Developer Tools
JSON Error Locator — Syntax Breakpoint Checker
Locate invalid JSON error positions in your browser, highlight the character that triggers SyntaxError, and apply heuristic fixes for trailing commas, single quotes, and unquoted keys.
JSONDebugLocator
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开发工具
JSON Error Locator
等待输入... 在下方粘贴 JSON。缺引号、多余逗号和非法字面量会标出位置。
纯文本编辑区
Heuristic parsing catches missing commas, trailing commas, unmatched quotes, and raw identifier errors (single quotes converted) where native JSON.parse limits trace output.
Use cases
- Debug malformed JSON returned by an API
- Fix trailing commas or single-quote literals
- Jump straight to the Unexpected token location
How to use
- Paste JSON to inspect
- Read the error message and highlighted position
- Apply a fix and copy the result when needed
Example input and output
FAQ
Will auto-fix always succeed?
Not always. It only applies common heuristics; heavily broken nested JSON still needs manual edits at the reported position.
How is this different from JSON validation?
This tool focuses on breakpoint location and small repairs. Use JSON validation or formatting tools when you need structure overview or pretty printing.
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