🩹 n8n JSON Repair Tool

Free JSON Fixer for n8n Invalid JSON Errors

Fix malformed JSON instantly and understand what went wrong.

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What Causes Invalid JSON Errors in n8n?

Invalid JSON errors in n8n typically occur in HTTP Request nodes, Code nodes, or when parsing API responses. Common causes include missing quotes around strings, trailing commas, unescaped special characters, or expressions that resolve to [object Object] instead of actual values. The Set/Edit Fields node in JSON mode is particularly prone to these issues.

Why JSON Errors Are So Common in n8n

n8n workflows frequently handle JSON data from APIs, webhooks, and databases. When combining dynamic expressions with static JSON structures, it's easy to create invalid syntax. The error messages like 'The JSON Output contains invalid JSON' don't tell you WHERE the problem is. This tool pinpoints the exact issue and fixes it.

Avoiding JSON Errors in n8n

Use the Set node instead of Code node for simple data transformations
When using JSON mode, wrap the entire structure in double curly brackets
Avoid special characters like $& in expressions (known bug)
Use JSON.parse() and JSON.stringify() in Code nodes for safety
Test API responses with a temporary Set node to inspect the structure
Use a JSON validator before pasting into n8n

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