Expected Comma or Closing Brace in JSON – Fix Object Syntax

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After a complete object value, JSON allows either a comma for another property or a closing brace to end the object. Any other token can trigger this error.

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36 chars · 4 lines

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Invalid JSONExpected ',' or '}' after property value
Line 3Column 3Character 21Found “"”
"active": true
The highlighted character is where JSON parsing stopped.

JSON object separator error

Why JSON expects a comma or closing brace

Once an object property value is complete, the grammar has only two valid next steps: separate another property with a comma or finish the object with }. A following property name without a comma is a common cause. This tool is free to use. No account or payment is required.

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What you can do here

  • Browser-local JSON processing
  • Route-specific malformed JSON example
  • Focused parser or repair guidance
  • Broken and corrected JSON example
  • Related JSON problem navigation

Steps

  1. Locate the previous complete property value at the parser position.
  2. If another property follows, insert one comma between the two members.
  3. If the object should end there, verify the closing brace and validate again.

The missing comma may be just before the reported token

A parser frequently points at the next quoted property name because that is where it discovers the previous value was not followed by a legal separator.

  • Two object properties placed next to each other.
  • A string or nested value that did not close correctly.
  • A copied fragment missing its object boundary.

Do not add commas blindly

If the earlier string, array, or object is incomplete, inserting a comma may only move the parser error. Confirm that the preceding value is syntactically complete first.

Expected comma or closing brace example

The name property is complete, but the active property begins without a comma separator.

Invalid object

{
  "name": "Ada"
  "active": true
}

Valid object

{
  "name": "Ada",
  "active": true
}

Common questions

Frequently asked questions

Where should I add the missing comma?

Usually between the previous complete value and the next property name. Confirm that the previous value is complete before inserting it.

Can a broken string cause the same error?

Yes. If the previous value never closes correctly, the parser may reach the next token while still expecting the earlier value to finish.

Are trailing commas allowed before the closing brace?

No. JSON requires commas only between members, not after the final property.

Recommended next steps

Missing Comma in JSONLocate adjacent properties or array values that need a separator.Expected Property Name in JSONFind object members whose property names are missing required double quotes or syntax.JSON Error Checker Online – Find Syntax ErrorsLocate parser failures with line, column, character position, and nearby source context.

Debugging a specific JSON issue? Browse JSON troubleshooting.