Back to Editor
{}

Repair Missing Key-Value Separators

Automatically insert missing colons (:) between JSON keys and values.

Problem Example

This invalid JSON will cause parsing errors

{ "id" 101, "name" "John" }

Why This Happens

A colon is strictly required to separate a key from its value. This error often happens during manual data entry.

How to Fix

Use our online tool to automatically repair this issue

  1. Copy your broken JSON
  2. Paste it into the editor below
  3. The tool will automatically detect and fix the issue
  4. Download or copy the repaired JSON

Common Causes

This JSON error typically occurs when:

  • Copying data from different programming languages
  • Manual data entry without proper validation
  • Using AI tools that generate non-standard JSON
  • Exporting from applications with loose formatting

About JSON Standard

JSON (JavaScript Object Notation) is a strict data interchange format. Unlike JavaScript objects, JSON requires:

  • All keys must be enclosed in double quotes
  • String values must use double quotes (not single quotes)
  • No trailing commas after the last item
  • No comments allowed
  • Proper escaping of special characters