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Free Online JSON Fix Quotes

Fix single-quoted strings, unquoted keys, and other quote errors in JSON. Convert JavaScript-style object literals to valid JSON in one click.

Popular JSON Tools

JSON requires all string values and object keys to use double quotes. However, developers often write JavaScript object literals using single quotes, paste Python dictionary output that uses single quotes, or copy JSON from sources that use non-standard quoting. The result is technically invalid JSON that no standard JSON parser will accept — even though it looks almost right.

JSON Viewer Pro's Fix Quotes tool detects single-quote strings and unquoted property keys in your input and converts them to the double-quote format required by the JSON specification. Paste your single-quoted or JavaScript-style object literal and the tool produces valid, standard-compliant JSON that can be parsed by any JSON parser in any programming language.

For more complex JSON repair — including fixing trailing commas, missing brackets, wrong data types, and other structural errors — JSON Viewer Pro uses the jsonrepair library to handle a much wider range of invalid JSON formats including JavaScript, Python, and relaxed JSON variants. Fix Quotes is the quick option for the most common quoting mistakes, while contextual repair options appear automatically when invalid JSON is detected.

Key Features

  • ✓ Convert single quotes to double quotes
  • ✓ Fix unquoted property keys
  • ✓ Remove trailing commas
  • ✓ Produce valid standard JSON output
  • ✓ Preview fixes before applying
  • ✓ Copy and download fixed JSON
  • ✓ No data sent to any server
  • ✓ Free and no login required

Common Use Cases

  • → Fix JavaScript object literals
  • → Fix Python dict output pasted as JSON
  • → Fix single-quoted JSON strings
  • → Fix unquoted property names
  • → Convert JS objects to valid JSON
  • → Fix JSON copied from code editors
  • → Repair JSON with inconsistent quoting
  • → Fix JSON from non-standard sources

Frequently Asked Questions

Why does JSON require double quotes?

The JSON specification (RFC 8259) requires double quotes for all strings. Single quotes are valid in JavaScript but not in JSON.

What is the difference between Fix Quotes and Repair?

Fix Quotes handles quoting errors specifically. The full Repair tool handles a much wider range of JSON issues including missing brackets, trailing commas, and more.

Can it fix all types of invalid JSON?

For more complex repair needs, use the contextual repair options shown when invalid JSON is detected. JSON Viewer Pro uses the jsonrepair library for comprehensive JSON restoration.

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