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Fix JSON unexpected token errors

Unexpected token errors usually mean invalid quotes, comments, missing commas, or extra text before or after the JSON value.

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HappyFormatter tools process pasted snippets client-side for quick, privacy-first developer workflows.

No upload

HappyFormatter tools process pasted snippets client-side for quick, privacy-first developer workflows.

No account

HappyFormatter tools process pasted snippets client-side for quick, privacy-first developer workflows.

Fix steps

  1. 1 Check whether object keys use double quotes.
  2. 2 Remove comments and unsupported JavaScript syntax.
  3. 3 Validate with the private JSON viewer.

Invalid JSON

JSON keys must be quoted strings.

{ name: "Ada" }

Output

Unexpected token n in JSON

Fixed JSON

Quote object keys and keep JSON syntax strict.

{ "name": "Ada" }

Output

Valid JSON object

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