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JavaScript JSON.parse failed because the JSON is invalid

SyntaxError: JSON.parse: bad parsing

JavaScript could not parse a JSON string because the input is not valid JSON syntax.

SyntaxError: JSON.parse: bad parsingjson

Observed message

SyntaxError: JSON.parse: bad parsing

Why it happens

  • The string is not valid JSON syntax.
  • Object keys, strings, commas, or quotes are malformed.
  • JavaScript object literal syntax was mistaken for valid JSON.

How to fix it

  1. Validate the JSON string with a parser or formatter.
  2. Make sure keys and string values use double quotes as required by JSON.
  3. Remove trailing commas, comments, and other JavaScript-only syntax.

Official reference

MDN: SyntaxError: JSON.parse: bad parsing

Related errors

TypeError: BigInt value can't be serialized in JSONJavaScript BigInt value cannot be serialized in JSONTypeError: cyclic object valueJavaScript tried to serialize a circular objectReferenceError: can't access lexical declaration before initializationJavaScript accessed a let or const binding before initializationReferenceError: assignment to undeclared variableJavaScript assigned to an undeclared variable

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JavaScript JSON.parse bad parsing: causes and fixes | Error Atlas