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FIELD GUIDE / PRACTICAL STEPS

Why a JSON File Is Invalid

Locate JSON syntax problems and inspect valid documents safely.

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Work through this in order

  1. Check that all object keys use double quotes
  2. Look for trailing commas and missing brackets
  3. Inspect the precise error position reported by the validator
  4. Confirm the file uses valid text encoding
  5. Fix a copy and validate the entire file again

Use the matching tool

Inspect a local copy with JSON File Viewer. After the check, save or repair files only using trusted software that supports the format.