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Python JSONDecodeError: Expecting value

This Python error usually indicates empty input, non-JSON text, or broken JSON syntax. The key is to validate raw input before decode.

Typical Causes

  • Empty string passed to json.loads.
  • API returned HTML/plain text, not JSON.
  • Single quotes or trailing commas.
  • UTF-8 BOM at start of file.

Debug Workflow

  1. Log raw payload length and first characters.
  2. Validate content in JSON Validator.
  3. Normalize structure with JSON Formatter.
  4. Use Python JSON workflow guide for code-level handling.

Related Tools

Use JSON Parser for parse checks and JSON Diff when comparing failing vs working payloads.

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