GSTR 1 JSON Validator

Fix and Validate GSTR-1 JSON File Online

Validate your GSTR-1 JSON file if you are getting an error on the GST Portal. This tool checks your JSON against the same kind of structure, format, and schema rules the portal enforces — the ones behind errors like "Error in JSON structure validation" or "File could not be uploaded! Download the latest version of Offline Tool..." — auto-fixes what it safely can, and points you straight to anything that still needs a manual fix.

Steps to Validate and Fix Your GSTR-1 JSON

  1. Select your GSTR-1 JSON file downloaded from the GST Offline Tool.
  2. Click the Validate JSON button to start analysis.
  3. The tool will automatically display any detected errors, such as:
    • Invalid POS at b2cs.4.pos
    • Invalid sply_ty 'INTRAB2C' at b2cs.4.sply_ty (allowed values: INTER, INTRA)
  4. Click any error message to automatically scroll to that specific line in the JSON viewer.
  5. Edit the incorrect value directly inside the built-in JSON editor to fix the issue.
  6. Click Recheck JSON at any time to re-validate your edits.
  7. After fixing all errors, click Download corrected JSON to save your file.
  8. Finally, upload the corrected JSON file to the GST Portal to file your GSTR-1 without errors.

FAQ

This usually means one or more fields in your GSTR-1 JSON file don't match the structure or format the portal expects — for example, an invalid Place of Supply (POS) code or an incorrect supply type value. This tool scans for these mismatches and shows you the exact line and field causing the error.
This message appears when the JSON file's structure doesn't match what the current version of the GST Offline Tool produces, often due to outdated formatting or manually edited values. Validating and auto-fixing your file here resolves most cases without needing to redo your return from scratch.
Your file is processed only to detect and fix structural errors for your own use, and the corrected file is returned directly to you for download.
The tool auto-fixes common, safe-to-correct issues automatically. Errors that depend on your actual business data — such as an incorrect GSTIN or invoice value — are flagged for you to review and correct manually in the built-in editor.
No. The GSTR-1 JSON Validator runs entirely in your browser — just upload your .json file exported from the GST Offline Tool, and download the corrected version when you're done.