How do I hide JSON keys from ChatGPT?

Paste your JSON into JSON Prompt Shield at unblockdevs.com/json-prompt-shield. Keys become K_00001, strings become S_00001. Send masked version to AI, restore real names after with one click.

How do I mask JSON before sending to ChatGPT?

Paste your JSON into the JSON Prompt Shield, enable "Mask keys" and "Mask strings", then copy the masked output. Paste that into ChatGPT. Your real field names are replaced with placeholders like K_00001 and S_00001. Use the mapping file to restore AI responses to your original names.

Can I restore AI output to my real field names?

Yes. The tool gives you a mapping file (or in-page restore). Paste the AI response and the mapping to get back your original keys and string values.

Does this work for API responses?

Yes. Paste any API response JSON — REST, GraphQL, webhooks. Mask the sensitive fields, get AI help with the structure, restore after.

Is JSON Prompt Shield free?

Yes. Completely free, no signup, runs entirely in your browser. Nothing is sent to any server.

JSON Prompt Shield — Mask JSON Keys & Values Before Sending to ChatGPT

High-performance JSON payload masking: keys → K_00001, string values → S_00001. Numbers unchanged. Structure preserved. 100% client-side, fully reversible.

100% Data Security—nothing sent to servers

Client-side only—runs in your browser

Mask JSON payload

Paste JSON → mask keys and string values → copy and send to AI → paste AI response below and restore.

Mask keysMask string valuesMask booleans

Ignore keys (optional, comma or newline)

Original JSON

Masked output

Restore AI response

Paste the AI's JSON reply (with K_00001, S_00001, etc.) and restore to original keys/values

Load mapping

Keys → K_00001, string values → S_00001. Numbers and null unchanged. Iterative traversal supports large payloads (MBs). All processing in your browser.

Why Mask JSON Before Sending to AI?

When you paste JSON into ChatGPT or any AI assistant, your real field names, string values, and data structure are sent to the AI provider's servers and may be retained under their data policies. For developers handling PII, healthcare records (HIPAA), financial data (PCI DSS), or enterprise schemas, this is a privacy and compliance risk. JSON Prompt Shield replaces every key with K_00001 and every string value with S_00001 before you paste — so the AI only sees a sanitized structure, never your real data.

The masking is fully reversible. After the AI responds with advice about the structure, paste the response back alongside the mapping table and restore your original field names in one click.

How it works

Mask and Restore in 4 Steps

Paste your JSON

Paste any JSON payload — API response, database record, configuration, or GraphQL result.

Choose what to mask

Toggle "Mask keys", "Mask string values", or both. Numbers, booleans, and null are left as-is so the AI can reason about types.

Copy masked JSON to AI

Copy the masked output and paste it into ChatGPT, Claude, or any AI. Ask your question about the structure — the AI sees only generic placeholders.

Restore real names

Paste the AI response into the Restore tab along with your mapping. Real field names and string values are substituted back instantly.

Use cases

Who Uses JSON Prompt Shield?

🏥

Healthcare (HIPAA)

Mask patient record fields before asking AI to help design transformations or queries without exposing PHI.

💳

Finance (PCI DSS)

Sanitize payment API responses containing card or account data before using AI for schema analysis.

🏢

Enterprise APIs

Protect internal field naming conventions and business logic from being sent to third-party AI services.

🛡️

GDPR Compliance

Mask any field that could identify a natural person before processing with external AI tools.

👩‍💻

API Debugging

Get AI help debugging a complex JSON structure without exposing real user data or tokens.

📋

Code Review AI Assistance

Ask AI to review your API schema design while keeping actual field names and business logic private.

FAQ

Frequently Asked Questions

1Is it safe to paste JSON into ChatGPT?

When you paste JSON into ChatGPT, your real field names and string values are sent to OpenAI servers. Use JSON Prompt Shield to mask keys to K_00001 and values to S_00001 before sending — fully reversible after the AI responds.

2Can ChatGPT see my JSON field names?

Yes. Any JSON pasted into ChatGPT exposes your real key names, string values, and payload structure to OpenAI servers. Use JSON Prompt Shield first so the AI only sees generic placeholders.

3How do I hide sensitive JSON values from AI?

Paste your JSON, enable "Mask strings", and copy the masked output. String values are replaced with S_00001, S_00002, etc. Numbers, booleans, and null are preserved so the AI understands types.

4How do I restore my original field names after?

Use the Restore tab. Paste the AI response and the mapping table. The tool substitutes every K_00001 and S_00001 placeholder back to the original name or value.

5Is my data sent to your servers?

No. All masking and restoring runs in your browser. Nothing is uploaded or stored. You can verify by turning off your internet before masking.

6Does this work for HIPAA or PCI DSS compliance?

JSON Prompt Shield is a practical tool for reducing risk, but not a certified HIPAA or PCI DSS compliance solution. Consult your compliance officer before using AI tools with regulated data.

7Can it detect PII automatically?

The tool masks all string values by default, inherently protecting any PII. Enable string masking to replace all string values with S_00001 placeholders regardless of content type.

8Does it work with deeply nested JSON?

Yes. The masker recursively processes all levels of JSON nesting. Objects within arrays, arrays within objects, and deep nesting are all fully traversed and masked.

9How do I mask only specific JSON fields?

Mask the full payload and use the mapping to selectively restore the fields that are not sensitive, or manually edit the JSON before pasting to remove only the specific sensitive fields.

10Can I use it for GDPR compliance?

JSON Prompt Shield helps reduce GDPR risk by masking personal data before sending to AI providers. Consult your Data Protection Officer for full compliance requirements.

11What is the difference between redaction and masking?

Redaction permanently removes data with no recovery option (e.g. [REDACTED]). Masking replaces data with a reversible placeholder using a mapping table so the original can be restored after AI responds.

12Is the JSON sent to any server?

No. All masking runs in your browser. Nothing is uploaded. You can confirm by disabling your internet before masking — the tool works completely offline.

13Can it mask email addresses in JSON?

Yes. Email addresses stored as string values are masked with S_00001 placeholders when string masking is enabled. The original email is stored in the mapping for later restoration.

14What is JSON de-identification?

JSON de-identification transforms data so it cannot be linked to a specific individual — required under HIPAA and GDPR. JSON Prompt Shield performs reversible de-identification with anonymous placeholders and a mapping for restoration.

Learn more

Developer Guides

📖JSON Privacy for AI 📖Masking JSON for LLMs 📖Safe AI API Workflows 📖JSON Prompt Engineering

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