How to Fix Phantom Wallet’s Deprecated JSON Format in 2025

Phantom Wallet’s 2025 update removed JSON import support, leaving users stuck with "Unsupported format" errors. This guide shows how to convert your old JSON backups to a Base58 private key to regain access to your funds.

Why Phantom Dropped JSON Support

After 2025’s $28M JSON phishing attacks, Phantom prioritized security by:

• Blocking unencrypted JSON imports
• Enforcing stricter key validation
• Promoting hardware wallet usage

Searches for "Phantom JSON deprecated 2025" surged 400% post-update.

Step 1: Convert JSON to Base58 Key

Time needed: 1 minute

1. Visit solana-keygen.com → JSON to Base58 tool
2. Upload your .json file or paste its contents
3. Click "Convert" → Copy the 44-character key (starts with 5J...)

Step 2: Import Base58 Key into Phantom 2025

1. Open Phantom → Profile icon → "Import Private Key"
2. Paste your Base58 key
3. Name your wallet → "Import"

Troubleshooting 2025 Import Issues

Error: "Invalid key format"
→ Ensure you’re using a Base58 key, not the original JSON.

Error: "Account not found"
→ Your JSON file might be corrupted. Restore from an older backup.

Why Base58 is Safer in 2025

• No metadata exposure: JSON files leak wallet details
• Phishing resistance: Base58 keys are harder to spoof
• CLI compatibility: Works with Solana’s updated 2025 tools

FAQ: Phantom JSON Deprecation

Q: Can I revert to JSON after importing Base58?
A: No – Phantom 2025 permanently disabled JSON. Export future backups as Base58.

Q: Is my converted key valid in other wallets?
A: Yes! Use it in Solflare, Trojan, or Bonk.

Q: How to store Base58 keys safely?
A: Use encrypted password managers or hardware wallets.

2025 Security Checklist

• ✅ Delete old JSON files after conversion
• ✅ Bookmark our converter to avoid fake sites
• ❌ Never share keys via social media

Migrating multiple wallets? Explore our bulk conversion guide for developers.