Blob.toData

Extract original data from blob (reads length prefix)

Try it Live

Run Blob examples in the interactive playground

Encoding Format

Blobs created with fromData() use this format:

┌─────────────────┬──────────────┬─────────────┐
│  Length (8 B)   │  Data (N B)  │  Padding    │
├─────────────────┼──────────────┼─────────────┤
│ Little-endian   │ Original     │ Zero bytes  │
│ uint64          │ data         │             │
└─────────────────┴──────────────┴─────────────┘
  Bytes 0-7         Bytes 8-N      Bytes N+1-131071

Total: 131,072 bytes (Blob.SIZE)

Example: Manual Decoding

import { Blob } from 'tevm';

const blob = Blob.fromData(new TextEncoder().encode("test"));

// Manual extraction (equivalent to toData())
const view = new DataView(blob.buffer, blob.byteOffset);
const length = Number(view.getBigUint64(0, true)); // Little-endian
const data = blob.slice(8, 8 + length);

console.log(length); // 4
console.log(new TextDecoder().decode(data)); // "test"

See Also

• fromData - Encode data into blob
• from - Universal constructor
• joinData - Join data from multiple blobs