What is the SHA-256 hash of "undefined"?

Q: What is the SHA-256 hash of "undefined"?

The SHA-256 hash of "undefined" is "eb045d78d273107348b0300c01d29b7552d622abbc6faf81b3ec55359aa9950c".

SHA-256 Hash of "undefined"

SHA-256

eb045d78d273107348b0300c01d29b7552d622abbc6faf81b3ec55359aa9950c

The SHA-256 hash of "undefined" is: eb045d78d273107348b0300c01d29b7552d622abbc6faf81b3ec55359aa9950c

All hash values

SHA-256Recommendedeb045d78d273107348b0300c01d29b7552d622abbc6faf81b3ec55359aa9950c

SHA-1d5d4cd07616a542891b7ec2d0257b3a24b69856e

SHA-3842c38fcb6b9a4506ce7efbe95cac7edc4071c884e20b4dfc590ab709d0541a061fc408d1dba8f68cb9aed255fd4a48ad5

SHA-51216a332e891e86030aa9d08ab032fe026c4d4857b64902c386f3ede705373ecf9206f58d712a91a07a63dcbd14f133ab48571bfeb88927995224b299916af8fa5

⚠️ Do not use SHA-1 for security

SHA-1 is considered cryptographically broken. Use SHA-256 or higher for all security-sensitive applications.

How SHA-256 works

SHA-256 is a cryptographic hash function that produces a fixed 256-bit (64-character hex) output. Even a tiny change in the input produces a completely different hash. It is one-way — you cannot reverse a hash to get the original input.

Common uses for hash functions

Password hashing and storage
File integrity verification
Digital signatures and certificates
Blockchain and cryptocurrency
Data deduplication

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