SECURITY
Implementing Zero-Knowledge Proofs in TypeScript
CryptKeeper
Core_Engineer
Date
JAN 15, 2026
Time
15 min
Privacy Without Exposure
Zero-Knowledge Proofs (ZKP) allow a user to prove they know a secret (like a password or a bank balance) without ever revealing the secret itself to the server. With snarkjs and circom, this technology is finally accessible to web developers.
The "Circuits" Concept
In ZKP, we don't write code; we write arithmetic circuits. These circuits represent the logic of the proof. Once compiled, the user generates a 'witness' and a 'proof' locally in their browser. The server only receives a few bytes that say "TRUE" or "FALSE".
// Generating a proof in the client
const { proof, publicSignals } = await snarkjs.groth16.fullProve(
{ secret: mySecret, hash: expectedHash },
"circuit.wasm",
"circuit_final.zkey"
);
// The server verifies this proof in < 10ms