TypeError: Do not know how to serialize a BigInt WHEN JSON.stringify(OBJECT)

Question

Right now I'm getting a weird error, I'm trying to convert an object to a string and I get this type error.

const x = await web3.eth.getTransaction(tx); console.log(x); ^ Console Output: { blockHash: '0x000ef0000abf000d0f000e0ff000c000a00d750d066ea0c60a00f0000b0f000c0', blockNumber: 0n, from: '0x0c000f0e0c000e000bfbc0c002000c0b0ec100000', gas: 0n, gasPrice: 0n, maxFeePerGas: 0n, maxPriorityFeePerGas: 0n, hash: '0x000000000000000d00f000f0000ffa000bd000c00cc0000b0fd000a0a00ffccfc', input: '0x', nonce: 0n, to: '0x000d0aa0fa0000ef00b00cb0e0000d000c0a00e0', transactionIndex: 0n, value: 0n, type: 0n, accessList: [], chainId: 0n, v: 0n, r: '0xa0000f00000f00c0b000000bffc000000000a000000000cc00e000100aa0d0d0', s: '0x0c0f00ec0cf0df0eb0000e00bce0000d00b0000a0000ffae0cc0ef28000e0cc', data: '0x' }

But then I try to convert x into a string:

JSON.stringify(recoverTransaction) ^ TypeError: Do not know how to serialize a BigInt

BigInt is not one of the valid JSON datatypes, you can't use JSON.stringify() to convert it to a string. — Barmar
– Barmar, Commented Mar 24 at 1:24
Check stackoverflow.com/questions/65152373/serialize-bigint-in-json — James
– James, Commented Mar 24 at 1:29

Teyrox · Accepted Answer · 2025-03-24 01:42:03Z

I solved with this function:

Checks if the value is of type bigint and converts it to a string using value.toString().
Non-bigint values remain unchanged.

JSON.stringify(x, (key, value) => typeof value === 'bigint' ? value.toString() : value );

The transaction object is now successfully serialized as a JSON string, with all BigInt values represented as strings.

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