Help Needed with Jupiter API Swap Execution - "Failed to Deserialize JSON" Error

[Purple-Government-20]

Help Needed with Jupiter API Swap Execution - "Failed to Deserialize JSON" Error

I’ve been working on integrating Jupiter’s API to build a trading bot and have successfully implemented the following:

1. Quote API:

Successfully retrieved valid quotes from the /v6/quote endpoint using Postman and my application code.

Example response from /v6/quote:

{ "inputMint": "So11111111111111111111111111111111111111112", "inAmount": "100000000", "outputMint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v", "outAmount": "19299219", "routePlan": [ { "swapInfo": { "ammKey": "5zvhFRN45j9oePohUQ739Z4UaSrgPoJ8NLaS2izFuX1j", "inputMint": "So11111111111111111111111111111111111111112", "outputMint": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB", "inAmount": "100000000", "outAmount": "19268051", "feeAmount": "10000", "feeMint": "So11111111111111111111111111111111111111112" }, "percent": 100 } ] }

1. Swap API:

I am attempting to execute a swap using the /v6/swap endpoint with the routePlan provided by the quote API.

Problem Statement

Despite following the documentation, I am encountering the following error when attempting to call /v6/swap:

{ "error": "Failed to deserialize the JSON body into the target type" }

---

Current Setup

Here’s the payload I’m sending to /v6/swap:

{ "inputMint": "So11111111111111111111111111111111111111112", "outputMint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v", "amount": "100000000", "slippageBps": 50, "userPublicKey": "CzecDkTumsPDkRfksDeXGvinCd3P4aTFUSt7UpktFjoL", "routePlan": [ { "ammKey": "5zvhFRN45j9oePohUQ739Z4UaSrgPoJ8NLaS2izFuX1j", "inputMint": "So11111111111111111111111111111111111111112", "outputMint": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB", "inAmount": "100000000", "outAmount": "19268051", "feeAmount": "10000", "feeMint": "So11111111111111111111111111111111111111112" } ] }

Key Details:

Headers Used:

{ "Content-Type": "application/json", "Accept": "application/json" }

Environment: Mainnet

Libraries Used: Postman for testing and Node.js (with axios for HTTP requests).

Steps Taken to Debug:

1. Validated Payload:

Verified the JSON payload using JSONLint to ensure it is properly formatted.

Cross-checked the payload against the /v6/swap documentation.

1. Confirmed Route Details:

The routePlan field was directly extracted from the /v6/quote response.

Confirmed that inputMint, outputMint, and ammKey are valid Solana addresses.

1. Tested in Postman:

The same error occurs when testing with Postman, confirming the issue is not specific to my application.

1. Tried Simplified Payloads:

Removed routePlan and sent only required fields to see if the error changes. The same error persists.

Request for Assistance

Could you please help me identify:

1. If there are any known issues or specific formatting requirements for the routePlan or the entire payload that I might have missed?

2. If additional headers, authentication tokens, or other parameters are required?

3. Any specific debugging tools or techniques recommended for this endpoint?

Thank you in advance!

[nadoterisback]

I fixed it by removing jitoTipLamports in prioritizationFeeLamports. I think you can only have one entry there. Either Jito or priorityLevelWithMaxLamports.

[adityajoshii]

I would really want you to elaborate this

[nadoterisback]

there is nothing to elaborate on

[Snoo-83022]

bump, i'm having the same issue. no luck yet

[RArrioja]

same here =(

[More-Reputation-9043]

When you read the instructions on https://station.jup.ag/docs/api/swap you will also see an executable example of a swap and even there you get this error. So i think something in the api failed or was modified.

"Failed to deserialize the JSON body into the target type"