> ## Documentation Index
> Fetch the complete documentation index at: https://developers.stellar.org/llms.txt
> Use this file to discover all available pages before exploring further.

# XDR

> In the Stellar network, transactions are encoded using a standardized protocol called External Data Representation (XDR).

In the Stellar network, transactions are encoded using a standardized protocol called [External Data Representation](https://en.wikipedia.org/wiki/External_Data_Representation) (XDR).

In Horizon, you will only encounter XDR when [posting](https://developers.stellar.org/docs/data/apis/horizon/api-reference/submit-a-transaction.md) and [getting](https://developers.stellar.org/docs/data/apis/horizon/api-reference/retrieve-a-transaction.md) transactions and in the [ledger](https://developers.stellar.org/docs/data/apis/horizon/api-reference/resources/ledgers) header.

When you post a transaction, a client will encode the transaction as XDR before submitting it to Horizon.

When you request a transaction, Horizon returns some data about the transaction in human-readable JSON. The full canonical data about the transaction is encoded in machine-readable XDR, available in XDR attributes at the end of the response.

You can decode this XDR on the Stellar Lab’s [XDR page](https://lab.stellar.org/xdr/view?\$=network\$id=testnet\&label=Testnet\&horizonUrl=https:////horizon-testnet.stellar.org\&rpcUrl=https:////soroban-testnet.stellar.org\&passphrase=Test%20SDF%20Network%20/;%20September%202015;;).

**envelope\_xdr** `string`

The XDR encoded transaction as stellar-core sees it.

**result\_xdr** `string`

The effects of a transaction encoded in XDR.

**result\_meta\_xdr** `string`

The details about the effects of a transaction encoded in XDR.

**fee\_meta\_xdr** `string`

The fees associated with the transaction encoded in XDR.

```json Example Transaction Response with XDR theme={"theme":{"light":"github-light","dark":"github-dark"}}
{
  // Response truncated to highlight XDR-related attributes
  "envelope_xdr": "AAAAAPewD+/6X8o0bx3bp49Wf+mUhG3o+TUrcjcst717DWJVAAAAyAFvzscADTkNAAAAAAAAAAAAAAACAAAAAAAAAAYAAAACWE1BVEsAAAAAAAAAAAAAAAPvNOuztX4IjvV8pztsEc1/ZnTz0G3p5Cx4vcf04+xUAAONfqTGgAAAAAAAAAAABQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAAAD2NyeXB0b21hcmluZS5ldQAAAAAAAAAAAAAAAAF7DWJVAAAAQK3vfUCZ8mbjW3ssMd0n1tJTF9Fv6EbuJ6cWKkYXBqG5itqanPbFzIQoZEHbPS8nr2vo4dROvKI0uQzNcfExKwM=",
  "result_xdr": "AAAAAAAAAMgAAAAAAAAAAgAAAAAAAAAGAAAAAAAAAAAAAAAFAAAAAAAAAAA=",
  "result_meta_xdr": "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",
  "fee_meta_xdr": "AAAAAgAAAAMBlTeXAAAAAAAAAAD3sA/v+l/KNG8d26ePVn/plIRt6Pk1K3I3LLe9ew1iVQAAAAAGXG1YAW/OxwANOQwAAAACAAAAAAAAAAAAAAAPY3J5cHRvbWFyaW5lLmV1AAEAAAAAAAAAAAAAAAAAAAAAAAABAZU3mQAAAAAAAAAA97AP7/pfyjRvHdunj1Z/6ZSEbej5NStyNyy3vXsNYlUAAAAABlxskAFvzscADTkMAAAAAgAAAAAAAAAAAAAAD2NyeXB0b21hcmluZS5ldQABAAAAAAAAAAAAAAAAAAAA"
  // Response truncated to highlight XDR-related attributes
}
```