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# Derivation JSON Format
> **Warning**
>
> This JSON format is currently
> [**experimental**](@docroot@/development/experimental-features.md#xp-feature-nix-command)
> and subject to change.
The JSON serialization of a
[derivations](@docroot@/glossary.md#gloss-store-derivation)
is a JSON object with the following fields:
* `name`:
The name of the derivation.
This is used when calculating the store paths of the derivation's outputs.
* `outputs`:
Information about the output paths of the derivation.
This is a JSON object with one member per output, where the key is the output name and the value is a JSON object with these fields:
* `path`:
The output path, if it is known in advanced.
Otherwise, `null`.
* `method`:
For an output which will be [content addresed], a string representing the [method](@docroot@/store/store-object/content-address.md) of content addressing that is chosen.
Valid method strings are:
- [`flat`](@docroot@/store/store-object/content-address.md#method-flat)
- [`nar`](@docroot@/store/store-object/content-address.md#method-nix-archive)
- [`text`](@docroot@/store/store-object/content-address.md#method-text)
- [`git`](@docroot@/store/store-object/content-address.md#method-git)
Otherwise, `null`.
* `hashAlgo`:
For an output which will be [content addresed], the name of the hash algorithm used.
Valid algorithm strings are:
- `md5`
- `sha1`
- `sha256`
- `sha512`
* `hash`:
For fixed-output derivations, the expected content hash in base-16.
> **Example**
>
> ```json
> "outputs": {
> "out": {
> "path": "/nix/store/2543j7c6jn75blc3drf4g5vhb1rhdq29-source",
> "method": "nar",
> "hashAlgo": "sha256",
> "hash": "6fc80dcc62179dbc12fc0b5881275898f93444833d21b89dfe5f7fbcbb1d0d62"
> }
> }
> ```
* `inputSrcs`:
A list of store paths on which this derivation depends.
* `inputDrvs`:
A JSON object specifying the derivations on which this derivation depends, and what outputs of those derivations.
> **Example**
>
> ```json
> "inputDrvs": {
> "/nix/store/6lkh5yi7nlb7l6dr8fljlli5zfd9hq58-curl-7.73.0.drv": ["dev"],
> "/nix/store/fn3kgnfzl5dzym26j8g907gq3kbm8bfh-unzip-6.0.drv": ["out"]
> }
> ```
specifies that this derivation depends on the `dev` output of `curl`, and the `out` output of `unzip`.
* `system`:
The system type on which this derivation is to be built
(e.g. `x86_64-linux`).
* `builder`:
The absolute path of the program to be executed to run the build.
Typically this is the `bash` shell
(e.g. `/nix/store/r3j288vpmczbl500w6zz89gyfa4nr0b1-bash-4.4-p23/bin/bash`).
* `args`:
The command-line arguments passed to the `builder`.
* `env`:
The environment passed to the `builder`.
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