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Fake JSON Server is a Fake REST API that can be used as a Back End for prototyping or as a template for a CRUD Back End.

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Fake JSON Server

NuGet

Build server Platform Build status
Travis Linux / macOS Build Status
AppVeyor Windows Build status

Fake JSON Server is a Fake REST API that can be used as a Back End for prototyping or as a template for a CRUD Back End. Fake JSON Server also has an experimental GraphQL query and mutation support.

  • No need to define types for resources, uses dynamic typing
  • No need to define routes, routes are handled dynamically
  • No database, data is stored to a single JSON file
  • No setup required, just start the server and API is ready to be used with any data
Why would I use this instead of other Fake Servers?
  1. API is built following the best practices and can be used as a reference when building your own API
  2. Can be run on Windows, Linux and macOS without any installation or prerequisites from executable or with Docker
  3. See features listed below

Features

  • Supported HTTP methods #
    • All methods for CRUD operations (GET, PUT, POST, PATCH, DELETE)
    • Methods for fetching resource information (HEAD, OPTIONS)
  • Async versions of update operations with long running operations and queues #
  • REST API follows best practices from multiple guides
    • Uses correct Status Codes, Headers, etc.
    • As all guides have slightly different recommendations, this compilation is based on our opinions
  • Token and Basic Authentication #
  • WebSocket update notifications #
  • Simulate delay and errors for requests #
  • Static files #
  • Swagger #
  • CORS #
  • Content Negotiation (output formats JSON, CSV and XML) #
  • Caching and avoiding mid-air collisions with ETag #
  • Configurable custom response transformation #
  • Experimental GraphQL query and mutation support #
Developed with
  • .NET 5
  • Uses JSON Flat File Data Store to store data
  • Can be installed as a dotnet global tool #
  • Can be used without .NET
    • Docker #
    • Self-contained Application #

Table of contents

Click to here to see contents

Get started

Start with .NET CLI

# Get source code from GitHub
$ git clone https://github.com/ttu/dotnet-fake-json-server.git

$ cd dotnet-fake-json-server/FakeServer
$ dotnet run

Start server with defined data-file and url (optional arguments)

# Optional arguments:
#   --file <FILE>    Data store's JSON file (default datastore.json)
#   --urls <URL>     Server url (default http://localhost:57602)      
#   --serve <PATH>   Serve static files (default wwwroot)
#   --version        Prints the version of the app

$ dotnet run --file data.json --urls http://localhost:57602

Install as a dotnet global tool

Server can be installed as a dotnet global tool. Settings files are then located at %USERPROFILE%\.dotnet\tools (Windows) and $HOME/.dotnet/tools (Linux/macOS). By default data stores's JSON file will be created to execution directory.

# install as a global tool
$ dotnet tool install --global FakeServer

# Example: Start server
$ fake-server --file data.json --urls http://localhost:57602

# Update to the newest version
$ dotnet tool update --global FakeServer

Docker

If you don't have .NET installed, you can run the server with Docker.

# Get source code from GitHub
$ git clone https://github.com/ttu/dotnet-fake-json-server.git

$ cd dotnet-fake-json-server
$ docker build -t fakeapi .

# Run in foreground
$ docker run -it -p 57602:57602 fakeapi

# Run in detached mode (run in background)
$ docker run -it -d -p 57602:57602 fakeapi

Copy JSON-file to container. Filename is datastore.json

# Check container id (image name is fakeapi)
$ docker ps

# Copy file from host to container
$ docker cp datastore.json [ContainerId]:/app/datastore.json

# Copy file from container to host
$ docker cp [ContainerId]:/app/datastore.json datastore.json

docker run will reset JSON-file, so copy it before closing the server.

Self-contained Application

The self-contained application archive contains Fake JSON Server, .NET runtime and all required third-party dependencies. No installation or prerequisites are needed.

  1. Go to Latest Release
  2. Download correct archive matching your OS
  3. Extract files and execute

E.g. download and execute version 0.9.1 for macOS

$ mkdir FakeServer && cd FakeServer
$ wget https://github.com/ttu/dotnet-fake-json-server/releases/download/0.9.1/fakeserver-osx-x64.tar.gz
$ tar -zxvf fakeserver-osx-x64.tar.gz
$ chmod +x FakeServer
$ ./FakeServer

Serve static files

Fake Server can serve static files. Location of files can be absolute or relative to the current location.

$ dotnet run -s/--serve [fullpath/relative path]
# e.g.
$ dotnet run -s build

# Use Fake Server as a global tool
$ fake-server -s/--serve [fullpath/relative path]]
# e.g.
$ fake-server --serve c:\temp\react_app\build
$ fake-server --serve /home/user/app/dist
$ fake-server --serve ./build

When user defines static files, it is assumed that user is serving a single page app and then REST API is not working. If API is needed, start other instance of Fake Server.

Quick example

# List collections (should be empty, if data.json didn't exist before)
$ curl http://localhost:57602/api

# Insert new user
$ curl -H "Content-type: application/json" -X POST -d '{ "name": "Phil", "age": 20, "location": "NY" }' http://localhost:57602/api/users/

# Insert another user
$ curl -H "Content-type: application/json" -X POST -d '{ "name": "James", "age": 40, "location": "SF" }' http://localhost:57602/api/users/

# List users
$ curl http://localhost:57602/api/users

# List users from NY
$ curl http://localhost:57602/api/users?location=NY

# Get User with Id 1
$ curl http://localhost:57602/api/users/1

...

# Add users to data.json manually

# Get all users
$ curl http://localhost:57602/api/users/
...

# Or open url http://localhost:57602/swagger/ with browser and use Swagger

Example project

Redux TodoMVC example modified to use Fake JSON Server as a Back End.

Example queries

Example queries are in Insomnia workspace format in FakeServer_Insomnia_Workspace.json.

Features

Authentication

Fake REST API supports Token and Basic Authentication.

Authentication can be disabled from appsettings.json by setting Enabled to false. AuthenticationType options are token and basic.

Add allowed usernames/passwords to Users-array.

"Authentication": {
  "Enabled": true,
  "AuthenticationType": "token",
  "Users": [
      { "Username": "admin", "Password": "root" }
  ]
}

Token Authentication

API has a token provider middleware which provides an endpoint for token generation /token. Endpoint supports 'content-type: multipart/form-data and content-type: application/json. Username and password must be in username and password fields.

Get token:

# content-type: multipart/form-data
$ curl -X POST -H 'content-type: multipart/form-data' -F username=admin -F password=root http://localhost:57602/token

# content-type: application/json
$ curl -X POST -H 'content-type: application/json' -d '{ "username": "admin", "password": "root" }' http://localhost:57602/token

Token can be fetch also using Client Credentials grant type (see example from Insomnia workspace):

$ curl -X POST -d "grant_type=client_credentials&client_id=admin&client_secret=root" http://localhost:57602/token

Add token to Authorization header:

$ curl -H 'Authorization: Bearer [TOKEN]' http://localhost:57602/api

Token authentication has also a logout functionality. By design tokens do not support token invalidation, so logout is implemented by blacklisting tokens.

$ curl -X POST -d '' -H 'Authorization: Bearer [TOKEN]' http://localhost:57602/logout

The implementation is quite similiar to SimpleTokenProvider and more info on that can be found from GitHub and StormPath's blog post.

Basic Authentication

NOTE: It is not recommended to use Basic Authentication in production as base64 is a reversible encoding

Add base64 encoded username:password to authorization header e.g. 'Authorization: Basic YWRtaW46cm9vdA=='.

$ curl -u admin:root http://localhost:57602/api
# -u argument creates Authorization header with encoded username and password
$ curl -H 'Authorization: Basic YWRtaW46cm9vdA==' http://localhost:57602/api

WebSockets

API will send the latest update's method (POST, PUT, PATCH, DELETE), path, collection and optional item id with WebSocket.

{ "method": "PATCH", "path": "/api/users/2", "collection": "users", "itemId": 2 }

wwwroot\index.html has a WebSocket example.

CORS

CORS is enabled and it allows everything.

Static Files

GET /

Returns static files from wwwroot or defined location. Default file is index.html.

Check how to serve static files from defined location.

Swagger

Swagger is configured to endpoint /swagger and Swagger UI opens when project is started from IDE.

Caching and avoiding mid-air collisions with ETag

Caching can be disabled from appsettings.json by setting ETag.Enabled to false.

"Caching": {
  "ETag": { 
    "Enabled": true 
  }
}

If caching is enabled, ETag is added to response headers.

$ curl -v 'http://localhost:57602/api/users?age=40'
200 OK

Headers:
ETag: "5yZCXmjhk5ozJyTK4-OJkkd_X18"

Caching of unchanged resources

If a request contains the If-None-Match header, the header's value is compared to the response's body and if the value matches to the body's checksum then 304 Not Modified is returned.

$ curl -H "If-None-Match: \"5yZCXmjhk5ozJyTK4-OJkkd_X18\"" 'http://localhost:57602/api/users?age=40'

Avoiding mid-air collisions

If the PUT request contains the If-Match header, the header's value is compared to the item to be updated. If the value matches to the item's checksum then items is updated, else 412 Precondition Failed is returned.

Content Negotiaton

Client can determine what type of representation is desired with Accept header. By default data is returned in JSON (text/json, application/json).

Supported types are JSON, CSV and XML.

text/json
application/json
text/csv
text/xml
application/xml

Get all users in CSV

$ curl -H "Accept: text/csv" http://localhost:57603/api/users

If content types is not supported 406 Not Acceptable is returned.

Routes, Functionalities and Examples

GET      /
POST     /token
POST     /logout
POST     /admin/reload

GET      /api
HEAD     /api
GET      /api/{collection/object}
HEAD     /api/{collection/object}
POST     /api/{collection}
GET      /api/{collection}/{id}
HEAD     /api/{collection}/{id}
PUT      /api/{collection}/{id}
PATCH    /api/{collection}/{id}
DELETE   /api/{collection}/{id}
PUT      /api/{object}
PATCH    /api/{object}
DELETE   /api/{object}
OPTIONS  /api/*

GET      /async/queue/{id}
DELETE   /async/queue/{id}
POST     /async/{collection}
PUT      /async/{collection}/{id}
PATCH    /async/{collection}/{id}
DELETE   /async/{collection}/{id}
OPTIONS  /async/*

POST     /graphql

Collections and objects

Fake JSON Server is designed for prototyping, so by default it supports only resources in a collection.

If the JSON-file has a single object on a root level, then the route from that property is handled like a single object.

{
  "collection": [],
  "object": {}
}

Routes

Dynamic routes are defined by the name of item's collection and id: api/{collection}/{id}. All examples below use users as a collection name.

If /api or /async are needed to change to something different, change ApiRoute or AsyncRoute from Config.cs.

public class Config
{
    public const string ApiRoute = "api";
    public const string AsyncRoute = "async";
    public const string GraphQLRoute = "graphql";
    public const string TokenRoute = "token";
    public const string TokenLogoutRoute = "logout";
}

For example, if api-prefix is not wanted in the route, then remove api from ApiRoute.

public const string ApiRoute = "";
# Query with default route
$ curl 'http://localhost:57602/api/users?skip=5&take=20'
# Query with updated route
$ curl 'http://localhost:57602/users?skip=5&take=20'

Identifiers

id is used as the identifier field. By default Id field's type is integer. POST will always use integer as id field's type.

"users":[
  { "id": 1 }
],
"sensors": [
  { "id": "E:52:F7:B3:65:CC" }
]

If string is used as the identifiers type, then items must be inserted with PUT and UpsertOnPut must be set to true from appsettings.json.

Return codes

Asynchoronous operations follow the REST CookBook guide. Updates will return 202 with location header to queue item. Queue will return 200 while operation is processing and 303 when job is ready with location header to changed or new item.

Method return codes are specified in REST API Tutorial.

OPTIONS method

OPTIONS method will return Allow header with a list of HTTP methods that may be used on the resource.

$ curl -X OPTIONS -v http://localhost:57602/api/
200 OK

Headers:
Allow: GET, POST, OPTIONS

HEAD method

HEAD method can be used to get the metadata and headers without receiving response body.

E.g. get user count without downloading large response body.

$ curl -X HEAD -v http://localhost:57602/api/users
200 OK

Headers:
X-Total-Count: 1249

Data Store Id-field name

Name of the Id-field used by Data Store can be configure from appsettings.json. Default name for the id-field is id.

"DataStore": {
  "IdField": "id"
}

Eager data reload

By default Data Store updates its internal data on every request by reading the data from the JSON file.

EagerDataReload can be configured from appsettings.json.

"DataStore": {
  "EagerDataReload": true
}

For performance reasons EagerDataReload can be changed to false. Then the data is reloaded from the file only when Data Store is initialized and when the data is updated.

If EagerDataReload is false and JSON file is updated manually, reload endpoint must be called if new data will be queried before any updates.

Reload

Reload endpoint can be used to reload JSON data from the file to Data Store. Endpoint is in Admin controller, so it is usable also with Swagger.

$ curl -X POST http://localhost:57602/admin/reload --data ""

Endpoints

Example JSON data

Data used in example requests, unless otherwise stated:

{
  "users": [
    { "id": 1, "name": "Phil", "age": 40, "location": "NY" },
    { "id": 2, "name": "Larry", "age": 37, "location": "London" },
    { "id": 3, "name": "Thomas", "age": 40, "location": "London" }
  ],
  "movies": [],
  "configuration": { "ip": "192.168.0.1" }
}

Example JSON generation guide for data used in unit tests CreateJSON.md.

List collections

> GET /api

200 OK : List of collections

Get all collections.

$ curl http://localhost:57602/api
[ "users", "movies", "configuration" ]

Query

> GET /api/{collection/item}

200 OK          : Collection is found
400 Bad Request : Invalid query parameters
404 Not Found   : Collection is not found or it is empty

By default the request returns results in an array. Headers have the collection's total item count (X-Total-Count) and pagination links (Link).

$ curl http://localhost:57602/api/users
[
  { "id": 1, "name": "Phil", "age": 40, "location": "NY" },
  { "id": 2, "name": "Larry", "age": 37, "location": "London" },
  { "id": 3, "name": "Thomas", "age": 40, "location": "London" },
  ...
]

Headers:
X-Total-Count=20
Link=
<http://localhost:57602/api/users?offset=15&limit=5>; rel="next",
<http://localhost:57602/api/users?offset=15&limit=5>; rel="last",
<http://localhost:57602/api/users?offset=0&limit=5>; rel="first",
<http://localhost:57602/api/users?offset=5&limit=5>; rel="prev"

The return value can also be a JSON object. Set UseResultObject to true from appsettings.json.

"Api": {
  "UseResultObject": true
}

JSON object has items in results array in result field, link object has the pagination info, skip, take and total count fields.

{
  "results": [
    ...
  ],
  "link": {
    "Prev": "http://localhost:57602/api/users?offset=5&limit=5",
    "Next": "http://localhost:57602/api/users?offset=15&limit=5",
    "First": "http://localhost:57602/api/users?offset=0&limit=5",
    "Last": "http://localhost:57602/api/users?offset=15&limit=5"
  },
  "offset": 10,
  "limit": 5,
  "count": 20
}

Single object doesn't support result object. If the endpoint is a single object, only item object is returned.

$ curl http://localhost:57602/api/configuration
{ "ip": "192.168.0.1" }
Slice

Slicing can be defined with skip/take, offset/limit or page/per_page parameters. By default request returns the first 512 items.

Example request returns items from 11 to 20.

# skip and take
$ curl 'http://localhost:57602/api/users?skip=10&take=10'
# offset and limit
$ curl 'http://localhost:57602/api/users?offset=10&limit=10'
# page and per_page
$ curl 'http://localhost:57602/api/users?page=2&per_page=10'
Pagination headers

Link items are optional, so e.g. if requested items are starting from index 0, then the prev and first page link won't be added to the Link header.

Headers follow GitHub Developer guide.

Filter

> GET api/{collection}?field=value&otherField=value

Get all users whose age equals to 40.

$ curl 'http://localhost:57602/api/users?age=40'
[ 
 { "id": 1, "name": "Phil", "age": 40, "location": "NY" },
 { "id": 3, "name": "Thomas", "age": 40, "location": "London" }
]

Sort

> GET api/{collection}?sort=[+/-]field,[+/-]otherField

Sort contains comma-spearetd list of fields defining the sort. Sort direction can be specified with + (ascending) or - (descending, default) prefix.

Get all users sorted by location (descending) and then by age (ascending).

$ curl 'http://localhost:57602/api/users?sort=location,+age'
[
  { "id": 2, "name": "Larry", "age": 37, "location": "London" },
  { "id": 3, "name": "Thomas", "age": 40, "location": "London" },
  { "id": 1, "name": "Phil", "age": 40, "location": "NY" }
]
Child properties

Query can have a path to child properties. Property names are separated by periods.

> GET api/{collection}?parent.child.grandchild.field=value

Example JSON:

[
  {
    "companyName": "ACME",
    "employees": [ 
      { "id": 1, "name": "Thomas", "address": { "city": "London" } }
    ]
  },
  {
    "companyName": "Box Company",
    "employees": [ 
      { "id": 1, "name": "Phil", "address": { "city": "NY" } }
    ]
  }
]

Get all companies which has employees with London in address.city.

$ curl http://localhost:57602/api/companies?employees.address.city=London

Query will return ACME from the example JSON.

[
  {
    "companyName": "ACME",
    "employees": [ 
      { "id": 1, "name": "Thomas", "address": { "city": "London" } }
    ]
  }
]
Filter operators

Query filter can include operators. Operator identifier is added to the end of the field.

> GET api/{collection}?field{operator}=value

=     : Equal to
_ne=  : Not equal
_lt=  : Less than
_gt=  : Greater than
_lte= : Less than or equal to
_gte= : Greater than or equal to

Query users with age less than 40.

$ curl http://localhost:57602/api/users?age_lt=40
[ 
  { "id": 2, "name": "Larry", "age": 37, "location": "London" }
]
Full-text search

Full-text search can be performed with the q-parameter followed by search text. Search is not case sensitive.

> GET api/{collection}?q={text}

Get all users that contain text London in the value of any of it's properties.

$ curl http://localhost:57602/api/users?q=london
Select Fields

Choose which fields to include in the results. Field names are separated by comma.

> GET api/{collection}?fields={fields}

Select age and name from users.

$ curl http://localhost:57602/api/users?fields=age,name
[ 
  { "name": "Phil", "age": 40 },
  { "name": "Larry", "age": 37 }
]

Get item with id

> GET /api/{collection}/{id}

200 OK          : Item is found
400 Bad Request : Collection is not found
404 Not Found   : Item is not found

Get user with id 1.

$ curl http://localhost:57602/api/users/1
{ "id": 1, "name": "Phil", "age": 40, "location": "NY" }

Get nested items

> GET /api/{collection}/{id}/{restOfThePath}

200 OK          : Nested item is found
400 Bad Request : Parent item is not found
404 Not Found   : Nested item is not found

It is possible to request only child objects instead of full item. Path to nested item can contain id field integers and property names.

[
  {
    "id": 0,
    "companyName": "ACME",
    "employees": [ 
      { "id": 1, "name": "Thomas", "address": { "city": "London" } }
    ]
  }
]

Example query will return address object from the employee with id 1 from the company with id 0.

$ curl http://localhost:57602/api/company/0/employees/1/address
{ "address": { "city": "London" } }

Add item

> POST /api/{collection}

201 Created     : New item is created
400 Bad Request : New item is null
409 Conflict    : Collection is an object

Add { "name": "Phil", "age": 40, "location": "NY" } to users.

$ curl -H "Accept: application/json" -H "Content-type: application/json" -X POST -d '{ "name": "Phil", "age": 40, "location": "NY" }' http://localhost:57602/api/users/

Response has new item's id and a Location header that contains the path to the new item.

{ "id": 6 }

Headers:
Location=http://localhost:57602/api/users/6

If collection is empty and new item has an id-field set, it will be used a first id-value. If id-field is not set, id-value will start from 0.

Replace item

> PUT /api/{collection}/{id}

204 No Content  : Item is replaced
400 Bad Request : Item is null
404 Not Found   : Item is not found

Replace user with id 1 with object { "name": "Roger", "age": 28, "location": "SF" }.

$ curl -H "Accept: application/json" -H "Content-type: application/json" -X PUT -d '{ "name": "Roger", "age": 28, "location": "SF" }' http://localhost:57602/api/users/1

Update item

Server supports JSON merge patches.

> PATCH /api/{collection}/{id}

Content-type: application/json+merge-patch or application/merge-patch+json

204 No Content             : Item updated
400 Bad Request            : PATCH is empty
404 Not Found              : Item is not found
415 Unsupported Media Type : Content type is not supported

Set age to 41 and work.rating to 3.2 from user with id 1.

$ curl -H "Accept: application/json" -H "Content-type: application/json+merge-patch" -X PATCH -d '{ "age": "41", "work": { "rating": 3.2 }}' http://localhost:57602/api/users/1
{
  "age": 41,
  "work": {
    "rating": 3.2
  }
}

NOTE:

Due to the limitations of the merge patch, if the patch is anything other than an object, the result will always be to replace the entire target with the entire patch. Also, it is not possible to patch part of a target that is not an object, such as to replace just some of the values in an array.

https://tools.ietf.org/html/rfc7396#section-2

Delete item

> DELETE /api/{collection}/{id}

204 No Content  : Item deleted
404 Not Found   : Item is not found

Delete user with id 1.

$ curl -X DELETE http://localhost:57602/api/users/1

Async Operations

/async endpoint has long running operation for each update operation.

> POST/PUT/PATCH/DELETE /async/{collection}/{id}

202 Accepted    : New job started
400 Bad Request : Job not started

Headers:
Location=http://{url}:{port}/async/queue/{id}

Update operations will return location to job queue in headers.

Create new item. Curl has a verbose flag (-v). When it is used, curl will print response headers among other information.

$ curl -H "Accept: application/json" -H "Content-type: application/json" -X POST -d '{ "name": "Phil", "age": 40, "location": "NY" }' -v http://localhost:57602/async/users/
> GET /async/queue/{id}

200 OK        : Job running
303 See Other : Job ready
404 Not Found : Job not found

Headers:
Location=http://{url}:{port}/api/{collectionId}/{id}

When Job is ready, status code will be redirect See Other. Location header will have modified item's url.

After job is finished, it must be deleted manually

> DELETE /async/queue/{id}

204 No Content : Job deleted
404 Not Found  : Job not found
Job delay

Delay for operations can be set from appsettings.json. With long delay it is easier to simulate long running jobs.

  "Jobs": {
    "DelayMs": 2000
  }

Delay value is milliseconds. Default value is 2000ms.

GraphQL

GraphQL implementation is experimental and supports only basic queries and mutations. At the moment this is a good way to compare simple GraphQL and REST queries. /graphql endpoint accepts requests with application/graphql or application/json content type. If the first, request body is GraphQL query string, whereas if the latter, request body is expected to be a valid JSON with parameter query containing the GraphQL query string.

> POST /graphql

Content-type: application/graphql
Body: [query/mutation]

OR

Content-type: application/json
Body: { "query": "[query/mutation]" }

200 OK              : Query/mutation successful 
400 Bad Request     : Query/mutation contains errors
501 Not Implemented : HTTP method and/or content-type combination not implemented

Alternatively, the /graphql endpoint also supports requests containing a valid GraphQL query as a query query parameter using either a GET or POST request. Queries in the JSON format are not supported as query parameters. Note that in the case of a POST request, the query supplied using the query parameter will take priority over any content in the request body, which will be ignored if the query query parameter is present.

> GET /graphql?query=[query/mutation]

OR

> POST /graphql?query=[query/mutation]

200 OK              : Query/mutation successful 
400 Bad Request     : Query/mutation contains errors
501 Not Implemented : HTTP method and/or content-type combination not implemented

Response is in JSON format. It contains data and errors fields. errors field is not present if there are no errors.

{
  "data": { 
    "users": [ ... ],
    ...
  },
  "errors": [ ... ]
}

Implementation uses graphql-dotnet to parse Abstract Syntax Tree from the query.

Query

Query implementation supports equal filtering with arguments. Query's first field is the name of the collection.

query {
  [collection](filter: value) {
    [field1]
    [field2](filter: value) {
      [field2.1]
    }
    [field3]
  }
}

Implementation accepts queries with operation type, with any query name (which is ignored) and query shorthands.

# Operation type
query {
  users(id: 3) {
    name
    work {
      location
    }
  }
}

# Optional query name
query getUsers {
  users {
    name
    work {
      location
    }
  }
}

# Query shorthand
{
  families {
    familyName
    children(age: 5){
      name
    }
  }
}

Example: get familyName and age of the children from families where id is 1 and namefrom all users.

{
  families(id: 1) {
    familyName
    children {
      age
    }
  }
  users {
    name
  }
}

Execute query with curl:

$ curl -H "Content-type: application/graphql" -X POST -d "{ families(id: 1) { familyName children { age } } users { name } }" http://localhost:57602/graphql

Respose:

{ 
  "data": {
    "families": [ 
      { 
        "familyName": "Day", 
        "children": [ 
          { "age": 14 }, 
          { "age": 18 }, 
          { "age": 9 } 
        ] 
      }
    ],
    "users": [ 
      { "name": "James" }, 
      { "name": "Phil" }, 
      { "name": "Raymond" }, 
      { "name": "Jarvis" } 
    ] 
  }
}

Mutation

Fake JSON Server supports dynamic mutations with the format defined below:

mutation {
  [mutationName](input: {
    [optional id]
    [itemData/patch]
    }) {
      [collection]{
        [fields]
    }
}

Action is decided from the mutation name. Name follows pattern add|update|replace|delete[collection] E.g. deleteUsers will delete an item from the users collection. Input object has an optional id-field and update data object. Return data is defined the same way as in queries.

Add item

add{collection}

Input contains object to be added with the collection's name.

mutation {
  addUsers(input: {
    users: {
      name: James
      work: {
        name: ACME
      }
    }
  }) {
    users {
      id
      name 
    }
  }
}

Execute mutation with curl:

$ curl -H "Content-type: application/graphql" -X POST -d "mutation { addUsers(input: { users: { name: James work: { name: ACME } } }) { users { id name } } }" http://localhost:57602/graphql

Response:

{ 
  "data": {
    "users":{
      "id": 12,
      "name": "James"
    }
  }
}

Update Item

update{collection}

mutation {
  updateUsers(input: {
    id: 2
    patch:{
      name: Timothy
    }
  }) {
    users {
      id
      name 
    }
  }
}

Execute mutation with curl:

$ curl -H "Content-type: application/graphql" -X POST -d "mutation { updateUsers(input: { id: 2 patch:{ name: Timothy } }) { users { id name age }}}" http://localhost:57602/graphql

Response:

{ 
  "data": { 
    "users": { 
      "id": 2, 
      "name": "Timothy", 
      "age": 25 
    } 
  } 
}

NOTE: Update doesn't support updating child arrays

Replace item

replace{collection}

Input must contain id of the item to be replacecd and items full data in object named with collection's name.

mutation {
  replaceUsers(input: {
    id: 5
    users:{
      name: Rick
      age: 44
      workplace: {
       companyName: ACME 
      }
    }
  }) {
    users {
      id
      name
      age
    }
  }
}

Execute mutation with curl:

$ curl -H "Content-type: application/graphql" -X POST -d "mutation { replaceUsers(input: { id: 1 users: { name: Rick age: 44 workplace: { name: ACME } } }) {users {id name age}}}" http://localhost:57602/graphql

Response:

{
  "data": {
    "users": {"
      id": 1,
      "name": "Rick",
      "age": 44
    }
  }
}
Delete item

delete{collection}

Delete requires only the id of item to be deleted. Response will only contain success boolean true/false, so mutation doesn't need any definition for return data.

mutation {
  deleteUsers(input: {
    id: 4
  })
}

Execute mutation with curl:

$ curl -H "Content-type: application/graphql" -X POST -d "mutation { deleteUsers(input: { id: 4 }) }" http://localhost:57602/graphql

Response:

{
  "data": {
    "Result": true
  }
}

Simulate Delay and Random Errors

Delay and errors can be configured from appsettings.json.

Delay can be simulated by setting Simulate.Delay.Enabled to true. The inbound request is delayed. The length of the delay is randomly chosen between MinMsand MaxMs. Delay can be configured for only certain HTTP Methods, e.g. only POST updates have delay and all GET requests are handled normally.

"Simulate": {
    "Delay": {
      "Enabled": true,
      "Methods": [ "GET", "POST", "PUT", "PATCH", "DELETE" ],
      "MinMs": 2000,
      "MaxMs": 5000
    }
}

Random errors can be simulated by setting Simulate.Error.Enabled to true. Error is thrown if set Probability is greater or equal to randomly chosen value between 1 and 100. Error can be configured for only certain HTTP Methods.

"Simulate": {
    "Error": {
      "Enabled": true,
      "Methods": [ "POST", "PUT", "PATCH", "DELETE" ],
      "Probability": 50
    }
}

Error simulation is always skipped for Swagger, WebSocket (ws) and for any html file.

Custom Response Transformation

Fake Server has a custom response middleware to transform reponse body with C#-scripts.

Multiple scripts can be configured and if path matches multiple scipts, last match will be used.

"CustomResponse": {
    "Enabled": true,
    "Scripts": [
        {
            "Script": "return new { Data = _Body, Success = _Context.Response.StatusCode == 200 };",
            "Methods": [ "GET" ],
            "Paths": [ "api" ],
            "Usings": [ "System", "Microsoft.AspNetCore.Http" ],
            "References": [ "Microsoft.AspNetCore" ]
        },
        {
            "Script": "return new { Data = \"illegal operation\" };",
            "Methods": [ "GET" ],
            "Paths": [ "api/users" ],
            "Usings": [ "System", "Microsoft.AspNetCore.Http" ],
            "References": [ "Microsoft.AspNetCore" ]
      }
    ]
}

C# code is executed as a csscript and it has some special reacy processed objects.

// HttpContext
public HttpContext _Context;
// Collection id parsed from the Request path
public string _CollectionId;
// Original Response Body encoded to string
public string _Body;
// Request Http Method
public string _Method;

Example script creates new anonymous object

return new { Data = _Body, Success = _Context.Response.StatusCode == 200 };

Previous script will have a response body:

{
  "Data": [
    { "id": 1, "name": "James" ...},
    { "id": 2, "name": "Phil", ... },
    ...
  ],
  "Success": true
}

If response data requires so dynamically named properties, e.g. users in the example, then response requires more complex processing.

{
  "Data": {
    "users": [
      { "id": 1, "name": "James" ...},
      { "id": 2, "name": "Phil", ... },
      ...
    ]
  },
  "Success": true
}

C#-code for the processing would be following:

var data = new ExpandoObject();
var dataItems = data as IDictionary<string, object>;
dataItems.Add(_CollectionId, _Body);

var body = new ExpandoObject();
var items = body as IDictionary<string, object>;
items.Add("Data", data);
items.Add("Success", _Context.Response.StatusCode == 200);
return body;

Script also would need System.Collections.Generic and System.Dynamic as imports.

{
    "Script": "var data = new ExpandoObject();var dataItems = data as IDictionary<string, object>;dataItems.Add(_CollectionId, _Body);var body = new ExpandoObject();var items = body as IDictionary<string, object>;items.Add(\"Data\", data);items.Add(\"Success\", _Context.Response.StatusCode == 200);return body;",
    "Methods": [ "GET" ],
    "Paths": [ "api" ],
    "Usings": [ "System", "System.Dynamic", "System.Collections.Generic", "Microsoft.AspNetCore.Http" ],
    "References": [ "Microsoft.AspNetCore" ]
}

Logging

Fake JSON Server writes a log file to the application base path (execution folder).

Console logging can be enabled from appsettings.json by adding a new item to Serilog.WriteTo-array.

"Serilog": {
  "WriteTo": [
    { "Name": "File" },
    { "Name": "Console" }
  ]
}

Guidelines

API follows best practices and recommendations from these guides:

Other Links

Releases

Releases are marked with Tag and can be found from Releases.

Changelog

Changelog

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

License

Licensed under the MIT License.

About

Fake JSON Server is a Fake REST API that can be used as a Back End for prototyping or as a template for a CRUD Back End.

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