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https://github.com/actix/examples
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8f3ce39d05
* Add JSON decode error example * cargo fmt * Use more appropriate response codes * curl -i similar for all examples * Add one more example of 422 response * use to_string instead of empty format!
76 lines
1.8 KiB
Markdown
76 lines
1.8 KiB
Markdown
# JSON decode errors
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This example demonstrates how to return useful error messages to the client
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when the server receives a request with invalid JSON, or which cannot be
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deserialized to the expected model. By configuring an `error_handler` on the
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route, we can set appropriate response codes and return the string
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representation of the error.
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## Usage
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```shell
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cd examples/json_decode_error
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cargo run
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# Started HTTP server: 127.0.0.1:8088
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```
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## Examples
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The examples use `curl -i` in order to show the status line with the response
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code. The response headers have been omitted for brevity, and replaced with an
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ellipsis `...`.
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- A well-formed request
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```shell
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$ curl -i 127.0.0.1:8088 -H 'Content-Type: application/json' -d '{"name": "Alice"}'
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HTTP/1.1 200 OK
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...
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Hello Alice!
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```
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- Missing `Content-Type` header
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```shell
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$ curl -i 127.0.0.1:8088 -d '{"name": "Bob"}'
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HTTP/1.1 415 Unsupported Media Type
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...
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Content type error
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```
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- Malformed JSON
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```shell
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$ curl -i 127.0.0.1:8088 -H 'Content-Type: application/json' -d '{"name": "Eve}'
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HTTP/1.1 400 Bad Request
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...
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Json deserialize error: EOF while parsing a string at line 1 column 14
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```
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- JSON value of wrong type
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```shell
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$ curl -i 127.0.0.1:8088 -H 'Content-Type: application/json' -d '{"name": 350}'
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HTTP/1.1 422 Unprocessable Entity
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...
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Json deserialize error: invalid type: integer `350`, expected a string at line 1 column 12
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```
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- Wrong JSON key
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```shell
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$ curl -i 127.0.0.1:8088 -H 'Content-Type: application/json' -d '{"namn": "John"}'
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HTTP/1.1 422 Unprocessable Entity
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...
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Json deserialize error: missing field `name` at line 1 column 16
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```
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## More documentation
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[`actix_web::web::JsonConfig`](https://docs.rs/actix-web/latest/actix_web/web/struct.JsonConfig.html)
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