certificate-api/README.md

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# Certificate API
## Library of Code sp-us | Board of Directors
This is an HTTP API which provides information on the x509 certificates deployed on TLS sites.
You can self-host this yourself, however you're more than welcome to use the public API at https://certapi.libraryofcode.org/
### How to Query
Send a GET request to `https://certapi.libraryofcode.org` with the query parameter `q` set to equal the site you wish to dial.
Ex: `https://certapi.libraryofcode.org/?q=www.google.com`
### Response & Types
#### Error
If the status !== `true`, there will be a message field which displays the error.
```ts
{
status: false,
message: string,
}
```
### 200 | SUCCESS
```ts
{
status: true | false,
subject: {
commonName: string,
organization: string[],
organizationalUnit: string[],
locality: string[],
country: string[],
},
issuer: {
commonName: string,
organization: string[],
organizationalUnit: string[],
locality: string[],
country: string[],
},
validationType: 'DV' | 'OV' | 'EV',
signatureAlgorithm: string,
publicKeyAlgorithm: string,
serialNumber: number,
notAfter: Date,
extendedKeyUsage: ['All/Any Usages', 'TLS Web Server Authentication', 'TLS Web Client Authentication', 'Code Signing', 'E-mail Protection (S/MIME)'],
san: string,
fingerprint: string,
}
```