Fetch Account Records Using Rest Api in Salesforce

Hi Vikas,

The following example may help you:

global class TestRESTAPI{

global void authenticateAPI(){

httprequest req = new httprequest();
http testHttp = new http();

req.setMethod('GET');
req.setEndPoint('https://login.salesforce.com/services/oauth2/token');
req.setBody('grant_type=password&client_id=3MVG9ZL0ppGP5UrBUp_MAQLjBuF1yI1xECRabWZ8No_gyZ4WF3HVrSDyMTTxN13GWhhhrH2Sqg84AsVR3Y0ib&client_secret=9013832611733751894&[email protected]&password=Test@1234');
HttpResponse res = testHttp.send(req);
System.debug(res.getBody());
}

global void getAccounts(){

httprequest req = new httprequest();
http testHttp = new http();

req.setMethod('GET');
req.setEndPoint('https://ap2.salesforce.com/services/data/v38.0/sobjects/Contact');
req.setHeader('Authorization','OAuth 00D28000001yTWP!AQwAQMPFnsn66o3QnIG.vRfAwkPm1bBVumQlEB4rK.ywUQFzlfx6bvhLIH5XH18ilDT7CxD9o5Bu_kql4fN4r0J06Wj7N7rv');
HttpResponse res = testHttp.send(req);
System.debug(res.getBody());
}
global void postvalue(){
httprequest req=new httprequest();
http testHttp=new http();
req.setMethod('POST');
req.setEndPoint('https://ap2.salesforce.com/services/data/v38.0/sobjects/Account');
req.setHeader('Authorization','OAuth 00D28000001yTWP!AQwAQD0UJZIVUyvnBXkNck7RN9TOqY0swbTwAlL2xjefUKrHqBqwN43yxnT26ghfUzGu82Zmy.oBKW2tn.UoheV9A7A9dZeu');
req.setHeader('Content-Type', 'application/json');
req.setBody('{"name" : "FromSushant"}');
HttpResponse res=testHttp.send(req);
System.debug(res.getBody());
}
}

Thanks