fix fragment json formatting object keys

packages/abi/src.ts/fragments.ts

@@ -817,10 +817,10 @@ export class FunctionFragment extends ConstructorFragment {
                 name: this.name,
                 constant: this.constant,
                 stateMutability: ((this.stateMutability !== "nonpayable") ? this.stateMutability: undefined),
-                payble: this.payable,
+                payable: this.payable,
                 gas: (this.gas ? this.gas.toNumber(): undefined),
                 inputs: this.inputs.map((input) => JSON.parse(input.format(format))),
-                ouputs: this.outputs.map((output) => JSON.parse(output.format(format))),
+                outputs: this.outputs.map((output) => JSON.parse(output.format(format))),
             });
         }
 

packages/ethers/dist/ethers.esm.js

@@ -5536,10 +5536,10 @@ class FunctionFragment extends ConstructorFragment {
                 name: this.name,
                 constant: this.constant,
                 stateMutability: ((this.stateMutability !== "nonpayable") ? this.stateMutability : undefined),
-                payble: this.payable,
+                payable: this.payable,
                 gas: (this.gas ? this.gas.toNumber() : undefined),
                 inputs: this.inputs.map((input) => JSON.parse(input.format(format))),
-                ouputs: this.outputs.map((output) => JSON.parse(output.format(format))),
+                outputs: this.outputs.map((output) => JSON.parse(output.format(format))),
             });
         }
         let result = "";

packages/ethers/dist/ethers.umd.js

@@ -5774,10 +5774,10 @@
 	                name: this.name,
 	                constant: this.constant,
 	                stateMutability: ((this.stateMutability !== "nonpayable") ? this.stateMutability : undefined),
-	                payble: this.payable,
+	                payable: this.payable,
 	                gas: (this.gas ? this.gas.toNumber() : undefined),
 	                inputs: this.inputs.map(function (input) { return JSON.parse(input.format(format)); }),
-	                ouputs: this.outputs.map(function (output) { return JSON.parse(output.format(format)); }),
+	                outputs: this.outputs.map(function (output) { return JSON.parse(output.format(format)); }),
 	            });
 	        }
 	        var result = "";

packages/tests/src.ts/test-contract-interface.ts

@@ -270,6 +270,14 @@ describe('Test Interface Signatures', function() {
         })
     });
 
+    it('formatted json output should contain correct keys', function() {
+        let iface = new ethers.utils.Interface([ "function balanceOf(address) view returns (uint256)" ])
+        let parsed = JSON.parse(iface.format('json') as string)[0];
+        ['type', 'name', 'constant', 'stateMutability', 'payable', 'inputs', 'outputs'].forEach(function(key) {
+            assert.ok(parsed.hasOwnProperty(key), "json output has key - " + key);
+        })
+    });
+
     it('derives correct description for human-readable ABI', function() {
         let iface = new ethers.utils.Interface([ "function transfer(address from, uint amount)" ]);
         [