diff --git a/src/base.ts b/src/base.ts
index 3dc1767..a6600cd 100644
--- a/src/base.ts
+++ b/src/base.ts
@@ -14,6 +14,8 @@ export abstract class BlockchainCommand extends Command {
       default: "testnet",
     }),
   };
+
+  static enableJsonFlag = true;
 }
 
 export abstract class TransactionCommand extends BlockchainCommand {
diff --git a/src/commands/node/list.ts b/src/commands/node/list.ts
index 67f6a87..dc981d3 100644
--- a/src/commands/node/list.ts
+++ b/src/commands/node/list.ts
@@ -15,8 +15,9 @@ export default class NodeList extends BlockchainCommand {
     page: Flags.integer({ description: "The contract call paging size.", helpValue: "N", default: 100 }),
   };
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>[]> {
     const { flags } = await this.parse(NodeList);
+
     const provider = await getProvider(flags.network);
     const nodes = await getContract(flags.network, "nodes", provider);
     const operatorId = normalizeHex(flags.operator);
@@ -24,6 +25,10 @@ export default class NodeList extends BlockchainCommand {
     const results: Result[] = await getAll(flags.page, async (i, n) => {
       return await nodes.getNodes(operatorId, flags.topology, i, n, { blockTag });
     });
-    console.log(normalizeRecords(results.slice(flags.skip, flags.skip + flags.size)));
+    const records = results.slice(flags.skip, flags.skip + flags.size);
+
+    const output = normalizeRecords(records);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/node/show.ts b/src/commands/node/show.ts
index 781aea2..1aeb74d 100644
--- a/src/commands/node/show.ts
+++ b/src/commands/node/show.ts
@@ -8,12 +8,16 @@ export default class NodeShow extends BlockchainCommand {
   static usage = "<%= command.id %> ID";
   static args: Arg[] = [{ name: "ID", description: "The ID of the node to show.", required: true }];
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>> {
     const { args, flags } = await this.parse(NodeShow);
+
     const provider = await getProvider(flags.network);
     const nodes = await getContract(flags.network, "nodes", provider);
     const nodeId = normalizeHex(args.ID);
     const record = await nodes.getNode(nodeId);
-    console.log(normalizeRecord(record));
+
+    const output = normalizeRecord(record);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/project/content.ts b/src/commands/project/content.ts
index ada0dbf..645686d 100644
--- a/src/commands/project/content.ts
+++ b/src/commands/project/content.ts
@@ -17,7 +17,7 @@ export default class ProjectContent extends TransactionCommand {
     { name: "SHA", description: "The SHA-256 checksum of the bundle." },
   ];
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>> {
     const { args, flags } = await this.parse(ProjectContent);
     if (args.URL === undefined || args.SHA === undefined) {
       this.error("URL and SHA must be specified");
@@ -30,11 +30,14 @@ export default class ProjectContent extends TransactionCommand {
     CliUx.ux.action.start("- Submitting transaction");
     const tx = await projects.setProjectContent(projectId, args.URL, bundleSha);
     CliUx.ux.action.stop("done");
-    console.log(`> ${getTxUrl(tx)}`);
+    this.log(`> ${getTxUrl(tx)}`);
     CliUx.ux.action.start("- Processing transaction");
     const receipt = await tx.wait();
     CliUx.ux.action.stop("done");
     const event = await decodeEvent(receipt, projects, "ProjectContentChanged");
-    console.log(normalizeRecord(event));
+
+    const output = normalizeRecord(event);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/project/create.ts b/src/commands/project/create.ts
index cf1d4e5..97d8768 100644
--- a/src/commands/project/create.ts
+++ b/src/commands/project/create.ts
@@ -17,7 +17,7 @@ export default class ProjectCreate extends TransactionCommand {
     owner: Flags.string({ description: "[default: caller] The owner for the new project.", helpValue: "ADDR" }),
   };
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>> {
     const { args, flags } = await this.parse(ProjectCreate);
     if (!!args.URL !== !!args.SHA) {
       this.error("URL and SHA must be specified together");
@@ -30,11 +30,14 @@ export default class ProjectCreate extends TransactionCommand {
     CliUx.ux.action.start("- Submitting transaction");
     const tx = await projects.createProject([owner, args.NAME, args.EMAIL, args.URL, bundleSha]);
     CliUx.ux.action.stop("done");
-    console.log(`> ${getTxUrl(tx)}`);
+    this.log(`> ${getTxUrl(tx)}`);
     CliUx.ux.action.start("- Processing transaction");
     const receipt = await tx.wait();
     CliUx.ux.action.stop("done");
     const event = await decodeEvent(receipt, projects, "ProjectCreated");
-    console.log(normalizeRecord(event));
+
+    const output = normalizeRecord(event);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/project/delete.ts b/src/commands/project/delete.ts
index 087eb03..d58916e 100644
--- a/src/commands/project/delete.ts
+++ b/src/commands/project/delete.ts
@@ -9,19 +9,23 @@ export default class ProjectDelete extends TransactionCommand {
   static usage = "<%= command.id %> ID";
   static args: Arg[] = [{ name: "ID", description: "The ID of the project to delete.", required: true }];
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>> {
     const { args, flags } = await this.parse(ProjectDelete);
+
     const signer = await getSigner(flags.network, flags.address, flags.signer);
     const projects = await getContract(flags.network, "projects", signer);
     const projectId = normalizeHex(args.ID);
     CliUx.ux.action.start("- Submitting transaction");
     const tx = await projects.deleteProject(projectId);
     CliUx.ux.action.stop("done");
-    console.log(`> ${getTxUrl(tx)}`);
+    this.log(`> ${getTxUrl(tx)}`);
     CliUx.ux.action.start("- Processing transaction");
     const receipt = await tx.wait();
     CliUx.ux.action.stop("done");
     const event = await decodeEvent(receipt, projects, "ProjectDeleted");
-    console.log(normalizeRecord(event));
+
+    const output = normalizeRecord(event);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/project/list.ts b/src/commands/project/list.ts
index 1e6b527..67fd40d 100644
--- a/src/commands/project/list.ts
+++ b/src/commands/project/list.ts
@@ -14,8 +14,9 @@ export default class ProjectList extends BlockchainCommand {
     page: Flags.integer({ description: "The contract call paging size.", helpValue: "N", default: 100 }),
   };
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>[]> {
     const { flags } = await this.parse(ProjectList);
+
     const provider = await getProvider(flags.network);
     const projects = await getContract(flags.network, "projects", provider);
     const owner = normalizeHex(flags.owner);
@@ -26,6 +27,9 @@ export default class ProjectList extends BlockchainCommand {
     if (flags.owner) {
       results = results.filter((v) => v.owner.toLowerCase() === owner.toLowerCase());
     }
-    console.log(normalizeRecords(results.slice(flags.skip, flags.skip + flags.size)));
+
+    const output = normalizeRecords(results.slice(flags.skip, flags.skip + flags.size));
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/project/owner.ts b/src/commands/project/owner.ts
index 8ce01e0..912d912 100644
--- a/src/commands/project/owner.ts
+++ b/src/commands/project/owner.ts
@@ -13,19 +13,23 @@ export default class ProjectOwner extends TransactionCommand {
     { name: "ADDR", description: "The address of the new project owner.", required: true },
   ];
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>> {
     const { args, flags } = await this.parse(ProjectOwner);
+
     const signer = await getSigner(flags.network, flags.address, flags.signer);
     const projects = await getContract(flags.network, "projects", signer);
     const projectId = normalizeHex(args.ID);
     CliUx.ux.action.start("- Submitting transaction");
     const tx = await projects.setProjectOwner(projectId, args.ADDR);
     CliUx.ux.action.stop("done");
-    console.log(`> ${getTxUrl(tx)}`);
+    this.log(`> ${getTxUrl(tx)}`);
     CliUx.ux.action.start("- Processing transaction");
     const receipt = await tx.wait();
     CliUx.ux.action.stop("done");
     const event = await decodeEvent(receipt, projects, "ProjectOwnerChanged");
-    console.log(normalizeRecord(event));
+
+    const output = normalizeRecord(event);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/project/props.ts b/src/commands/project/props.ts
index 32249b1..762a490 100644
--- a/src/commands/project/props.ts
+++ b/src/commands/project/props.ts
@@ -13,8 +13,9 @@ export default class ProjectProps extends TransactionCommand {
     { name: "EMAIL", description: "The new email for admin notifications.", required: true },
   ];
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>> {
     const { args, flags } = await this.parse(ProjectProps);
+
     const signer = await getSigner(flags.network, flags.address, flags.signer);
     const projects = await getContract(flags.network, "projects", signer);
     const projectId = normalizeHex(args.ID);
@@ -26,6 +27,9 @@ export default class ProjectProps extends TransactionCommand {
     const receipt = await tx.wait();
     CliUx.ux.action.stop("done");
     const event = await decodeEvent(receipt, projects, "ProjectPropsChanged");
-    console.log(normalizeRecord(event));
+
+    const output = normalizeRecord(event);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/project/show.ts b/src/commands/project/show.ts
index d9e51e6..23ae663 100644
--- a/src/commands/project/show.ts
+++ b/src/commands/project/show.ts
@@ -8,12 +8,16 @@ export default class ProjectShow extends BlockchainCommand {
   static usage = "<%= command.id %> ID";
   static args: Arg[] = [{ name: "ID", description: "The ID of the project to show.", required: true }];
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>> {
     const { args, flags } = await this.parse(ProjectShow);
+
     const provider = await getProvider(flags.network);
     const projects = await getContract(flags.network, "projects", provider);
     const projectId = normalizeHex(args.ID);
     const record = await projects.getProject(projectId);
-    console.log(normalizeRecord(record));
+
+    const output = normalizeRecord(record);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/reservation/create.ts b/src/commands/reservation/create.ts
index 1f79b40..707a1e3 100644
--- a/src/commands/reservation/create.ts
+++ b/src/commands/reservation/create.ts
@@ -19,7 +19,7 @@ export default class ReservationCreate extends TransactionCommand {
     norenew: Flags.boolean({ description: "Don't renew these reservations in next epoch." }),
   };
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>[]> {
     const { args, flags, raw } = await this.parse(ReservationCreate);
     if (!flags.spot && !!flags.norenew) {
       this.error("--norenew requires --spot");
@@ -37,14 +37,16 @@ export default class ReservationCreate extends TransactionCommand {
     const prices = nodeIds.map(() => parseUnits("1", 18));
     CliUx.ux.action.start("- Submitting transaction");
     const slot = { last: !!flags.spot, next: !flags.norenew };
-    console.log([projectId, nodeIds, prices, slot]);
     const tx = await reservations.createReservations(projectId, nodeIds, prices, slot);
     CliUx.ux.action.stop("done");
-    console.log(`> ${getTxUrl(tx)}`);
+    this.log(`> ${getTxUrl(tx)}`);
     CliUx.ux.action.start("- Processing transaction");
     const receipt = await tx.wait();
     CliUx.ux.action.stop("done");
     const events = await decodeEvents(receipt, reservations, "ReservationCreated");
-    console.log(normalizeRecords(events));
+
+    const output = normalizeRecords(events);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/reservation/delete.ts b/src/commands/reservation/delete.ts
index 4a11875..ebfd373 100644
--- a/src/commands/reservation/delete.ts
+++ b/src/commands/reservation/delete.ts
@@ -14,7 +14,7 @@ export default class ReservationDelete extends TransactionCommand {
     { name: "IDS", description: "The IDs of the nodes to release from the project.", required: true },
   ];
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>[]> {
     const { args, flags, raw } = await this.parse(ReservationDelete);
     // Parse vararg IDS
     const nodeIds = raw
@@ -30,11 +30,14 @@ export default class ReservationDelete extends TransactionCommand {
     const slot = { last: false, next: true };
     const tx = await reservations.deleteReservations(projectId, nodeIds, slot);
     CliUx.ux.action.stop("done");
-    console.log(`> ${getTxUrl(tx)}`);
+    this.log(`> ${getTxUrl(tx)}`);
     CliUx.ux.action.start("- Processing transaction");
     const receipt = await tx.wait();
     CliUx.ux.action.stop("done");
     const events = await decodeEvents(receipt, reservations, "ReservationDeleted");
-    console.log(normalizeRecords(events));
+
+    const output = normalizeRecords(events);
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/commands/reservation/list.ts b/src/commands/reservation/list.ts
index 9ac72ff..4d36765 100644
--- a/src/commands/reservation/list.ts
+++ b/src/commands/reservation/list.ts
@@ -15,8 +15,9 @@ export default class ReservationList extends BlockchainCommand {
     page: Flags.integer({ description: "The contract call paging size.", helpValue: "N", default: 100 }),
   };
 
-  public async run(): Promise<void> {
+  public async run(): Promise<Record<string, unknown>[]> {
     const { args, flags } = await this.parse(ReservationList);
+
     const provider = await getProvider(flags.network);
     const reservations = await getContract(flags.network, "reservations", provider);
     const projectId = normalizeHex(args.ID);
@@ -24,6 +25,9 @@ export default class ReservationList extends BlockchainCommand {
     const results: Result[] = await getAll(flags.page, async (i, n) => {
       return await reservations.getReservations(projectId, i, n, { blockTag });
     });
-    console.log(normalizeRecords(results.slice(flags.skip, flags.skip + flags.size)));
+
+    const output = normalizeRecords(results.slice(flags.skip, flags.skip + flags.size));
+    if (!flags.json) console.log(output);
+    return output;
   }
 }
diff --git a/src/helpers.ts b/src/helpers.ts
index 6f8b3c3..17d0b4e 100644
--- a/src/helpers.ts
+++ b/src/helpers.ts
@@ -27,10 +27,7 @@ export function normalizeRecord(r: Record<string, unknown> | Result): Record<str
     Object.keys(r)
       .filter((k) => isNaN(Number(k)))
       .map((k) => {
-        if (r[k] instanceof BigNumber) {
-          return [k, normalizeBigNumber(r[k])];
-        }
-        return [k, r[k]];
+        return [k, normalizeRecordValue(r[k])];
       })
   );
 }
@@ -39,6 +36,16 @@ export function normalizeRecords(rs: (Record<string, unknown> | Result)[]): Reco
   return rs.map((r) => normalizeRecord(r));
 }
 
+function normalizeRecordValue(val: unknown): unknown {
+  if (Array.isArray(val)) {
+    return val.map(normalizeRecordValue);
+  }
+  if (val instanceof BigNumber) {
+    return normalizeBigNumber(val);
+  }
+  return val;
+}
+
 // Prepends 0x, and replaces undefined and empty with 256-bit zero hash.
 export function normalizeHex(s: string | undefined): string {
   if (!s?.length) {