NEO•ONE has first-class integration with Angular applications.

Integrating NEO•ONE with Angular is a breeze using the generated NEO•ONE client APIs.

Generated Code

The NEO•ONE toolchain emits an Angular Service that aids in integrating an Angular application with NEO•ONE: ContractsService.


The ContractsService can be injected into any component or service in which you need access to the client APIs or smart contract methods.

import { Component } from '@angular/core';
import { ContractsService } from './neo-one';

  selector: 'app-test-component',
  templateUrl: './test-component.component.html',
  styleUrls: ['./test-component.component.css'],
export class TestComponent implements OnInit {
  constructor(private contractsService: ContractsService) {}

  onWithdraw(): void {
      // update something

The ContractsService makes responding to updates in the blockchain easy by providing access to Observables. Here’s how you might use the ContractsService to build a simple Angular component to update the current block count.

import { Component, OnInit } from '@angular/core';
import { ContractsService } from './neo-one';

  selector: 'block-counter-component',
  templateUrl: './block-counter.component.html',
  styleUrls: ['./block-counter.component.css'],
export class BlockCounter implements OnInit {
  blockCount: number;

  constructor(private contractsService: ContractsService) {
    this.blockCount = 0;

  ngOnInit() {

  getBlocks(): void {
    this.contractsService.client.block$.subscribe((block) => {
      this.blockCount = block.block.index;

Important Notes

  • For the smoothest experience using NEO•ONE with Angular 6+, you should use the browserified version of NEO•ONE. This version of NEO•ONE replaces Node.js builtin modules with their browser compatible shims. To use this version, you simply need to import any NEO•ONE client modules with the -browserify suffix. So, @neo-one/client is imported as @neo-one/client-browserify.
  • allowSyntheticDefaultImports must be set to true in the top level tsconfig.json.
  • (window as any).global = window; must be added in the polyfill.ts file.
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