nomoat / GiantJSON Viewer+ / Alternatives

Alternatives to GiantJSON Viewer+

GiantJSON Viewer+: Android app that opens multi-gigabyte JSON, CBOR and MsgPack files, analyses HAR logs and sends API requests, all offline. Here are 5 other products that do a similar job. Of these, 4 have a free plan.

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  Chapar

  Offline desktop app for sending and testing REST, gRPC, GraphQL and WebSocket requests, with scripting and CI tests.

  Since 2024

  Free · Developer tools · Developers

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  Echolon

  Open-source API client that keeps collections as local files synced through Git, for testing REST and WebSocket APIs offline.

  Free plan · Developer tools · Developers

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  Yaak

  A desktop app for sending and testing REST, GraphQL, gRPC and WebSocket requests, stored locally and synced through Git.

  Since 2025

  Subscription · Developer tools · Developers

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  Mockfly

  Frontend teams can spin up hosted fake REST endpoints, import OpenAPI or Postman files, and fill responses with fake data.

  Free plan · Developer tools · Developers

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  Routebase

  Keeps API specs, mock servers, tests and published docs in step from a single spec, for software teams.

  Since 2026

  Free plan · Developer tools · Developers