I Got Tired of Googling Epoch Timestamps. So I Built This.

A free tool that converts every Unix timestamp inside your JSON — automatically, in one click.

It’s 2am. You’re deep in a production debug session.

You pull a JSON response from the API and see this:

{
  "user": "alice",
  "created_at": 1714000000,
  "last_login": 1714000000000,
  "event_time": 1714000000000000000
}

You stare at 1714000000. Is that today? Last week? 1987?

You open a new tab. Google “epoch converter”. Paste the number. Get a date. Switch back. Grab the next number. Repeat.

Twenty times.

Every developer who works with APIs, logs, or databases has been here. It’s one of those small, repetitive frustrations that quietly eats up your time — right when you can least afford it.

Why I Built This

I’ve hit this problem hundreds of times debugging microservices. JSON payloads with four, five, six timestamp fields — all raw epoch values, all different precisions — and me bouncing between browser tabs like it’s 2009.

I built **JSON Epoch Converter** over a weekend. It converts every epoch timestamp inside your JSON in a single click — no tab-switching, no manual extraction, no copy-paste loop.

It’s been sitting in my bookmarks for months. Figured it’s time to share it.

The Real Problem With Epoch Timestamps

Epoch timestamps are the industry standard for storing time — compact, timezone-neutral, machine-friendly. That’s why every major API, database, and logging system uses them.

But they have one serious flaw: they are completely unreadable to humans.

The pain multiplies fast when you have:

• Multiple timestamp fields — a single API response can have created_at, updated_at, last_seen, expires_at, all as raw epoch values
• Mixed precisions — one field in seconds, another in milliseconds, another in nanoseconds. Yes, this happens in real production systems
• Timezone requirements — you need to know what 1714000000 means in IST or PST, not just UTC
• Large payloads — log dumps and data exports with hundreds or thousands of JSON lines

Most tools online solve only part of this. They convert one number at a time. You still have to extract each value manually, convert it, and mentally map it back.

JSON Epoch Converter solves the whole problem at once.

How It Works — Three Steps

Step 1 — Paste or Upload Your JSON

Paste directly into the editor. Or if you have a large file — a log dump, an API export, a database snapshot — drag and drop it onto the panel or click Upload JSON.

Files up to 50MB are supported.

Step 2 — Click Transform

The tool scans the entire JSON structure — including deeply nested objects and arrays — and identifies every numeric value that looks like an epoch timestamp.

No configuration. No field mapping. No setup.

The part most converters get wrong — mixed precisions.

Modern systems don’t all use the same timestamp precision:

Precision Digits Example Seconds 10 1714000000 Milliseconds 13 1714000000000 Microseconds 16 1714000000000000 Nanoseconds 19 1714000000000000000

JSON Epoch Converter detects the precision of each field automatically and converts it correctly. Whether your distributed tracing system logs in nanoseconds or your REST API returns milliseconds — it just works.

Step 3 — Get the Output

The transformed JSON appears instantly, with every epoch value replaced by a human-readable date. You can then:

• Copy — copies the full output to clipboard in one click
• Download — saves it as a .json file
• Navigate — expand and collapse nested structures with the interactive tree view

A Real-World Example

Here’s an order event from a typical e-commerce backend. Four timestamp fields. Three different precisions. One nested inside metadata.

Before:

{
  "order_id": "ORD-9821",
  "customer": "alice@example.com",
  "placed_at": 1714000000,
  "confirmed_at": 1714003600000,
  "shipped_at": 1714090000000000000,
  "metadata": {
    "created_by": "system",
    "logged_at": 1714000000000
  }
}

After Transform (Timezone: Asia/Kolkata, Format: ISO 8601):

{
  "order_id": "ORD-9821",
  "customer": "alice@example.com",
  "placed_at": "2024-04-25T13:56:40+05:30",
  "confirmed_at": "2024-04-25T14:56:40+05:30",
  "shipped_at": "2024-04-26T13:56:40+05:30",
  "metadata": {
    "created_by": "system",
    "logged_at": "2024-04-25T13:56:40+05:30"
  }
}

All four timestamp fields — across three different precisions, including the nested logged_at — converted in a single click.

That would have taken eight tab-switches and five minutes manually. It took one second here.

Other Features Worth Knowing

600+ Timezones Search and select any IANA timezone. UTC, Asia/Kolkata, America/New_York, Europe/London, and hundreds more.

Flexible Output Formats Choose from four presets:

• Default — 2024-04-25 08:26:40 UTC
• ISO 8601 — 2024-04-25T08:26:40Z
• US — 04/25/2024 08:26 AM UTC
• EU — 25-04-2024 08:26:40

Quick Single Converter Need to convert just one value fast? Paste any epoch into the quick converter bar. It instantly shows UTC, local time, ISO, RFC 2822, relative time (“5 days ago”), and all four precision representations side-by-side.

Diff Calculator Paste two epoch values and get the exact difference in milliseconds, seconds, minutes, hours, and days. Useful for measuring event durations, SLA windows, or session lengths directly from log data.

Who This Is For

If you’ve ever opened a new browser tab to convert an epoch timestamp while debugging — this is for you.

Specifically:

• Backend developers debugging API responses or tracing request flows
• Data engineers inspecting event streams, Kafka messages, or database exports
• QA engineers validating timestamps in JSON payloads against expected dates
• DevOps engineers reading structured logs from distributed systems with nanosecond-precision timestamps
• Anyone who has Googled “epoch to date” more than twice today

Under the Hood

Built with Java + Spring Boot on the backend, deployed on Google Cloud Run, and served globally through Cloudflare. Handles files up to 50MB without breaking a sweat.

Everything runs server-side — your JSON is processed and returned. Nothing is stored.

It’s Completely Free

No account. No API key. No rate limit. No watermark on the output.

Just the tool.

Try It

**jsonepochconverter.org**

If it saves you time, share it with your team — they’ve almost certainly hit the same problem.

Found a bug or want a feature? Open an issue on GitHub.

Tags: Developer Tools · JSON · API Development · Backend Development · Programming