What is process serving?

Process serving is the formal delivery of legal documents (a summons, a complaint, a subpoena, a notice) to a party in a court case. It is required by the U.S. Constitution’s due-process clause: a court can’t make decisions affecting someone unless they have notice and an opportunity to respond.

Short answer

A neutral third party hands the legal papers to the defendant (or, if they can’t be reached personally, leaves them with a competent adult at their home and follows up with a mailed copy). The server then signs a sworn declaration — the proof of service — which gets filed with the court so the case can move forward.

When it matters

Almost every civil case turns on it. If service is defective:

• A default judgment will be vacated when the defendant moves to set it aside
• A motion or order can’t be heard until service is fixed
• The case can be dismissed for lack of prosecution if you can’t complete service within the statutory window (typically 60-90 days)

Operational steps

1. File the complaint. The court issues a summons.
2. Hire a server. Sheriff, registered process server, or any 18+ adult who is not a party to the case (see [Who can serve papers](/guides/who-can-serve-papers)).
3. Server attempts personal service. Hands documents directly to the defendant.
4. Substituted service if needed. After diligent attempts at different times, the server leaves with a competent adult at the residence + mails a copy (see [California substitute service](/guides/california-substitute-service)).
5. Proof of service signed and filed. The server signs a sworn declaration; you file it with the court.

Common mistakes

• DIY service. Most states (including California, CCP §414.10) prohibit a party from serving their own papers.
• Skipping diligence. Going to substituted or posting after one attempt fails — the court will set service aside.
• Wrong agent for a corporate defendant. Corporations must be served on a registered agent or authorized officer (CCP §416.10) — not a random employee.
• Filing the wrong proof-of-service form. Personal service uses POS-040; mail uses POS-020; sub-service still uses POS-040 with an additional declaration.

What Servd does

We are an AI-assisted process serving platform. Upload the complaint, the AI extracts the parties + address, a CA-licensed server (or 50-state partner) attempts service, GPS-stamps each attempt, and a human reviewer signs off the proof of service before the server signs under CCP §2015.5. Court-ready PDF in your inbox; original mailed.

Related guides

• [California substitute service](/guides/california-substitute-service)
• [California proof of service](/guides/california-proof-of-service)
• [Who can serve papers](/guides/who-can-serve-papers)
• [What if a defendant avoids service?](/guides/defendant-avoids-service)

This is not legal advice; consult an attorney for case-specific guidance.